![]() The supported syntax is: COALESCE(value_1,value_2,value_3.value_n) If all the arguments are NULL then it will return NULL as its output. The COALESCE function returns the first non-NULL expression in the specified list. NULLIF, GREATEST, LEAST, and COALESCE are the types of conditional expressions in PostgreSQL. What is a COALESCE Function?ĬOALESCE is a system in-built function that can be considered one of the conditional expressions available in PostgreSQL. In this post, we are going to understand what the COALESCE function is and how to use it in PostgreSQL. ![]() ![]() ![]() SUMMARY: This article reviews methods for handling NULL values in PostgreSQL using the COALESCE function.
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