TRIM

Removes the longest string containing only characters in <trim_characters> from the left, right, or both sides of the source string <expression>. If no <trim_characters> parameter is specified, the longest string containing only whitespace characters (ASCII Decimal 32) is removed. If neither LEADING, TRAILING, nor BOTH are specified, characters are removed from both sides of the specified source string <expression>.

Syntax

TRIM([LEADING | TRAILING | BOTH] [<trim_characters>] FROM <expression>)

Parameters

Parameter	Description	Supported input types
LEADING | TRAILING | BOTH	Optional. Specifies from which part or parts of the <expression> to remove the specified <trim_characters>.	If omitted, this defaults to BOTH. LEADING - trims from the beginning of the specified string TRAILING - trims from the end of the specified string. BOTH - trims from the beginning and the end of the specified string.
<trim_characters>	Optional. An expression that returns characters to trim from the right side of the <expression> string. If omitted, whitespace (ASCII Decimal 32) is trimmed.	TEXT
<expression>	An expression that returns the string to be trimmed.	TEXT

Return Type

TEXT

Example

The following example trims the characters x and y from the right side of a string, since the TRAILING parameter is specified. Note that the ordering of characters in <trim_characters> is irrelevant:

SELECT
  TRIM(TRAILING 'xy' FROM 'xyxyThe Acceleration Cupyyxx');

Returns:

'xyxyThe Acceleration Cup'

In the following example, no part of the string is specified for TRIM, so it defaults to BOTH.

SELECT
  TRIM('xy' FROM 'xyxyThe Acceleration Cupyyxx');

Returns:

'The Acceleration Cup'

The following example omits the <trim_characters> parameter but specifies the TRAILING parameter, and thus trims whitespace from the right side of a string:

SELECT
  TRIM(TRAILING FROM '   The Acceleration Cup     ');

Returns:

'   The Acceleration Cup'

The following example omits the <trim_characters> parameter and specifies no part of the string, and thus trims whitespace from both sides of a string:

SELECT
  TRIM(FROM '   The Acceleration Cup     ');

Returns:

'The Acceleration Cup'