TRIM Function - SQL

Overview

The TRIM function in SQL removes leading and trailing spaces from a string. It is useful for cleaning up input data by removing unnecessary whitespace.

Example:

SELECT TRIM(' Hello ')

Syntax:

SELECT TRIM(string_expression)

string_expression is the string from which you want to remove leading and trailing spaces.

Sample Data:

    
            department_id
            first_name
        
            3
            Frank
        
            2
            Jane
        
            3
            Ashley
        
            NULL
            Glenn
        
            2
            Kelly
        
            1
            Richard
        
            1
            George
        
            5
            Kyle
        
            2
            James
        
            1
            Gustavo

department_id	first_name
3	Frank
2	Jane
3	Ashley
NULL	Glenn
2	Kelly
1	Richard
1	George
5	Kyle
2	James
1	Gustavo

Example: Hard-coded value

In this example, we are removing the leading and trailing spaces from the string ‘ Hello ‘ for an output of ‘hello.’

Example: Query without the WHERE Statement

In this example, we are removing the leading and trailing spaces from the rows in the first_name column.

Example: Query with the WHERE Statement

In this example, we are removing the leading and trailing spaces from the rows in the first_name column where the department_id equals 1.