MySQL查詢時區分大小寫

標籤：

1、一種方法是可以設定表或行的collation，使其為binary或case sensitive。在MySQL中，對於Column Collate其約定的命名方法如下： 

*_bin: 表示的是binary case sensitive collation，也就是說是區分大小寫 
*_cs: case sensitive collation，區分大小寫 
*_ci: case insensitive collation，不區分大小寫 

########### # Start binary collation example ########### mysql> create table case_bin_test (word VARCHAR(10)) CHARACTER SET latin1 COLLATE latin1_bin; Query OK, 0 rows affected (0.02 sec) mysql> INSERT INTO case_bin_test VALUES (‘Frank‘),(‘Google‘),(‘froogle‘),(‘flickr‘),(‘FlicKr‘); Query OK, 5 rows affected (0.00 sec) Records: 5 Duplicates: 0 Warnings: 0 mysql> SELECT * FROM case_bin_test WHERE word LIKE ‘f%‘; +---------+ | word | +---------+ | froogle | | flickr | +---------+ 2 rows in set (0.00 sec) mysql> SELECT * FROM case_bin_test WHERE word LIKE ‘F%‘; +---------+ | word | +---------+ | Frank | | FlicKr | +---------+ 4 rows in set (0.00 sec) ########### # End ########### 

 

2、另外一種方法 

########### # Start case sensitive collation example ########### mysql> create table case_cs_test (word VARCHAR(10)) CHARACTER SET latin1 COLLATE latin1_general_cs; Query OK, 0 rows affected (0.08 sec) mysql> INSERT INTO case_cs_test VALUES (‘Frank‘),(‘Google‘),(‘froogle‘),(‘flickr‘),(‘FlicKr‘); Query OK, 5 rows affected (0.00 sec) Records: 5 Duplicates: 0 Warnings: 0 mysql> SELECT * FROM case_cs_test WHERE word LIKE ‘F%‘; +---------+ | word | +---------+ | Frank | | FlicKr | +---------+ 4 rows in set (0.00 sec) mysql> SELECT * FROM case_cs_test WHERE word LIKE ‘f%‘; +---------+ | word | +---------+ | froogle | | flickr | +---------+ 2 rows in set (0.00 sec) ########### # end ########### 

 

3、還有一種方法就是在查詢時指定collation 

mysql> create table case_test (word VARCHAR(10)) CHARACTER SET latin1; Query OK, 0 rows affected (0.01 sec) mysql> INSERT INTO case_test VALUES (‘Frank‘),(‘Google‘),(‘froogle‘),(‘flickr‘),(‘FlicKr‘); Query OK, 7 rows affected (0.01 sec) Records: 7 Duplicates: 0 Warnings: 0 mysql> SELECT * FROM case_test WHERE word LIKE ‘f%‘; +---------+ | word | +---------+ | Frank | | froogle | | flickr | | FlicKr | +---------+ 6 rows in set (0.01 sec) mysql> SELECT * FROM case_test WHERE word LIKE ‘F%‘; +---------+ | word | +---------+ | Frank | | froogle | | flickr | | FlicKr | +---------+ 6 rows in set (0.01 sec) mysql> SELECT * FROM case_test WHERE word COLLATE latin1_bin LIKE ‘F%‘; +---------+ | word | +---------+ | Frank | | FlicKr | +---------+ 4 rows in set (0.05 sec) mysql> SELECT * FROM case_test WHERE word COLLATE latin1_bin LIKE ‘f%‘; +---------+ | word | +---------+ | froogle | | flickr | +---------+ 2 rows in set (0.00 sec) 

mysql> SELECT * FROM case_test WHERE word LIKE ‘f%‘ COLLATE latin1_bin; +---------+ | word | +---------+ | froogle | | flickr | +---------+ 2 rows in set (0.00 sec) mysql> SELECT * FROM case_test WHERE word LIKE ‘F%‘ COLLATE latin1_bin; +---------+ | word | +---------+ | Frank | | FlicKr | +---------+ 4 rows in set (0.01 sec) 

mysql> SELECT * FROM case_test WHERE word LIKE ‘F%‘ COLLATE latin1_general_cs; +---------+ | word | +---------+ | Frank | | FlicKr | +---------+ 4 rows in set (0.04 sec)

 

 

要讓mysql查詢區分大小寫，可以： 

1. select  * from  table_name where  binary  a like  ‘a%‘   
2. select  * from  table_name where  binary  a like  ‘A%‘   

 

註：這樣查詢非常慢，不建議使用

也可以在建表時，加以標識 

create  table  table_name(  

     a varchar (20) binary

) 

MySQL查詢時區分大小寫