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3 lis 2018 · I have use case where I need to write a query which contains case statement in where clause with conditions like below : I have column in 'SAMPLE_TABLE' called 'BIRTHDATE' 1) if only from date (which is a param i.e., :from) is given, then I need to get the records from SAMPLE_TABLE whose BIRTHDATE >= :from 2) if only to date (which is a param i.e.
24 cze 2019 · If you need to refer to the CASE expression in the WHERE clause, then you have two choices. First, you may subquery your current query, and assign an alias to the CASE expression: SELECT * FROM ( SELECT CASE WHEN ... AS exp FROM TB1 ... ) t WHERE exp = ... Or, you may avoid the subquery and just repeat the entire CASE expression in the WHERE ...
CASE WHEN c1=var1 OR (c1 IS NULL AND var1 IS NULL) THEN 'a' WHEN c1=var2 OR (c1 IS NULL AND var2 IS NULL) THEN 'b' ELSE NULL END. DECODE (c1,var1, 'a', var2, 'b') CASE expressions allow an expression to be selected based on the evaluation of one or more conditions.
It specifies the result of a searched-when-clause or a simple-when-clause that is true, or the result if no case is true. There must be at least one result-expression in the CASE expression with a defined data type.
Db2 supports two kinds of CASE expressions: simple CASE and searched CASE expressions. Both simple and searched CASE are expressions, therefore, you can use them in any clause that accepts an expression such as SELECT, WHERE, GROUP BY, and HAVING clauses.
CASE statement. 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.
26 cze 2023 · The CASE statement in the WHERE clause can conditionally filter rows based on defined criteria. The syntax for the CASE statement in the WHERE clause is shown below. The CASE expression matches the condition and returns the value of the first THEN clause. If none of the conditions are true, it returns the value of the ELSE clause.
