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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;
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' ...
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.
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.
The CASE statement selects an execution path based on multiple conditions. This statement should not be confused with the CASE expression, which allows an expression to be selected based on the evaluation of one or more conditions. Invocation. This statement can be embedded in: An SQL procedure definition. A compound SQL (compiled) statement.
1 sty 2018 · The WHERE clause specifies the search condition for the rows returned by the SELECT statement. The following shows the syntax of the WHERE clause in the SELECT statement: SELECT select_list FROM table_name WHERE search_condition ORDER BY sort_expression; Code language: SQL (Structured Query Language) ( sql )
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.
