Db2 11 Db2 SQL CASE expressions IBM
NULL cannot be specified for every case All result expression s must have compatible data types The attributes of the result are determined according to the rules that are described in Rules for result data types When the result is a string its attributes include a CCSID
Db2 11 Db2 SQL CASE statement IBM, The CASE statement selects an execution path based on multiple conditions A CASE statement operates in the same way as a CASE expression Syntax label CASE simple when clause searched when clause else clause END CASE simple when clause expression WHEN expression THEN SQL procedure statement searched when clause
Db2 CASE Expressions Adding If Else Logic to Queries in Db2 DB2 Tutorial
Here is the partial output In this example we used the simple CASE expression to make the note columm with the following logic If a book has one author the CASE expression returns Single Author If a book has two authors the CASE expression returns Two Authors
CASE statement IBM, Statement Expressions The CASE statement selects an execution path based on multiple conditions This statement should not be confused with the CASE expression which allows an expression to be selected based on the evaluation of one or more conditions
Sql server Nested case statements vs multiple criteria case
Sql server Nested case statements vs multiple criteria case , Had an interesting discussion with a colleague today over optimizing case statements and whether it s better to leave a case statement which has overlapping criteria as individual when clauses or make a nested case statement for each of the overlapping statements As an example say we had a table with 2 integer fields column a and column b
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SQL CASE Statement Explained with Examples Database Star
SQL CASE Statement Explained with Examples Database Star Last updated June 2 2023 The SQL CASE statement allows you to perform IF THEN ELSE functionality within an SQL statement Learn more about this powerful statement in this article This article applies to Oracle SQL Server MySQL and PostgreSQL What Does the SQL CASE Statement Do SQL CASE Statement Syntax Parameters of the CASE Statement
Chapter 5 SQL Case Statement Expression With Examples WHEN THEN ELSE
The following CASE expressions are the same SELECT LASTNAME CASE WHEN LASTNAME Haas THEN President SELECT LASTNAME CASE LASTNAME WHEN Haas THEN President There are two scalar functions NULLIF and COALESCE that are specialized to handle a subset of the functionality provided by CASE CASE expression IBM. 2 Answers Sorted by 5 It s not a cut and paste The CASE expression must return a value and you are returning a string containing SQL which is technically a value but of a wrong type This is what you wanted to write I think SELECT FROM Purchasing The CASE statement goes through conditions and returns a value when the first condition is met like an COBOL Evaluate statement So If a condition is true it will stop reading and return the result If no conditions are true it returns the value in the ELSE clause
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