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NULL predicate

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

In SQL, you cannot compare NULL with any value using comparison predicates, as the result would yield NULL again, which is neither TRUE nor FALSE (see also the manual's section about conditional expressions). In order to test a column expression for NULL, use the NULL predicate as such:

TITLE IS NULL
TITLE IS NOT NULL
BOOK.TITLE.isNull()
BOOK.TITLE.isNotNull()

Dialect support

This example using jOOQ:

BOOK.TITLE.isNull()

Translates to the following dialect specific expressions:

-- All dialects
BOOK.TITLE IS NULL

(These are currently generated with jOOQ 3.16, see #10141), or translate your own on our website

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