How Can I Create Case-Insensitive WHERE Clauses in SQL Server?

Case-Insensitive WHERE Clauses in SQL Server

Querying for Data without Regard to Case

In SQL Server, string comparisons are generally case-insensitive by default. However, if you encounter a scenario where case sensitivity becomes an issue, you can specify a collation within your WHERE clause to explicitly handle this behavior.

For instance, consider the following query:

SELECT * FROM myTable WHERE myField = 'sOmeVal'

If your database configuration (collation) is not set to be case-insensitive, this query will only return results where the value of 'myField' is an exact match to 'sOmeVal'. To ignore case in your comparisons, you can use the COLLATE operator as follows:

SELECT * FROM myTable WHERE myField COLLATE SQL_Latin1_General_CP1_CI_AS = 'sOmeVal'

The specified collation (SQL_Latin1_General_CP1_CI_AS in this example) determines the rules for comparing strings, including case sensitivity. By using a case-insensitive collation like CI (Case-Insensitive), you ensure that the WHERE clause ignores case differences in the comparison.

Note that the choice of collation depends on the specific database configuration. You should refer to the Microsoft documentation for a comprehensive list of available collations.

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