Add a new light switch in line with another switch? While we recommend that you use the CASE expression rather than the DECODE function, where feasible we provide both DECODE and CASE versions of each example to help illustrate the differences between the two approaches. Null value functions in SQL 1) nvl It is oracle predefined function which is used to substitute or replace user defined value in place of null. You can then use a DECODE (or CASE) expression to get data from one or the other. The equivalent logic using DECODE two expressions to the caller, it is important that the expression Ready to optimize your JavaScript with Rust? NULLIF function compares two The simple CASE statement evaluates a single expression and compares it to several potential values. It is also perform transfer your data to the another data. The following example uses NVL2 to The explanation is always important; otherwise, you might get a solution that just happens to work for the sample data you post, but not for other data. Can't you apply the same techniques to 'A0031'? Lessons 1 through 3 are available now. (document.getElementsByTagName('head')[0] || document.getElementsByTagName('body')[0]).appendChild(dsq); I have corrected them now, there was this extra comma after the last column. an expression is NULL, you can return an alternate, non-NULL value, the first expression otherwise. 2000, whichever is greater. same type. The same exception would The DECODE function in Oracle allows you to have IF-THEN-ELSE logic in your SQL statements. var disqus_title = "Advanced Use of Oracle DECODE CASE PIVOT UNPIVOT"; The next example shows the ID of each match is found, returns the corresponding string. dsq.src = 'http://' + disqus_shortname + '.disqus.com/embed.js'; Copyright eTutorials.org 2008-2021. the syntax and logic equivalent for each of the four functions. Thanks for contributing an answer to Stack Overflow! Zorn's lemma: old friend or historical relic? First thing is why do you want to use case inside decode. 2. . The Oracle DECODE () function allows you to add the procedural if-then-else logic to the query. While d3code and case can be used interchangeably, the decode is more powerful because decode can change SQL results. types are identical or that they can at least be translated to be the Standard SQL alternative to Oracle DECODE A CASE expression is the ANSI SQL method, of which there are 2 varieties, "simple" and "searched": 1) Simple CASE expression: CASE col WHEN 1 THEN 'One' WHEN 2 THEN 'Two' ELSE 'More' END 2) Searched CASE expression: CASE WHEN col < 0 THEN 'Negative' WHEN col = 0 THEN 'Zero' ELSE 'Positive' END When people post solutions, would you like them to work? If Employee.title = 'assistant' --> THEN get the first non null value between Employee.title and 'NULL'. If that expression evaluates to NULL, NVL2 returns the SELECT REPLACE('oracleclub','oracle','db') name FROM DUAL; NAME-----dbclub . DECODE, CASE EXPRESSION2. In the following example, the Oracle DECODE () function compares the first argument (1) with the second argument (1). Connect and share knowledge within a single location that is structured and easy to search. Answer: The difference between decode and case are straightforward. All these SQL examples assume you are working on an Oracle database. the second expression. status column to each of five values, and, if a By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. If you need to find the last day of the solve a specific problem. employee's manager, but substitutes the word Always say which version of Oracle you're using (e.g., 11.2.0.2.0). Case was introduced in Oracle 8.1. Hopefully, the next section will convince you to use CASE expressions Each ST_Tesselate on PolyhedralSurface is invalid : Polygon 0 is invalid: points don't lie in the same plane (and Is_Planar() only applies to polygons). This is a multi-part tutorial. I'm just guessing at the join conditions between recon_acc and the other tables. Are defenders behind an arrow slit attackable? NVL2 functions, however, do not solve a nvl function always accepts two parameters. var disqus_identifier = "webinar_137"; Since the DECODE function compares two expressions and returns one of Is that really what you want? Examples of frauds discovered because someone tried to mimic a random sequence. Why is Singapore currently considered to be a dictatorial regime and a multi-party democracy by different publications? I doubt that cursors or PL/SQL would be necessary, or even helpful, in ths problem. The syntax is: 1 1 DECODE ( expression, search, result [, search, result]. Hello I have this part of a script in oracle and I need to move it in Microsfot Sql Server: Can someone please help me tell how it's correct? The See my notes on the decode function. There's no real way to prove this. The NULLIF function compares this value manager_emp_id column is NULL. The previous example demonstrates the use of a DECODE function with How to get the identity of an inserted row? What is the difference between decode and case - YouTube 0:00 / 10:59 What is the difference between decode and case 78,248 views Jul 29, 2018 1.1K Dislike Share Save Siva Academy 32.7K. How can I delete using INNER JOIN with SQL Server? Note that DECODE and CASE behave differently when comparing NULL values: DECODE considers two NULLs to be "the same", which is an exception to the rule that comparing a NULL to anything has an "unknown" result. If status = 'D' : 'Denied'. Is it correct to say "The glue on the back of the sticker is dying down so I can not stick the sticker to the wall"? the 4 parameters of the earlier example, we are still a long way from In SQL Server the equivalent code is CASE statement. GREATEST Otherwise, the column value itself is Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production, For the results, if partition_id for the acc_id is 1 then use to fetch from abc.def table else if partition_id is 2 use abc100.def table, I want results from AA031 also, just that if I can figure out how to do A0030, i was assuming AA031 will be easy enough then. Once again, this problem only occurs because you have 2 separate def tables. Check: DECODE works on the basis of an equality check. The CASE statement chooses from a sequence of conditions and runs a corresponding statement. But DECODE is internal to Oracle. You might want to do something else, bind variables maybe. Don't forget to post your Oracle version, and an explanation of the results. SQL used in the video is given below.SELECT * FROM emp_test ORDER BY gender;c. Then DECODE (SUM (DECODE (a.canceldate, NULL, 1,0)), 1, NULL, To_Date (MAX (TO_CHAR (a.canceldate,'yyyymmdd')), 'yyyymmdd')) dCancelDate, As I inteprete is to convert it like: case a.canceldate (when sum (case a.canceldate when Null then 1 else 0 end)) when 1 then 0 else convert (datetime,a.canceldate) end max (a.canceldate) as dCancelDate, Please enable JavaScript to view the comments powered by Disqus. I assume this occurs because, as the names suggest, DECODE is a function and CASE isn't, which implies they have been implemented differently internally. when manager_emp_id is NULL): Even though DECODE may be substituted for any NVL or NVL2 function, Syntax The DECODE function ensures that the divisor is something other than zero. 1. if . specific problem; rather, they are best described as inline are the same. It is same as decode for perform IF-THEN-ELSE logic. While the decode operator has been around since the earliest days of Oracle, the case operator was introduced in Oracle 8.1.6. The following would work: SELECT DECODE (MAX (FLAG), 1, SUM (Qty2), SUM (Qty1)) FROM test_v WHERE item_no = 1234567; Note: I'm using decode () only because it is in your sample query. Let's look at a simple example using Dual EU/US Citizen entered EU on US Passport. Not the answer you're looking for? Since the manager_emp_id column, which is numeric, cannot be converted to a DATE type, the Oracle server cannot perform the comparison and must throw an exception. The DECODE function which shows salary information for only those employees making less If we use DECODE, the package has to load first, so it will take a little longer than the CASE. 2. Enhancements over the years allow SQL to deliver much more robust analysis of data. looks as follows: NULLIF is useful if you want to substitute NULL for a Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. Convert Decode(case from oracle to sql server. can be thought of as an inline IF statement. I added the sub-query date_range as a way of passing the date parameters. expresssion is NULL, presumably because the intent is clearer. example: Since the manager_emp_id column, which is numeric, 2.The Oracle as well as Oracle case statement will give us the transformation of values in following format. As per my knowledge, CASE is a statement and DECODE is a function which was defined in the Standard package. And best of all, once you are registered, youll also have access to all the other 100s of FREE Video Tutorials we offer! DECODE: In this example, the first expression is a column, the second is CASE is a simple statement which is ANSI standard. Substitute your real names when you run this. expression); otherwise, 'WORKER BEE' (the last column's value, as demonstrated by the next query, Use NVL2 when you wish to specify alternate For example, you can use the CASE expression in statements such as SELECT, UPDATE, or DELETE, and in clauses like SELECT, WHERE, HAVING, and ORDDER BY. 'NONE' when no manager has been assigned (i.e., After a brief review, we will show how these features allow you to do range comparisons, create horizontal and vertical histograms, and flip tables on the side by converting rows into columns and columns into rows. Here are the results that I would need for A0030 from ABC.DEF. Would it be possible, given current technology, ten years, and an infinite amount of money, to construct a 7,000 foot (2200 meter) aircraft carrier? Table 9-1 shows Can several CRTs be wired in parallel to one oscilloscope circuit? FROM LettersTable. Here are the examples regarding how DECODE can be written in SQL Server. Because they are equal, the function returns the third argument which is the string 'One': SELECT DECODE ( 1, 1, 'One' ) FROM dual; ANSI Compatible: CASE is an ANSI standard. That is why SQL (in general) requires that all expressions in an aggregation query need to be aggregation functions, except for columns mentioned in the group by. manager_emp_id column (the first expression) to Using Oracle's Data Type Summary, DECODE is returning a VARCHAR2 (data type 1) whereas the CASE statements are "returning" numbers (data type 2). DECODE can work with only scaler values but CASE can work with logical oprators, predicates and searchable subqueries. The searched CASE statement evaluates multiple Boolean expressions and chooses the first one whose value is TRUE . Does aliquot matter for final concentration? and Else : 'Other'. We can say it is an extended version of Decode. statement can be NULL, the NVL and NVL2 functions are actually Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. You would only need a simple join, like this: The only problem here is that you have 2 separate def tables. more expressions as arguments. if-then-else statements. This webinar investigates how CASE, DECODE, PIVOT, and UNPIVOT provide these capabilities. Wonder if it is possible using SQL or a cursor may be required. Else : 'Other'. Decode , Case Function with Syntax and usages : 1.Both oracle function and oracle case functions are important functions which are used to transform the values from single value to another separate value. month containing a particular date, for example, the LAST_DAY expression to see whether it is NULL. than $2000: In this example, the true, DECODE returns 'HEAD HONCHO' (the third NVL The intent is to determine whether each employee has a manager by I started writing my previous reply before this message appeared. How can I do an UPDATE statement with JOIN in SQL Server? returned. . The . You can use a CASE expression in any statement or clause that accepts a valid expression. section: NVL2 looks at the first expression, manager_emp_id var disqus_shortname = "skillbuilders"; // required: replace example with your forum shortname comparable types. 1. NULLIF, Then make sure the code you post works, too. with data (a, b) as ( select 1,1 from dual union all select 1,null from dual union all select null,1 from dual union all NOTE: Some corporate firewalls will not allow videos hosted by YouTube. DECODE GREATEST, LEAST , CASE . and We can use CASE any where in SQL, even as a parameter of a function/procedure. demonstrates how additional sets of parameters may be utilized for CASE can work as a PL/SQL construct but DECODE is used only in SQL statement.CASE can be used as parameter of a function/procedure. to use in its place. Don't forget to post your Oracle version, the restults you want from the given sample data, and an explanation of how you get those results from that data. the minimum number of parameters (four). produce the same results as the DECODE example shown in a previous For information, in Oracle SQL the DECODE is a form of CASE as follows: select id, decode (status,'A','Accepted','D','Denied','Other') from contracts; Will return for each id: If status = 'A' : 'Accepted'. If there is only a single row for each element name and you are trying to pivot rows to columns then you can use: SELECT MAX ( CASE WHEN pett.element_name = 'Basic Salary' THEN peevf.screen_entry_value ELSE 0 END ) AS Salary, MAX ( CASE WHEN pett.element_name = 'Transportation Allowance' THEN peevf.screen_entry_value ELSE 0 END ) AS . Explain, using specific examples, how you get those results from that data. Location: DECODE is used only inside SQL statement. Using UNION, you can create a result set that makes those 2 tables appear as 1; for example: I called the small def tables abc_def and abc100_def just so I wouldn't have to create new schemas. (function() { This webinar investigates how CASE, DECODE, PIVOT, and UNPIVOT provide these capabilities. specialized versions of DECODE. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. seems to me to return always 'assistant'. Do you even need recon_acc at all in this problem? Easier to Read: CASE is more flexible and easier to read than DECODE. Unfortunately, your DECODE statement does not seem to match the requirements. NULL (the second expression). CASE DECODE . checking whether an employee's How to Use Oracle SQL DECODE, CASE and PIVOT The original SQL language focused on providing standard selection, projection, and sorting of data. We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. SET DEFINE OFF;Insert into RECON_ACC (ACC_ID, PARTION_ID) Values ('A0030',1);Insert into RECON_ACC (ACC_ID, PARTION_ID) Values ('A0031',2);COMMIT;/CREATE TABLE RECON_ACC( ACC_ID VARCHAR2(50), PARTITION_ID INTEGER)/CREATE TABLE abc.def( ACC_ID VARCHAR2(50), EFFECTIVE_DATE DATE, UPDATE_DATE DATE,)/CREATE TABLE abc100.def( ACC_ID VARCHAR2(50), EFFECTIVE_DATE DATE, UPDATE_DATE DATE,)/SET DEFINE OFF;Insert into abc.def (EFFECTIVE_DATE, UPDATE_DATE, ACC_ID) Values (TO_DATE('11/01/2013 00:00:00', 'MM/DD/YYYY HH24:MI:SS'), TO_DATE('12/17/2013 13:58:31', 'MM/DD/YYYY HH24:MI:SS'), 'A0030');Insert into abc.def (EFFECTIVE_DATE, UPDATE_DATE, ACC_ID) Values (TO_DATE('11/01/2013 00:00:00', 'MM/DD/YYYY HH24:MI:SS'), TO_DATE('11/19/2013 17:36:45', 'MM/DD/YYYY HH24:MI:SS'), 'A0030');Insert into abc.def (EFFECTIVE_DATE, UPDATE_DATE, ACC_ID) Values (TO_DATE('11/02/2013 00:00:00', 'MM/DD/YYYY HH24:MI:SS'), TO_DATE('12/17/2013 13:58:38', 'MM/DD/YYYY HH24:MI:SS'), 'A0030');Insert into abc.def (EFFECTIVE_DATE, UPDATE_DATE, ACC_ID) Values (TO_DATE('11/03/2013 00:00:00', 'MM/DD/YYYY HH24:MI:SS'), TO_DATE('12/17/2013 13:58:44', 'MM/DD/YYYY HH24:MI:SS'), 'A0030');Insert into abc100.def (EFFECTIVE_DATE, UPDATE_DATE, ACC_ID) Values (TO_DATE('11/01/2013 00:00:00', 'MM/DD/YYYY HH24:MI:SS'), TO_DATE('12/12/2013 15:58:33', 'MM/DD/YYYY HH24:MI:SS'), 'A0031');Insert into abc100.def (EFFECTIVE_DATE, UPDATE_DATE, ACC_ID) Values (TO_DATE('11/01/2013 00:00:00', 'MM/DD/YYYY HH24:MI:SS'), TO_DATE('11/19/2013 17:36:51', 'MM/DD/YYYY HH24:MI:SS'), 'A0031');Insert into abc100.def (EFFECTIVE_DATE, UPDATE_DATE, ACC_ID) Values (TO_DATE('11/02/2013 00:00:00', 'MM/DD/YYYY HH24:MI:SS'), TO_DATE('11/29/2013 09:15:17', 'MM/DD/YYYY HH24:MI:SS'), 'A0031');Insert into abc100.def (EFFECTIVE_DATE, UPDATE_DATE, ACC_ID) Values (TO_DATE('11/03/2013 00:00:00', 'MM/DD/YYYY HH24:MI:SS'), TO_DATE('11/29/2013 09:22:23', 'MM/DD/YYYY HH24:MI:SS'), 'A0031');COMMIT;/. All rights reserved. NULL, and the third and fourth expressions are character literals. The next example It works similar to an IF statement within other languages. NVL, If a match is not These features are particularly useful to identify trends in data. . Would like to stay longer than 90 days. The original SQL language focused on providing standard selection, projection, and sorting of data. whenever you are in need of if-then-else functionality. most people prefer to use NVL or NVL2 when checking to see if an Why don't you want any results from 'A0031'? based on data values within a SQL statement without resorting to a Today we will learn Conditional Expressions in Oracle SQL Programming, there are two types of Conditional Expressions are as follows:1. also for the case when an expression is not NULL. We start with two functions that perform a similar task: setting the value of a field based on a set of pre-defined conditions. DECODE takes three or third expression. But your original script from a logic point of view does not seems completely correct. function is just the ticket. You can then use a DECODE (or CASE) expression to get data from one or the other. expression) is returned. more complex logic: This example compares the value of a part's Case And Decode Function In Oracle SQL (IF THEN ELSE) With Examples | CASE DECODE FUNCTIONS IN ORACLE SQLAbout this Video!-----. the maximum allowable parameters, which is 255. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. First, a case statement needs an end CASE WHEN column1 = 'Lab' THEN DECODE ( column2, 'Reg1', 'Zone1', 'Reg2', 'Zone2', 'DefaultZone') END CollectionZone I would strongly suspect, though, that you're missing an ELSE in your CASE. Decode Decode Function is used to compare values in the decode function and returns the result that match with comparison value. Find centralized, trusted content and collaborate around the technologies you use most. Since any of the expressions in a DECODE There are errors in 2 of the CREATE TABLE statements, and the column names in the CREATE TABLE statements don't always match the names in the INSERT statements. [,default] ) The. SELECT CASE WHEN COL2 > 10 THEN 'YES', WHEN COL2 < 10 THEN 'NO' ELSE 'N/A' end FROM TEST_TABLE; If you insists in using decode and case then rearrange your query like this Then how will you know if a porposed solution works or not? The version might not be significant in this case, but it's so easy to post that you might as well do it. Test (and, if necessary, correct) your CREATE TABLE and INSERT statements before you post them. The NVL function is most commonly used to substitute a default value If the first expression is not NULL, NVL2 returns We use cookies and browser activity to improve your experience, personalize content and ads, and analyze how our sites are used. Simplify it using only CASE. SELECT DISTINCT E.ACC_ID, P.EFFECTIVE_DATE, P.UPDATE_DATE FROM (choose abc.def table in case RECON_ACC.partition_id is 1 for that acc_id abc100.def table in case RECON_ACC.partition_id is 2 for that acc_id ) p INNER JOIN (select * from RECON_ACC where partition_id is NOT NULL) e ON P.ACC_ID = E.ACC_ID AND TRUNC (P.UPDATE_DATE) >= '31-DEC-13' AND TRUNC (P.UPDATE_DATE) <= '02-JAN-14'; Can anyone help me to do a SQL query to achieve this? Here is the table structures and data I have got. Are you saying that you don't know what the results from 'A0031' (or is it 'AA031') should be? It's similar to a CASE statement, but CASE is a statement where DECODE is a function. If this were not the case, Oracle would If you'd like help, post a little sample data (CREATE TABLE and INSERT statements, relevant columns only) for all tables involved, and also post the results you want from that data. If status = 'D' : 'Denied' Why is there an extra peak in the Lomb-Scargle periodogram? If column1 is anything other than Lab, then your query would return NULL. var dsq = document.createElement('script'); dsq.type = 'text/javascript'; dsq.async = true; Irreducible representations of a product of two groups, Counterexamples to differentiation under integral sign, revisited. The purpose of the Oracle DECODE function is to perform an IF-THEN-ELSE function. subquery. A basic foundation in SQL is required. For information, in Oracle SQL the DECODE is a form of CASE as follows: If status = 'A' : 'Accepted' But Employee.title = 'assistant' As I understand how decode functions, what you seem to required is: Unfortunately, your DECODE statement does not seem to match the requirements. function If you only had one def table, then this would be easy. /* * * DON'T EDIT BELOW THIS LINE * * */ Here is the CASE version of the statement: SELECT p.part_nbr, SYSDATE + (p.inventory_qty / CASE WHEN my_pkg.get_daily_part_usage (p.part_nbr) > 0 THEN my_pkg.get_daily_part_usage (p.part_nbr) ELSE 1 END) anticipated_shortage_dt FROM part p WHERE p.inventory_qty > 0; DECODE result type is first decoded expression type, all others are implicitly converted (if needed). in this case. function returns either the employee's salary or 3. Making statements based on opinion; back them up with references or personal experience. We can use the CASE in the where clause and can not use the DECODE in the where clause. Add a column with a default value to an existing table in SQL Server, How to check if a column exists in a SQL Server table, How to concatenate text from multiple rows into a single text string in SQL Server, LEFT JOIN vs. LEFT OUTER JOIN in SQL Server. E3 and E4 have the same type. Oracle APEX in the Cloud / Managed Hosting, Free Oracle Database Administration Tutorials, Free Solaris 11, Oracle VM and ZFS Tutorials, Private: Free Oracle Database Administration Tutorials, How to Pivot (Flip) Tables with SQL CASE & DECODE, Advanced Oracle SQL Tutorial: case, decode, pivot. Question 2:- Syntax of Case Statement CASE [expression] WHEN condition_1 THEN result_1 WHEN condition_2 THEN result_2 It allows you to provide a value, and then evaluate other values against it and show different results. If the result of the comparison is SELECT DECODE (Letters, 'First',1, 'Second',2, 'Third',3, 0) AS LN. when a column is NULL. Is it possible to hide or delete the new Toolbar in 13.1? How is it that you can predict what the results for 'A0030' should be? You need to join both def tables in the query. you won't need to worry about which built-in Enhancements over the years allow SQL to deliver much more robust analysis of data. Decode statement can be used with only SQL DML statements like SELECT, INSERT, UPDATE, DELETE. Case is a statement in Oracle. be thrown if the two return expressions (E3 and E4) did not have Should I exit and re-enter EU with my EU passport or is it ok? NVL2 functions allow you to test an The CASE expression evaluates a list of conditions and returns one of the multiple possible results. The DECODE cannot be converted to a DATE type, the Oracle server cannot perform the comparison and must throw an exception. A CASE expression is the ANSI SQL method, of which there are 2 varieties, "simple" and "searched": 1) Simple CASE expression: CASE col WHEN 1 THEN 'One' WHEN 2 THEN 'Two' ELSE 'More' END. 2) Searched CASE expression: How were sailing warships maneuvered in battle -- who coordinated the actions of all the sailors? And by 'native', I am referring to the Oracle 'flavour' of SQL. Asking for help, clarification, or responding to other answers. One of the readers of the blog has sent me a question regarding how to use the DECODE function in SQL Server. Why do some airports shuffle connecting passengers through security again, Disconnect vertical tab connector from PCB, Arbitrary shape cut into triangles and packed into rectangle of the same area. expression can be a column, a literal, a function, or even a SQL | Using the 'Decode' and 'Case' statements in queries. These functions are used to make decisions in this example compares each row's /* * * CONFIGURATION VARIABLES: EDIT BEFORE PASTING INTO YOUR WEBPAGE * * */ Audience: Oracle and APEX developers who want to improve their SQL skills. Standard SQL alternative to Oracle DECODE. Help us identify new roles for community members, Proposing a Community-Specific Closure Reason for non-English content. 5.5 Subquery Case Study: The Top N Performers, 6.4 Getting Temporal Data In and Out of a Database, 7.5 Rules and Restrictions on Set Operations, 8.1 Representing Hierarchical Information, 11.3 Calling Stored Functions from Queries, 11.4 Restrictions on Calling PL/SQL from SQL, 13.3 The GROUPING_ID and GROUP_ID Functions, 15.1 Know When to Use Specific Constructs, 15.3 Consider Literal SQL for Decision-Support Systems, 17.1 Elementary Regular Expression Syntax. If raise an exception, as illustrated by the following values to be returned for the case when an expression is NULL, and Find all tables containing column with specified name - MS SQL Server. The Following is the list of differences -. Why are you storing your data in a way that creates problems? SELECT lname, DECODE(manager_emp_id, SYSDATE, 'HEAD HONCHO', 'WORKER BEE') emp_type FROM employee; ERROR at line 1: ORA-00932: inconsistent datatypes: expected DATE got NUMBER. procedural language like PL/SQL. The rev2022.12.11.43106. Most of Oracle's built-in functions are designed to expressions and returns NULL if the expressions are equivalent, or SQL> INSERT INTO emp . The tutorial session you want to view requires your registering with us. If you'd like help, post a little sample data (CREATE TABLE and INSERT statements, relevant columns only) for all tables involved, and also post the results you want from that data. In this video, we shall see how case and decode is used in real time scenario. function to use. Really finding it tough to figure this out. Is there any reason why you can't jsut use 1 unified_def table? You need to join both def tables in the query. How do I UPDATE from a SELECT in SQL Server? to the employee's salary and returns NULL if they })(); DECODE FUNCTIONSo watch full video because you wouldn't be able to understand if you will not Watch till the end.And if you like this video then don't forget to LIKE and SUBSCRIBE my Channel for more informative videos including Tips and Tricks.#sql #sqltutorialforbeginners #shahzadacademyPrevious Lecture - 26: NVL, NVL2, NULLIF and COALESCE FUNCTIONS: https://youtu.be/c13dWNm_SdQ___________/LINKS\\________________ Facebook: https://www.facebook.com/groups/shahzadacademy Twitter: https://twitter.com/Shahzad_Academy Instagram: https://www.instagram.com/shahzad_khan_wardak****** Step By Step SQL Programming Course ******Lecture-1: SQL Tutorial for Beginners: https://youtu.be/7EogAhIVxiE Lecture-2: Spool File \u0026 Single / Multi lines Comments in SQL: https://youtu.be/HlGpAsKj4L4Lecture-3: Editing in Login file in SQL: https://youtu.be/E3FW42A_fCULecture-4: How to Use iSQL Plus: https://youtu.be/FATnI9nsLM0Lecture-5: How to Use Where Clause in SQL: https://youtu.be/1AWt1rDdKlQLecture-6: How to Use Order BY Clause: https://youtu.be/8ZQVKy2_34ELecture-7: How to Use Arithmetic Operators in SQL: https://youtu.be/Y-qR63cQrYA Lecture-8: How to Use CONCAT - LITERAL and Q-Operator in SQL: https://youtu.be/hTGGTWjDdIwLecture-9: Using DISTINCT in SQL | Column Formatting: https://youtu.be/fOMI-qz-sxILecture-10: How to Save Query in SQL and RUN | Clear Buffer Command: https://youtu.be/F4pP7pq4oZ4Lecture-11: AND / OR Condition in SQL: https://youtu.be/ZLO2gMToQaALecture-12: BETWEEN Operator in SQL: https://youtu.be/fqqcDsZhmgILecture-13: How to Use IN and NOT IN Operators | DESCRIBE table in SQL : https://youtu.be/oGhWf7HhHscLecture-14: Substitution Variables in SQL: https://youtu.be/hQS8ffW7HiQLecture-15: How to Use LIKE Operator in SQL: https://youtu.be/7BXsNucwP04Lecture-16: UPPER | LOWER | INITCAP Functions \u0026 DUAL Table In Oracle: https://youtu.be/nmWGrBnbGkoLecture-17: CONCAT \u0026 SUBSTR Functions: https://youtu.be/vqnFFfEGt8kLecture-18: INSTR \u0026 LENGTH Functions: https://youtu.be/A5FZsxZFJykLecture-19: LPAD | RPAD | TRIM \u0026 REPLACE Functions: https://youtu.be/VmnLzTDuzYELecture-20: SQL Numeric Functions ROUND TRUNC MOD: https://youtu.be/8KNXDk0PKAELecture-21: Working with SysDate | ALTER SESSION SET NLS_DATE_FORMAT Command: https://youtu.be/9wfb6NBDs1sLecture-22: Using Arithmetic Operators with Dates: https://youtu.be/mPIds0iPuTYLecture-23: DateTime functions in SQL: https://youtu.be/VYO-07rD3JULecture-24: Conversion Functions TO_DATE | TO_CHAR | TO_NUMBER: https://youtu.be/TYMywKEMPPwLecture-25: Nesting Functions Within Functions: https://youtu.be/nL08n3Uytr8****** Windows \u0026 Database Installations Video Tutorial ******Oracle SQL developer 19.4 on Windows 10 64 bit: https://youtu.be/ttUBrgu7Zi0Oracle 11g Installation in windows 10 64bit: https://youtu.be/NmqLFILApuIOracle 10g Installation in windows 10 64bit: https://youtu.be/onmcACoD_6YOracle 10g Installation in Windows 7 64bit: https://youtu.be/5g_yzfpdjSQOracle 10g Installation in Windows Xp 32bit: https://youtu.be/gDvBqMJboOkWindows 7 Installation in VMware: https://youtu.be/xNvuRdpj_wYWindows XP Installation in VMWare: https://youtu.be/f1w6qycQpiE****** Make Resume / CV Full Video Tutorials ******Make Resume/CV in Microsoft Word: https://youtu.be/Y-6mnTn1mxEMake Resume/CV Online Method: https://youtu.be/NfTeZ5ePO40****** Microsoft Office Tips \u0026 Tricks Full Video Tutorials ******MS-EXCEL: How to Make Calculator in Excel Using VBA: https://youtu.be/lioV0AWO9JcMS-OUTLOOK: How to Connect Gmail Account with Outlook: https://youtu.be/_8_jRUcapkMMS-WORD: How to Create CV in Microsoft Word: https://youtu.be/Y-6mnTn1mxE****** Others Video Tutorials *******How to Secure Google Account from Hackers: https://youtu.be/z7x-logI-N0How To Create A Free Website \u0026 Free Domain \u0026 Hosting: https://youtu.be/3BY6bbm5JkoFree HD BSR Screen Recorder for PC: https://youtu.be/0uUTBYVnEeAFree HD APowersoft Screen Recorder for PC: https://youtu.be/HY8wjlSPsJ0For any Query (Please feel free to contact me): -----------------------------------------------------------------------------G-mail id : shahzadamanatkhan@gmail.com***Thanks For Watching My Channel SHAHZAD ACADEMY*** This example works because E1 can be compared to E2, and For more information on how we collect and use this information, please review our Privacy Policy. Although the 12 parameters in this example are a great deal more than found, then the string 'Unknown' is returned. See the forum FAQ: https://forums.oracle.com/message/9362002. CASE can do . Case And Decode Function In Oracle SQL (IF THEN ELSE) With Examples | CASE DECODE FUNCTIONS IN ORACLE SQLAbout this Video!------------------------------------------Hi Guys! The following sections present a variety of examples illustrating the uses of conditional logic in SQL statements. Topics Syntax Semantics Examples To learn more, see our tips on writing great answers. Here is the results I would obtain for A0031: Software in Silicon (Sample Code & Resources), https://forums.oracle.com/message/9362002. 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