1.簡單查詢

mysql> select * from students;

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

| id | sname | sex | tid |

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

| 0000000001 | orna | 男 | NULL |

| 0000000002 | luscy | 女 | NULL |

| 0000000003 | wangwu | 男 | NULL |

| 0000000020 | zhangsan | 男 | NULL |

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

4 rows in set (0.00 sec)

mysql> select id,ifnull(sname,'無') name from students;

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

| id | name |

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

| 0000000001 | orna |

| 0000000002 | luscy |

| 0000000003 | wangwu |

| 0000000020 | zhangsan |

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

4 rows in set (0.00 sec)

mysql> select * from students where sname like 'o%';

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

| id | sname | sex | tid |

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

| 0000000001 | orna | 男 | NULL |

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

1 row in set (0.00 sec)

2.排序

mysql> select * from students order by sname desc;

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

| id | sname | sex | tid |

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

| 0000000020 | zhangsan | 男 | NULL |

| 0000000003 | wangwu | 男 | NULL |

| 0000000001 | orna | 男 | NULL |

| 0000000002 | luscy | 女 | NULL |

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

4 rows in set (0.00 sec)

mysql> select * from students order by sname desc limit 1;

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

| id | sname | sex | tid |

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

| 0000000020 | zhangsan | 男 | NULL |

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

1 row in set (0.00 sec)

總結

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