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mysql select 區分大小寫_Mysqlselect預設不區分大小寫

http://blog.chinaunix.net/u/29134/showart_355336.html MYSQL 在預設的情況下查詢是不區分 大小寫 的,例如: mysql create table t1( - name varchar(10)); Query OK, 0 rows affected (0.09 sec) mysql insert into t1 values('you'),('You'),('YOU'); Q

http://blog.chinaunix.net/u/29134/showart_355336.html

MYSQL在預設的情況下查詢是不區分大小寫的,例如:

mysql> create table t1(

-> name varchar(10));

Query OK, 0 rows affected (0.09 sec)

mysql> insert into t1 values('you'),('You'),('YOU');

Query OK, 3 rows affected (0.05 sec)

Records: 3 Duplicates: 0 Warnings: 0

對這個表,預設情況下,下面兩個查詢的結果是一樣的:

mysql> select * from t1 where name = 'you';

+------+

| name |

+------+

| you |

| You |

| YOU |

+------+

3 rows in set (0.00 sec)

mysql> select * from t1 where name = 'YOU';

+------+

| name |

+------+

| you |

| You |

| YOU |

+------+

3 rows in set (0.00 sec) 如果想讓MYSQL知道你輸入的字母是大寫還是小寫的,修改表:

mysql> alter table t1 change name name varchar(10) binary;

Query OK, 3 rows affected (0.20 sec)

Records: 3 Duplicates: 0 Warnings: 0

mysql> select * from t1 where name = 'you';

+------+

| name |

+------+

| you |

+------+

1 row in set (0.00 sec)

mysql> select * from t1 where name = 'YOU';

+------+

| name |

+------+

| YOU |

+------+

1 row in set (0.00 sec)

如果你隻是想在SQL語句中實作的話:

mysql> select * from t1 where name = binary 'YOU';

+------+

| name |

+------+

| YOU |

+------+

1 row in set (0.02 sec)

mysql> select * from t1 where name = binary 'you';

+------+

| name |

+------+

| you |

+------+

1 row in set (0.00 sec)

如果不想這麼麻煩而想服務一開啟就讓大小寫一緻的話:

可以修改my.ini或者my.cnf

[mysqld]

lower_case_table_names=1

(0:區分;1:不區分)

然後重新開機MYSQL服務。

mysql> show variables like '%case_table%';

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

| Variable_name | Value |

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

| lower_case_table_names | 1 |

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

1 row in set (0.00 sec)

注:WINDOWS系統不用修改,系統預設就是1

LINUX 系統預設是0。因為LINUX下的腳本都是區分大小寫的。

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