CONCAT Function - SQL

Overview

The CONCAT function in SQL concatenates two or more strings into one string. It is useful for combining multiple strings into a single string.

Example:

SELECT CHAR_LENGTH(string1, string2, ..., stringN)

Syntax:

SELECT CONCAT('Hello', '-', 'World')

string1, string2, ..., stringN are the strings you want to concatenate into a single string.

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 combining the following strings together: ‘Hello,’ ‘-,’ and ‘World,’ for the following output: ‘Hello-World.’

Example: Query without the WHERE Statement

In this example, we are combining the department_id column with the first_name column.

Example: Query with the WHERE Statement

In this example, we are combining the department_id column with the first_name column where the department_id column equals 1.