How to use the SQRT function in MySQL

This article mainly introduces the use of the SQRT function in MySQL, is the basic knowledge of MySQL introductory learning, need friends can refer to the following

MySQL's sqrt function is used to compute any number of square roots. You can use the SELECT statement to find any number of square verification roots as follows:

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Mysql> Select SQRT (16); +----------+ | SQRT (16) | +----------+ | 4.000000 | +----------+ 1 row in Set (0.00 sec)

The floating-point value you see, because internal MySQL handles the square root of the floating-point data type.

You can use the SQRT function to calculate the square root of a record. For more detailed use of the SQRT function, consider the EMPLOYEE_TBL table with the following records:

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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)

Suppose, based on the table above, to calculate the square root of all dialy_typing_pages, you can then use the following command:

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mysql> SELECT name, SQRT (daily_typing_pages)-> from Employee_tbl; +------+--------------------------+ | name | SQRT (daily_typing_pages) | +------+--------------------------+ | John | 15.811388 | | Ram | 14.832397 | | Jack | 13.038405 | | Jack | 10.000000 | | Jill | 14.832397 | | Zara | 17.320508 | | Zara | 18.708287 | +------+--------------------------+ 7 rows in Set (0.00 sec)