Contents
concat()
A function for concatenating values
concat() is a system function for concatenating arbitrary values into a text string.
concat() was added in PostgreSQL 9.1.
Usage
concat (val1any[,val2any[, ...] ] ) →text
To concatenate values using a delimiter, use concat_ws().
To aggregate string values from columns in a query, use string_agg().
Change history
- PostgreSQL 9.1
- added (commit 49b27ab5)
Examples
Basic usage example for concat():
postgres=# SELECT concat('foo', 'bar');
concat
--------
foobar
(1 row)
Differing data types can be concatenated:
postgres=# SELECT concat('foo', 1, 1.5, ARRAY[2,3], '{"4":"baz"}'::json);
concat
-------------------------
foo11.5{2,3}{"4":"baz"}
(1 row)
NULL values are ignored:
postgres=# SELECT concat('foo', NULL, 'bar');
concat
--------
foobar
(1 row)
An empty string will be returned if all provided values are NULL:
postgres=# SELECT concat(NULL, NULL) IS NULL; ?column? ---------- f (1 row)
References
- PostgreSQL documentation: Other String Functions
