MySQL中的max()函数使用教程

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)

前段时间,假诺依照上述要取表中daily_typing_pages的最大值值,轻巧地应用上边包车型地铁命令:

mysql SELECT MAX(daily_typing_pages) - FROM employee_tbl;+-------------------------+| MAX(daily_typing_pages) |+-------------------------+| 350 |+-------------------------+1 row in set (0.00 sec)

也足以运用MIN函数及MAX功能找到的最低值,试试上面包车型地铁事例:

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)

MySQL的max(卡塔尔函数是用来搜索贰个笔录聚焦的最大值记录。

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)

能够找到全部的笔录,最大值为每名使用GROUP BY子句如下:

要驾驭MAX成效思考的EMPLOYEE_TBL表具有以下记录:

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