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ltrim()
A system function which trims characters from the left side of a string
ltrim() is a system function which trims specified characters (default: spaces) from the left side of a string.
ltrim() was added in PostgreSQL 6.1.
Usage
ltrim() is a convenience/compatibility function equivalent to the SQL standard trim():
postgres=# SELECT ltrim('foobar', 'foo'), trim(LEADING 'foo' FROM 'foobar');
ltrim | ltrim
-------+-------
bar | bar
(1 row)
Change history
- PostgreSQL 14
- PostgreSQL 6.1
- added (commit 83978e1e)
Examples
Remove spaces from the left side of a string:
postgres=# SELECT ltrim(' foobar');
ltrim
--------
foobar
(1 row)
Remove a particular character from the left side of a string:
postgres=# SELECT ltrim('XXXfoobar', 'X');
ltrim
--------
foobar
(1 row)
A group of characters for removal can be specified; note the removal will stop when the first character not in that group is encountered:
postgres=# SELECT ltrim('X_Zfoobar', 'XZ_');
ltrim
--------
foobar
(1 row)
postgres=# SELECT ltrim('X_Zfoobar', 'XZ');
ltrim
----------
_Zfoobar
(1 row)
References
- PostgreSQL documentation: Other String Functions