无涯教程-SQL MIN Function函数 SQL MIN 函数用于在记录集中找出最小值的记录。要了解 MIN 函

SQL MIN 函数用于在记录集中找出最小值的记录。

要了解 MIN 函数，请考虑一个 employee_tbl 表，该表具有以下记录-

SQL> 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)

现在假设基于上表您要获取daily_typing_pages的最小值，那么您可以使用以下命令简单地做到这一点-

SQL> SELECT MIN(daily_typing_pages)
   -> FROM employee_tbl;
+-------------------------+
| MIN(daily_typing_pages) |
+-------------------------+
|                     100 |
+-------------------------+
1 row in set (0.00 sec)

您可以使用 GROUP BY 子句找到每个名称具有最小值的所有记录，如下所示-

SQL> SELECT id, name, work_date, MIN(daily_typing_pages)
    -> FROM employee_tbl GROUP BY name;
+------+------+-------------------------+
| id   | name | MIN(daily_typing_pages) |
+------+------+-------------------------+
|    3 | Jack |                     100 |
|    4 | Jill |                     220 |
|    1 | John |                     250 |
|    2 | Ram  |                     220 |
|    5 | Zara |                     300 |
+------+------+-------------------------+
5 rows in set (0.00 sec)

您还可以将 MIN 函数与 MAX 函数一起使用，以找出最小值。尝试以下示例-

SQL> 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)

无涯教程-SQL MIN Function函数

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