Web Reference: Jul 15, 2025 · The PostgreSQL NULLIF function compares two expressions and returns NULL if they are equal; otherwise, it returns the first expression. This function is particularly useful for handling conditional NULLs and avoiding divide-by-zero errors in SQL queries. Feb 26, 2026 · The NULLIF function returns a null value if value1 equals value2; otherwise it returns value1. This can be used to perform the inverse operation of the COALESCE example given above: Dec 27, 2023 · Fortunately, PostgreSQL includes a very handy conditional function called NULLIF. Mastering NULLIF helps you simplify null checking and prevent nasty errors. In this comprehensive guide, I’ll share everything I’ve learned from 10+ years as a PostgreSQL specialist about effectively using NULLIF:
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