#Create a unique index postico download

Create a nonclustered index called IX_ProductVendor_VendorID WHERE name = N'IX_ProductVendor_VendorID')ĭROP INDEX IX_ProductVendor_VendorID ON Purchasing.ProductVendor Find an existing index named IX_ProductVendor_VendorID and delete it if found.

#Create a unique index postico download

See AdventureWorks sample databases to download AdventureWorks2019.Ĭopy and paste the following example into the query window and click Execute. In Object Explorer, connect to an instance of Database Engine with AdventureWorks2019 installed. Using Transact-SQL To create a nonclustered index on a table In the Select Columns from table_name dialog box, select the check box or check boxes of the table column or columns to be added to the nonclustered index.

In the New Index dialog box, on the General page, enter the name of the new index in the Index name box. Right-click the Indexes folder, point to New Index, and select Non-Clustered Index. To create a nonclustered index by using Object ExplorerĮxpand the table on which you want to create a nonclustered index. In the grid, select Create as Clustered, and choose No from the drop-down list to the right of the property. Select the new index in the Selected Primary/Unique Key or Index text box. In the Indexes/Keys dialog box, click Add. Right-click on the column you want to create the nonclustered index on and select Indexes/Keys.

Right-click the table on which you want to create a nonclustered index and select Design. In Object Explorer, expand the database that contains the table on which you want to create a nonclustered index. Using SQL Server Management Studio To create a nonclustered index by using the Table Designer User must be a member of the sysadmin fixed server role or the db_ddladmin and db_owner fixed database roles. Requires ALTER permission on the table or view. For more information, see Create Indexed Views. This includes any indexes created by PRIMARY KEY or UNIQUE constraints, but does not include XML indexes.Īfter a unique clustered index has been created on a view, nonclustered indexes can be created. The maximum number of nonclustered indexes that can be created per table is 999. For more information, see Unique Constraints and Check Constraints.īy default, a nonclustered index is created if clustered is not specified. You can specify a unique clustered index if a clustered index on the table does not already exist. When you create a UNIQUE constraint, a unique nonclustered index is created to enforce a UNIQUE constraint by default. Nonclustered indexes are implemented in the following ways: You can create multiple nonclustered indexes on a table or indexed view. Generally, nonclustered indexes are created to improve the performance of frequently used queries not covered by the clustered index or to locate rows in a table without a clustered index (called a heap). Nonclustered indexes can often help you find data more quickly than searching the underlying table queries can sometimes be answered entirely by the data in the nonclustered index, or the nonclustered index can point the Database Engine to the rows in the underlying table. A nonclustered index is an index structure separate from the data stored in a table that reorders one or more selected columns. You can create nonclustered indexes in SQL Server by using SQL Server Management Studio or Transact-SQL.