Search results
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 ...
3 lis 2018 · SELECT BIRTHDATE FROM SAMPLE_TABLE. WHERE. (CASE. WHEN (:from AND NOT :to) THEN BIRTHDATE >= :receivefrom. WHEN (:to AND NOT :from) THEN BIRTHDATE <= :to. WHEN (:to AND :from) THEN BIRTHDATE BETWEEN :from AND :to.
SELECT EMPNO, WORKDEPT, SALARY+COMM FROM EMPLOYEE WHERE (CASE WHEN SALARY=0 THEN NULL ELSE COMM/SALARY END) > 0.25; The following CASE expressions are the same: SELECT LASTNAME, CASE WHEN LASTNAME = 'Haas' THEN 'President' ... SELECT LASTNAME, CASE LASTNAME WHEN 'Haas' THEN 'President' ...
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.
Example 1: Use a simple case statement WHEN clause to update column DEPTNAME in table DEPT, depending on the value of SQL variable v_workdept. CASE v_workdept WHEN 'A00' THEN UPDATE DEPT SET DEPTNAME = 'DATA ACCESS 1'; WHEN 'B01' THEN UPDATE DEPT SET DEPTNAME = 'DATA ACCESS 2'; ELSE UPDATE DEPT SET DEPTNAME = 'DATA ACCESS 3'; END CASE
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.
