Available in versions: Dev (3.18) | Latest (3.17)

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.

Repeated NOT

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

The NOT unary operator reverses itself, when called repeatedly, meaning that redundant NOT operators can be removed.

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

-- With Settings.transformPatternsNotNot active, this:
SELECT
  NOT (NOT (x = 1)),
  NOT (NOT (NOT (x = 1)))
FROM tab;

-- ... is transformed into the equivalent expression:
SELECT
  x = 1,       -- NOT (NOT (x = 1))
  NOT (x = 1), -- NOT (NOT (NOT (x = 1)))
FROM tab;

Feedback

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

The jOOQ Logo