Enum Functions

For enum types (described in Section 8.7), there are several functions that allow cleaner programming

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Comparisons

The usual comparison operators are available, as shown in Table 9-1. Table 9-1. Comparison Operators

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Conditional Expressions

This section describes the SQL-compliant conditional expressions available in PostgreSQL.

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Pattern Matching

There are three separate approaches to pattern matching provided by PostgreSQL: the traditional SQL

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Logical Operators

The usual logical operators are available: AND OR

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Array Comparisons

This section describes several specialized constructs for making multiple comparisons between groups of values. These forms are syntactically related to the subquery forms

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Sequence Functions

This section describes functions for operating on sequence objects, also called sequence generators or just sequences. Sequence objects are special

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Set Returning Functions

This section describes functions that possibly return more than one row. The most widely used functions in this class are series generating functions, as detailed in Table

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Subquery Expressions

This section describes the SQL-compliant subquery expressions available in PostgreSQL. All of the expression

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