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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 ...
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).
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.
Example 1 (simple-when-clause): Assume that in the EMPLOYEE table the first character of a department number represents the division in the organization. Use a CASE expression to list the full name of the division to which each employee belongs.
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.
Example 1: The following example shows how to do this using the syntax for a simple-case-statement-when-clause: CASE v_workdept WHEN 'A00' THEN UPDATE department SET deptname = 'DATA ACCESS 1'; WHEN 'B01' THEN UPDATE department SET deptname = 'DATA ACCESS 2'; ELSE UPDATE department SET deptname = 'DATA ACCESS 3'; END CASE
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.
