It seems that the sql syntax for Oracle case when is not implemented as I got error with query using this syntax (and not under sqldeveloper). Also the trick with CASE and any aggregate is to reverse them SELECT SUM ( CASE WHEN ConditionHERE = true THEN ELSE END) . TMP_MATCH_A ma, T_CABLO_CUSTOMER_CONTRAT ccc where ma. The CASE expression enables many forms of conditional processing to be placed into a SQL statement. By using CASE , more logic can be placed into SQL.
See how easily you can learn how to use CASE WHEN with SUM by practising SQL queries online. Join over 0users who finished Vertabelo Academy . The expression v is evaluated and matched for equality against each . WHEN t THEN r ELSE r END. CASE query with WHEN THEN for execution of statement matching to data or condition.
While some RDBMS also offer an IF expression, or a DECODE function, you can always rely on the two . La expresión CASE en SQL Server es comúnmente utilizado para la comparación de valores para asignar otra, mediante when y then.
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