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28 sie 2014 · Heres what I'm trying to do: select. case. when someid = 1 then date_1. when someid = 2 then date_2. when someid = 3 then date_3. when someid = 4 then date_4. ,case. when someid = 1 then xdate_1.
24 cze 2019 · You may use the following syntax trick: CASE WHEN 'Value' IN (TB1.ColumnX, TB1.ColumnY, TB1.ColumnZ) THEN Statement1 ELSE ' ' END AS MyColumn. The alternative to this would be to repeat the full equality check for each column: SELECT. CASE. WHEN TB1.ColumnX = 'Value' OR. TB1.ColumnY = 'Value' OR. TB1.ColumnZ = 'Value'.
If the CASE expression is in a VALUES clause, an IN predicate, a GROUP BY clause, or an ORDER BY clause, the search-condition in a searched-when-clause cannot be a quantified predicate, IN predicate using a fullselect, or an EXISTS predicate (SQLSTATE 42625).
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.
If search-condition in a searched-when-clause specifies a quantified predicate or an IN predicate that includes a fullselect, the CASE expression cannot be used in the following contexts: select lists. a VALUES clause of an INSERT or MERGE statement. a SET or assignment clause of an UPDATE, MERGE, or DELETE statement.
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. Invocation. This statement can be embedded in: An SQL procedure definition.
DB2 - SQL Case Statement. 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.
