| The jOOQ User Manual : SQL building : Column expressions : General functions : DECODE | previous : next |
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DECODE
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.
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