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# MySQL SUM Function

MySQL SUM function is used to find out the sum of a field in various records.

To understand SUM function consider an employee_tbl table which is having following records:

    mysql> SELECT * FROM employee_tbl;
    +------+------+------------+--------------------+
    | id   | name | work_date  | daily_typing_pages |
    +------+------+------------+--------------------+
    |    1 | John | 2007-01-24 |                250 |
    |    2 | Ram  | 2007-05-27 |                220 |
    |    3 | Jack | 2007-05-06 |                170 |
    |    3 | Jack | 2007-04-06 |                100 |
    |    4 | Jill | 2007-04-06 |                220 |
    |    5 | Zara | 2007-06-06 |                300 |
    |    5 | Zara | 2007-02-06 |                350 |
    +------+------+------------+--------------------+
    7 rows in set (0.00 sec)

Now suppose based on the above table you want to calculate total of all the dialy_typing_pages then you can do so by using the following command:

    mysql> SELECT SUM(daily_typing_pages)
        -> FROM employee_tbl;
    +-------------------------+
    | SUM(daily_typing_pages) |
    +-------------------------+
    |                    1610 |
    +-------------------------+
    1 row in set (0.00 sec)

You can take sum of various records set using GROUP BY clause. Following example will sum up all the records related to a single person and you will have total typed pages by every person.

    mysql> SELECT name, SUM(daily_typing_pages)
        -> FROM employee_tbl GROUP BY name;
    +------+-------------------------+
    | name | SUM(daily_typing_pages) |
    +------+-------------------------+
    | Jack |                     270 |
    | Jill |                     220 |
    | John |                     250 |
    | Ram  |                     220 |
    | Zara |                     650 |
    +------+-------------------------+
    5 rows in set (0.17 sec)

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