How to Perform Case-Insensitive String Comparisons in SQL Server?

Case-Insensitive Queries in SQL Server

In SQL Server, string comparisons are typically case-sensitive. However, if you need to perform a case-insensitive comparison in a WHERE clause, you can use the COLLATE operator.

Example:

Suppose you have the following data in a table called myTable:

| myField |
|---------|
| sOmeVal |
| AnOtHeRVaL |

The following query selects all rows where the myField column is equal to sOmeVal in a case-insensitive manner:

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

The COLLATE operator takes two arguments:

• The expression to be compared
• The collation to be used for the comparison

The collation specifies the rules for comparing strings. In this example, we are using the SQL_Latin1_General_CP1_CI_AS collation, which performs case-insensitive comparisons.

Note that the default collation for your database may be different. You can check the default collation using the following query:

SELECT COLLATION_NAME FROM sys.databases WHERE name = 'myDatabase';

If the default collation is not case-insensitive, you will need to specify the collation explicitly in your queries.

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