PostgreSQL Documentation 16 43 3 Declarations
Nov 9 2023 nbsp 0183 32 PL pgSQL variables can have any SQL data type such as integer varchar and char Here are some examples of variable declarations user id integer quantity numeric 5 url varchar myrow tablename ROWTYPE myfield tablename columnname TYPE arow RECORD The general syntax of a variable
PostgreSQL Documentation 16 8 1 Numeric Types, Nov 9 2023 nbsp 0183 32 The data types real and double precision are inexact variable precision numeric types On all currently supported platforms these types are implementations of IEEE Standard 754 for Binary Floating Point Arithmetic single and double precision respectively to the extent that the underlying processor operating system and compiler
PostgreSQL Documentation 16 8 3 Character Types
Nov 9 2023 nbsp 0183 32 variable unlimited length Table 8 4 shows the general purpose character types available in PostgreSQL SQL defines two primary character types character varying n and character n where n is a positive integer Both of these types can store strings up to n characters not bytes in length
PL pgSQL Variables PostgreSQL Tutorial, A variable is always associated with a particular data type Before using a variable you must declare it in the declaration section of the PL pgSQL block The following illustrates the syntax of declaring a variable variable name data type expression Code language PostgreSQL SQL dialect and PL pgSQL pgsql In this syntax
PostgreSQL Documentation 16 38 13 User Defined Types
PostgreSQL Documentation 16 38 13 User Defined Types, Nov 9 2023 nbsp 0183 32 User Defined Types 38 13 1 TOAST Considerations As described in Section 38 2 PostgreSQL can be extended to support new data types This section describes how to define new base types which are data types defined below the level of the SQL language
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PostgreSQL Documentation 16 CREATE TYPE
PostgreSQL Documentation 16 CREATE TYPE Nov 9 2023 nbsp 0183 32 There are five forms of CREATE TYPE as shown in the syntax synopsis above They respectively create a composite type an enum type a range type a base type or a shell type The first four of these are discussed in turn below
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PostgreSQL has a rich set of native data types available to users Users can add new types to PostgreSQL using the CREATE TYPE command Table 8 1 shows all the built in general purpose data types Most of the alternative names listed in the Aliases column are the names used internally by PostgreSQL for historical reasons PostgreSQL Documentation 14 Chapter 8 Data Types. Sep 5 2013 nbsp 0183 32 Any variable you use must be declared with a data type PL pgSQL is a strongly type language as is SQL You can t declare variables without a type Specifying the type shouldn t be a problem because the column you are select also has a type The variable needs to have the same or compatible type Overview of PostgreSQL data types PostgreSQL supports the following data types Boolean Character types such as char varchar and text Numeric types such as integer and floating point number Temporal types such as date time timestamp and interval UUID for storing Universally Unique Identifiers Array for storing array strings numbers
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