[转] MySQL查询时区分大小写的方法

转自： http://www.soaspx.com/dotnet/sql/mysql/mysql_20090827_206.html

mysql查询默认是不区分大小写的 如：

select  * from  table_name where  a like  'a%'   
select  * from  table_name where  a like  'A%'   
select * from table_name where a like 'a%'
select * from table_name where a like 'A%'

 

效果是一样的。
要让mysql查询区分大小写，可以：

select  * from  table_name where  binary  a like  'a%'   
select  * from  table_name where  binary  a like  'A%'   
select * from table_name where binary a like 'a%'
select * from table_name where binary a like 'A%'

也可以在建表时，加以标识

create  table  table_name(  
     a varchar (20) binary    
);