Web Reference: 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: 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. Show you how to apply the PostgreSQL NULLIF function to substitute the null values for displaying data and preventing division by zero error.
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