如何以不区分大小写的方式在MySQL中搜索

Question

How can I search for a user even if I don't know the exact spelling with regards to case, like

SELECT * FROM USER WHERE U.NAME =  'STEVEN';

Meaning: if a user has the name "Steven" or "sTEVEN" how can I search all persons who have this name?

I tried it, but it does not work.

WHERE email LIKE '%GMAIL%'

It did not not work when case was lowercase.

Answer 1

The case sensitivity is based on the character set and collation of the table.

The default character set and collation are latin1 and latin1_swedish_ci, so nonbinary string comparisons are case insensitive by default.

http://dev.mysql.com/doc/refman/5.0/en/case-sensitivity.html

You may want to look at the collation of your table if the searches are case-sensitive.

Answer 2

使用UPPER

SELECT * FROM USER WHERE UPPER(U.NAME) = 'STEVEN'

Answer 3

Have a look at using

UPPER and LOWER