PostgreSQL: Documentation: 11: 38.5. Query Language (SQL) Functions

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38.5. Query Language (SQL) Functions
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38.5. Query Language (SQL) Functions

38.5.1. Arguments for SQL Functions
38.5.2. SQL Functions on Base Types
38.5.3. SQL Functions on Composite Types
38.5.4. SQL Functions with Output Parameters
38.5.5. SQL Functions with Variable Numbers of Arguments
38.5.6. SQL Functions with Default Values for Arguments
38.5.7. SQL Functions as Table Sources
38.5.8. SQL Functions Returning Sets