2.7. Aggregate Functions # Like most other relational database products, PostgreSQL supports aggregate functions. An aggregate function computes a single result …| PostgreSQL Documentation
9.15. XML Functions # 9.15.1. Producing XML Content 9.15.2. XML Predicates 9.15.3. Processing XML 9.15.4. Mapping Tables to XML The functions …| PostgreSQL Documentation
9.22. Window Functions # Window functions provide the ability to perform calculations across sets of rows that are related to the …| PostgreSQL Documentation
4.2. Value Expressions # 4.2.1. Column References 4.2.2. Positional Parameters 4.2.3. Subscripts 4.2.4. Field Selection 4.2.5. Operator Invocations 4.2.6. Function Calls …| PostgreSQL Documentation
9.21. Aggregate Functions # Aggregate functions compute a single result from a set of input values. The built-in general-purpose aggregate functions …| PostgreSQL Documentation
7.2. Table Expressions # 7.2.1. The FROM Clause 7.2.2. The WHERE Clause 7.2.3. The GROUP BY and HAVING Clauses 7.2.4. GROUPING …| PostgreSQL Documentation