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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'.
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 END)
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.
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.
A CASE expression allows you to select an expression based on evaluation of one or more conditions. In other words, it allows you to add the if-else logic to your queries. Db2 supports two kinds of CASE expressions: simple CASE and searched CASE expressions.
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.
