The max () function in Mysql is using the tutorial _mysql

Source: Internet
Author: User

The max () function of MySQL is used to find a record of the maximum value in a recordset.

The EMPLOYEE_TBL table that you want to know about Max functionality has the following records:

Mysql> SELECT * from EMPLOYEE_TBL;
+------+------+------------+--------------------+
| id |  name | work_date | daily_typing_pages
| +------+------+------------+--------------------+
|  1 | John | 2007-01-24 |        The |
|  2 | Ram | 2007-05-27 |        The |
|  3 | Jack | 2007-05-06 |        170 |
|  3 | Jack | 2007-04-06 |        |
|  4 | Jill | 2007-04-06 |        The |
|  5 | Zara | 2007-06-06 |        A |
|  5 | Zara | 2007-02-06 |        |
+------+------+------------+--------------------+
7 rows in Set (0.00 sec)

Now, suppose you want to simply use the following command based on the maximum value of the daily_typing_pages in the table above:

Mysql> SELECT MAX (daily_typing_pages)
  -> from Employee_tbl;
+-------------------------+
| MAX (daily_typing_pages) |
+-------------------------+
|           |
+-------------------------+
1 row in Set (0.00 sec)

All records can be found, with a maximum value of each 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 |           The |
|  1 | John | 2007-01-24 |           The |
|  2 | Ram | 2007-05-27 |           The |
|  5 | Zara | 2007-06-06 |           |
+------+------+------------+-------------------------+
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 | |
+-------+------+
1 row in Set (0.01 sec)


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