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About Indexes. Indexes are optional structures associated with tables and clusters that allow SQL statements to execute more quickly against a table. Just as the index in this manual helps you locate information faster than if there were no index, an Oracle Database index provides a faster access path to table data.
SQL Server Yes. Function-based indexing is a very generic approach. Besides functions like UPPER you can also index expressions like A + B and even use user-defined functions in the index definition. There is one important exception.