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There are two scalar functions, NULLIF and COALESCE, that are specialized to handle a subset of the functionality provided by CASE. Table 1 shows the equivalent expressions using CASE or these functions. Table 1. Equivalent CASE Expressions. WHEN e1=e2 THEN NULL.
- Db2 12 - Db2 SQL - CASE statement - IBM
The CASE statement selects an execution path based on the...
- Db2 12 - Db2 SQL - CASE expressions - IBM
Use a CASE expression to list the full name of the division...
- Db2 12 - Db2 SQL - CASE statement - IBM
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.
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.
Use a CASE expression to list the full name of the division to which each employee belongs. SELECT EMPNO, LASTNAME, CASE SUBSTR(WORKDEPT,1,1) WHEN 'A' THEN 'Administration' WHEN 'B' THEN 'Human Resources' WHEN 'C' THEN 'Design' WHEN 'D' THEN 'Operations' END FROM EMPLOYEE;
28 sie 2014 · 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 end), . . . from mytable; Share Improve this answer
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.
6 mar 2023 · In this article, we will study the general syntax of the simple case statement and searched case statement and we will also study the implementation of this statements along with the examples in DB2 database management system.
