CREATE XML INDEX (Transact-SQL) [!INCLUDE SQL Server SQL Database] Creates an XML index on a specified table. An index can be created before there is data in the table. XML indexes can be created on ...

To change a rowstore table to a columnstore table, drop all existing indexes on the table and create a clustered columnstore index. For an example, see CREATE COLUMNSTORE INDEX (Transact-SQL).

Learn how to create a clustered index in SQL using the CREATE INDEX statement or a constraint, and some best practices and tips to optimize your index design.

An index stores both the values of a table's columns and a system of directions that enable access to rows in that table by index value. Defining an index on a column or set of columns enables SAS, ...