The max of function in MySQL USES the tutorial
- 2020-10-31 22:01:04
- OfStack
The max() function of MySQL is used to find the maximum record in a recordset.
To understand that the EMPLOYEE_TBL table considered for MAX functionality 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, assuming that you want to get the maximum value of daily_typing_pages from the table above, 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 the records can be found, with the maximum value per name using 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 the MAX function to find the lowest 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)