Detail the usage of SQRT in MySQL

The SQRT function of MySQL is used to calculate the square root of any number. SELECT statement can be used to find any number of square verification roots as follows:

mysql> select SQRT(16);
+----------+
| SQRT(16) |
+----------+
| 4.000000 |
+----------+
1 row in set (0.00 sec)

See the floating point value because internal MySQL will handle the square root of the floating point data type.

You can use the SQRT function to calculate the square root of the record. For more detailed usage of the SQRT function, consider that the table of EMPLOYEE_TBL has the 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)

Suppose you want to calculate the square root of all dialy_typing_pages based on the above table, then you can do this by using the following command:

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)