Available in versions: Dev (3.18)

This is experimental functionality, and as such subject to change. Use at your own risk!

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.

DISTINCT FROM NULL

Applies to ✅ Open Source Edition   ✅ Express Edition   ✅ Professional Edition   ✅ Enterprise Edition

The DISTINCT predicate is a verbose way of NULL safe comparisons. If one of the operands is NULL, then it can be simplified to the NULL predicate.

Using Settings.transformPatternsDistinctFromNull, the following transformations can be achieved:

-- With Settings.transformPatternsDistinctFromNull active, this:
SELECT
  a IS NOT DISTINCT FROM NULL,
  a IS DISTINCT FROM NULL
FROM tab;

-- ... is transformed into the equivalent expression:
SELECT
  a IS NULL,
  a IS NOT NULL
FROM tab;

Feedback

Do you have any feedback about this page? We'd love to hear it!

The jOOQ Logo