DROP STATISTICS (Transact-SQL)
Drops statistics for multiple collections within the specified tables in the current database.
Be careful when you drop statistics. Doing so may affect the execution plan chosen by the query optimizer.
Statistics on indexes cannot be dropped by using DROP STATISTICS. Statistics remain as long as the index exists.
For more information about displaying statistics, see DBCC SHOW_STATISTICS (Transact-SQL).
The following example drops the statistics groups (collections) of two tables. The VendorCredit statistics group (collection) of the Vendor table and the CustomerTotal statistics (collection) of the SalesOrderHeader table are dropped.
-- Create the statistics groups. USE AdventureWorks2008R2; GO CREATE STATISTICS VendorCredit ON Purchasing.Vendor (Name, CreditRating) WITH SAMPLE 50 PERCENT CREATE STATISTICS CustomerTotal ON Sales.SalesOrderHeader (CustomerID, TotalDue) WITH FULLSCAN; GO DROP STATISTICS Purchasing.Vendor.VendorCredit, Sales.SalesOrderHeader.CustomerTotal;