Jerry Swanson wrote:
Column type is username varchar(100).
When I do select from database:
"select * from user where username='John'"; //returns one row
"select * from user where username='john'"; //returns one row
The records in the database has username 'John'.
Why it isn't case sensitive? 'John" and 'john' .. are two different strings..?
Because it isn't. String comparisons are case insensitive by default in
mysql <http://dev.mysql.com/doc/mysql/en/case-sensitivity.html>.
If you want a case-sensitive comparison, you need to say so with BINARY:
SELECT * FROM user WHERE username = BINARY 'John'.
If you want *ALL* comparisons of the username column to be case
sensitive, then you should declare it as a BINARY type.
username VARCHAR(100) BINARY
or
username VARBINARY(100)
See the manual for details:
<http://dev.mysql.com/doc/mysql/en/char.html>
<http://dev.mysql.com/doc/mysql/en/binary-varbinary.html>
Michael
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