MySQL max () function usage tutorial, mysqlmax
MySQL's max () function is used to find the maximum value record in a record set.
The EMPLOYEE_TBL table considering the MAX function 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)
Now, assume that you want to obtain the maximum value of daily_typing_pages In the table, simply use the following command:
mysql> SELECT MAX(daily_typing_pages) -> FROM employee_tbl;+-------------------------+| MAX(daily_typing_pages) |+-------------------------+| 350 |+-------------------------+1 row in set (0.00 sec)
All records can be found. The maximum value is that each record uses the group by clause as follows:
mysql> SELECT id, name, work_date, MAX(daily_typing_pages) -> FROM employee_tbl GROUP BY name;+------+------+------------+-------------------------+| id | name | work_date | MAX(daily_typing_pages) |+------+------+------------+-------------------------+| 3 | Jack | 2007-05-06 | 170 || 4 | Jill | 2007-04-06 | 220 || 1 | John | 2007-01-24 | 250 || 2 | Ram | 2007-05-27 | 220 || 5 | Zara | 2007-06-06 | 350 |+------+------+------------+-------------------------+5 rows in set (0.00 sec)
You can also use the MIN function and MAX function to find the minimum value. Try the following example:
mysql> SELECT MIN(daily_typing_pages) least, MAX(daily_typing_pages) max -> FROM employee_tbl;+-------+------+| least | max |+-------+------+| 100 | 350 |+-------+------+1 row in set (0.01 sec)