https://sqlines.com/ 2026-04-29T14:54:35+00:00 https://sqlines.com/ https://sqlines.com/lib/images/favicon.ico text/html 2024-06-21T19:45:25+00:00 https://sqlines.com/sql-server/statements/create_index?rev=1718999125&do=diff In SQL Server, you can use CREATE INDEX statement to create a unique or non-unique, clustered or nonclustered index on a table or view. Unique Indexes in SQL Server An unique index does not allow duplicate values: NULL Values in Unique Index A single NULL value can be inserted Multiple NULL values are considered duplicates SQL Server allows you to define a unique index on nullable columns and insert a NULL value: