1、最大值查詢：

mysql> select max(score) from 4a;

+------------+

| max(score) |

+------------+

|???????? 93 |

+------------+

1 row in set (0.06 sec)

2、最小值查詢：

mysql> select max(4a.score),min(4inall.score) from 4a,4inall;

+---------------+-------------------+

| max(4a.score) | min(4inall.score) |

+---------------+-------------------+

|??????????? 93 |??????????????? 35 |

+---------------+-------------------+

1 row in set (0.08 sec)

3、總和查詢與計數查詢：

這個是原表，接下來的語句都是根據這個表來寫的。

mysql> select * from 4a;

+--------+------+--------+------+--------+------+------+-------+

| sname? | sage | tname? | t??? | cname? | s??? | c??? | score |

+--------+------+--------+------+--------+------+------+-------+

| 劉一?? |?? 18 | 葉平?? |??? 1 | 語文?? |??? 1 |??? 1 |??? 56 |

| 劉一?? |?? 18 | 賀高?? |??? 2 | 數學?? |??? 1 |??? 2 |??? 78 |

| 劉一?? |?? 18 | 楊艷?? |??? 3 |