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TRIM Function

Removes leading and trailing whitespace from a string. Spacing between words is not removed.

  • If a string begins or ends with spaces, tabs, or other non-visible characters, they are removed by this function.

  • The TRIM function does not remove whitespace between non-whitespace values, such as spaces between words. To remove that type of whitespace, use REMOVEWHITESPACE. See REMOVEWHITESPACE Function.

  • The TRIM function can be used with the TRIMQUOTES function, which removes leading and trailing single- and double-quotes. For more information, see TRIMQUOTES Function.

Wrangle vs. SQL: This function is part of Wrangle, a proprietary data transformation language. Wrangle is not SQL. For more information, see Wrangle Language.

Basic Usage

Column reference example:

trim(MyName)

Output: Returns the values of the MyName column value with whitespace removed from the beginning and the end.

String literal example:

trim(' Hello, World ')

Output: Returns the string:Hello, World.

Syntax and Arguments

trim(column_string)

Argument

Required?

Data Type

Description

column_string

Y

string

Name of the column or string literal to be applied to the function

For more information on syntax standards, see Language Documentation Syntax Notes.

column_string

Name of the column or string constant to be trimmed.

  • Missing string or column values generate missing string results.

  • String constants must be quoted ('Hello, World').

  • Multiple columns and wildcards are not supported.

Usage Notes:

Required?

Data Type

Example Value

Yes

String literal or column reference

myColumn

Examples

ヒント

For additional examples, see Common Tasks.

Example - Trimming leading and trailing whitespace

In this example, whitespace values are identified according to this table. The ASCII value column identifies that ASCII character value that represents the character.

  • The ASCII character set is a standard method for representing keyboard and special characters on the computer. For more information on ASCII, see http://www.asciitable.com/.

Value

Definition

ASCII value

(space)

spacebar

Char(32)

(tab)

tab character

Char(9)

(cr)

carriage return

Char(13)

(nl)

newline

Char(10)

Source:

In the following example dataset, input values are represented in the mystring. The values in the table above are represented in the string values below.

mystring

Here's my string.

(space)(space)Here's my string.(space)(space)

(tab)Here's my string.(tab)

(cr)Here's my string.(cr)

(nl)Here's my string.(nl)

(space)(space)(tab)Here's my string.(tab)(space)(space)

(space)(space)(tab)(cr)Here's my string.(cr)(tab)(space)(space)

(space)(space)(tab)(nl)(cr)Here's my string.(cr)(nl)(tab)(space)(space)

Input:

When the above CSV data is imported into the Transformer page, it is represented as the following:

mystring

Here's my string.

(space)(space)Here's my string.(space)(space)

"(tab)Here's my string.(tab)"

"(cr)Here's my string.(cr)"

"(nl)Here's my string.(nl)"

"(space)(space)(tab)Here's my string.(tab)(space)(space)"

"(space)(space)(tab)(cr)Here's my string.(cr)(tab)(space)(space)"

"(space)(space)(tab)(nl)(cr)Here's my string.(cr)(nl)(tab)(space)(space)"

Transformation:

You might notice the quote marks around most of the imported values.

注記

If an imported string value contains tab, carriage return, or newline values, it is bracketed by double quotes.

The first step is to remove the quote marks. You can select one of the quote marks in the data grid and then select the appropriate Replace suggestion card. The transform should look like the following:

Transformation Name

Replace text or pattern

Parameter: Column

mystring

Parameter: Find

`"`

Parameter: Replace with

''

Parameter: Match all occurrences

true

Now, you can apply the trim function:

Transformation Name

New formula

Parameter: Formula type

Single row formula

Parameter: Formula

trim(mystring)

Parameter: New column name

'trim_mystring'

Results:

In the generated trim_mystring column, you can see the cleaned strings:

mystring

trim_mystring

Here's my string.

Here's my string.

(space)(space)Here's my string.(space)(space)

Here's my string.

"(tab)Here's my string.(tab)"

Here's my string.

"(cr)Here's my string.(cr)"

Here's my string.

"(nl)Here's my string.(nl)"

Here's my string.

"(space)(space)(tab)Here's my string.(tab)(space)(space)"

Here's my string.

"(space)(space)(tab)(cr)Here's my string.(cr)(tab)(space)(space)"

Here's my string.

"(space)(space)(tab)(nl)(cr)Here's my string.(cr)(nl)(tab)(space)(space)"

Here's my string.

ヒント

If any bracketing double quotes are removed, then tab, carriage return, and newline values are trimmed by the TRIM function.

Example - String cleanup functions together

This example demonstrates functions that can be used to clean up strings.

Functions:

Item

Description

TRIM Function

Removes leading and trailing whitespace from a string. Spacing between words is not removed.

REMOVEWHITESPACE Function

Removes all whitespace from a string, including leading and trailing whitespace and all whitespace within the string.

REMOVESYMBOLS Function

Removes all characters from a string that are not letters, numbers, accented Latin characters, or whitespace.

Source:

In the following (space) and (tab) indicate space keys and tabs, respectively. Carriage return and newline characters are also supported by whitespace functions.

Strings

source

String01

this source(space)(space)

String02

(tab)(tab)this source

String03

(tab)(tab)this source(space)(space)

String04

this source's?

String05

Why, you @#$%^&*()!

String06

this söurce

String07

(space)this söurce

String08

à mañana

Transformation:

The following transformation steps generate new columns using each of the string cleanup functions:

Transformation Name

New formula

Parameter: Formula type

Single row formula

Parameter: Formula

TRIM(source)

Parameter: New column name

'trim_source'

Transformation Name

New formula

Parameter: Formula type

Single row formula

Parameter: Formula

REMOVEWHITESPACE(source)

Parameter: New column name

'removewhitespace_source'

Transformation Name

New formula

Parameter: Formula type

Single row formula

Parameter: Formula

REMOVESYMBOLS(source)

Parameter: New column name

'removesymbols_source'

Results:

Strings

source

removesymbols_source

removewhitespace_source

trim_source

String01

this source(space)(space)

this source(space)(space)

thissource

this source

String02

(tab)(tab)this source

(tab)(tab)this source

thissource

this source

String03

(tab)(tab)this source(space)(space)

(tab)(tab)this source(space)(space)

thissource

this source

String04

this source's?

this sources

thissource's?

this source's?

String05

"Why, you @#$%^&*()!"

Why you

Why,you@#$%^&*()!

Why, you @#$%^&*()!

String06

this söurce

this söurce

thissöurce

this söurce

String07

(space)this söurce

(space)this söurce

thissöurce

this söurce

String08

à mañana

à mañana

àmañana

à mañana