String concatenation operators

To concatenate two strings on a single line, use the concatenation operator (two consecutive vertical bars).

Syntax

string || string

Parameters

string Is an expression of type CHAR or VARCHAR

Notes

|| is used to concatenate expressions and constants. The expressions are cast to VARCHAR if possible, otherwise to VARBINARY, and must both be one or the other.
Two consecutive strings within a single SQL statement on separate lines are automatically concatenated

Examples

The following example is a single string written on two lines:

=> SELECT E'xx'-> '\\';
 ?column?
----------
 xx\
(1 row)

The following examples show two strings concatenated:

=> SELECT E'xx' ||-> '\\';
 ?column?
----------
 xx\\
(1 row)

=> SELECT 'auto' || 'mobile';
 ?column?
----------
 automobile
(1 row)

=> SELECT 'auto'-> 'mobile';
 ?column?
----------
 automobile
(1 row)

=> SELECT 1 || 2;
 ?column?
----------
 12
(1 row)


=> SELECT '1' || '2';
 ?column?
----------
 12
(1 row)
=> SELECT '1'-> '2';
 ?column?
----------
 12
(1 row)