How can I make my SQL queries case sensitive?
If you installed SQL Server with the default collation options, you might find that the following queries return the same results:
You can alter your query by forcing collation at the column level:
If you want to do this in a more global way, instead of modifying each individual query, you can force the collation at the database level, or at the column level, using the ALTER DATABASE and ALTER TABLE commands, respectively. You can see the current collation level on the properties tab of the database server, through Enterprise Manager (if you're going to change this setting, MAKE NOTE OF THIS VALUE):
And you can see the description from running the following query:
As changing this setting can impact applications and SQL queries, I would isolate this test first. In SQL Server 2000, you can easily run an ALTER TABLE statement to change the sort order of a specific column, forcing it to be case sensitive. First, execute the following query to determine what you need to change it back to:
The second recordset should contain the following information, in a default scenario:
Whatever the 'Collation' column returns, you now know what you need to change it back to after you make the following change, which will force case sensitivity:
If this screws things up, you can change it back, simply by issuing a new ALTER TABLE statement (be sure to replace my COLLATE identifier with the one you found previously):
If you are stuck with SQL Server 7.0, you can try this workaround, which might be a little more of a performance hit (you should only get a result for the FIRST match):
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