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  • What is the use of GROUP by statement in MySQL?

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    The GROUP by statement is used with the aggregate functions to group the result by one or more columns.

    GROUP by Syntax

    SELECT column_name, aggregate_function(column_name) FROM table_name WHERE column_name operator value GROUP by column_name;

    We have a table "employee" as below:

        employee
        id  first_name            last_name       salary
        .......................................................
        1   John                     Simp         10000
        2   Chris                    Hely         25000
        3   John                     Roy          20000
        4   Jenny                    Mill         35000
        5   Jenny                    Simpson      35000
    
    

    GROUP by Example

    Now we want to find occurrence of first name value in column "first_name" then you just need to write the below command:

    SELECT first_name, COUNT(fistr_name) as count
    FROM employee 
    GROUP by first_name;
    

    Result:

        first_name            count
        .............................
        John                  2
        Chris                 1
        Jenny                 2
    

    Hope this will help you :)

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