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
}
MySQL区分大小写的查询
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