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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.
- Db2 12 - Db2 SQL - CASE expressions - IBM
searched-when-clause. Specifies a search-condition that is...
- Db2 12 - Db2 SQL - CASE statement - IBM
Use a searched case statement WHEN clause to update column...
- Db2 12 - Db2 SQL - CASE expressions - IBM
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.
searched-when-clause. Specifies a search-condition that is applied to each row or group of table data presented for evaluation, and the result when that condition is true. Pair-wise comparison is performed. Implicit cast of each pair follows the same rule as for a basic predicate.
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.
Use a searched case statement WHEN clause to update column DEPTNAME in table DEPT, depending on the value of SQL variable . The CASE statement selects an execution path based on the evaluation of one or more conditions. A CASE statement operates in the same way as a CASE expression.
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.
The CASE statement selects an execution path based on multiple conditions. A CASE statement operates in the same way as a CASE expression.
