|The jOOQ User Manual : SQL building : Column expressions : General functions : DECODE||previous : next|
This documentation is for the unreleased development version of jOOQ. Click on the above version links to get this documentation for a supported version of jOOQ.
Applies to ✅ Open Source Edition ✅ Express Edition ✅ Professional Edition ✅ Enterprise Edition
Some SQL dialects, including Db2, H2, Oracle know a more succinct, but maybe less readable
DECODE() function with a variable number of arguments. This function works like a
NULL safe CASE expression. jOOQ supports the
DECODE() function and emulates it using
CASE expressions in all dialects that do not have native support:
SELECT -- Oracle: DECODE(FIRST_NAME, 'Paulo', 'brazilian', 'George', 'english', 'unknown'), -- Other SQL dialects CASE WHEN FIRST_NAME IS NOT DISTINCT FROM 'Paulo' THEN 'brazilian' WHEN FIRST_NAME IS NOT DISTINCT FROM 'George' THEN 'english' ELSE 'unknown' END FROM AUTHOR
// Use the Oracle-style DECODE() function with jOOQ. // Note, that you will not be able to rely on type-safety decode( AUTHOR.FIRST_NAME, "Paulo", "brazilian", "George", "english", "unknown" );
See the DISTINCT predicate for details about the
NULL safe semantics.