MySQL SELECT DISTINCT 应​​该区分大小写吗？

Question

如何使 MySQL 的 SELECT DISTINCT 区分大小写？

create temporary table X (name varchar(50) NULL);
insert into X values ('this'), ('This');

现在这个查询:

select distinct(name) from X;

结果:

this

这是怎么回事？我希望 SELECT DISTINCT 区分大小写。这不应该是默认的吗？

Answer 1

使用BINARY operator为此:

SELECT DISTINCT(BINARY name) AS Name FROM X;

您还可以CAST选择时:

SELECT DISTINCT 
(CAST(name AS CHAR CHARACTER SET utf8) COLLATE utf8_bin) AS Name FROM X;

查看此SQLFiddle