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User-Defined Functions (UDFs)
Last Updated: April 9, 2026
Ashish Pratap Singh
10 min read
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Sample Data
What Is a User-Defined Function?
Scalar Functions in PostgreSQL
Deterministic vs Non-Deterministic Functions
Table-Valued Functions
Scalar UDFs and the Optimizer Fence Problem
UDFs vs Views vs CTEs
Syntax in Other Dialects
Overloading and Default Arguments
Production Realities
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