BTRIM

Removes all occurrences of optionally specified characters, <trimchars_expr>, from both sides of a source string <srcstr_expr>. If no <trimchars_expr> are specified, removes all occurrences of common whitespace (ASCII Decimal 32) characters from both sides of the specified source string.

Syntax

BTRIM(<srcstr_expr>[, <trimchars_expr>])

Parameter	Description
`<srcstr_expr>`	An expression that returns the string to be trimmed. The string can be any of the string data types.
`<trimchars_expr>`	Optional. An expression that returns characters to trim from both sides of the `<srcstr_expr>` string. If omitted, whitespace (ASCII Decimal 32) is assumed.

Examples

Default whitespace trim.

SELECT
  BTRIM('  Hello, world!     ') AS trmdstrng;

Returns:

+------------+
|trmdstrng   |
+------------+
|Hello,world!|
+------------+

Single character trim, with whitespace not specified and left as a remainder.

SELECT
  BTRIM('xxHello, world!  xxx', 'x') AS trmdstrng;

Returns:

+---------------+
|trmdstrng      |
+---------------+
|Hello,world!   |
+---------------+

Multiple character trim, with all specified characters removed, regardless of ordering.

SELECT
  BTRIM('xyxyHello, world!yyxx', 'xy') AS trmdstrng;

Returns:

+------------+
|trmdstrng   |
+------------+
|Hello,world!|
+------------+