DROP STATISTICS (Transact-SQL)
Applies to: SQL Server Azure SQL Database Azure SQL Managed Instance Azure Synapse Analytics Analytics Platform System (PDW) SQL analytics endpoint in Microsoft Fabric Warehouse in Microsoft Fabric
Drops statistics for multiple collections within the specified tables in the current database.
Note
For more information on statistics in Microsoft Fabric, see Statistics in Microsoft Fabric.
Transact-SQL syntax conventions
Syntax
-- Syntax for SQL Server and Azure SQL Database
DROP STATISTICS table.statistics_name | view.statistics_name [ ,...n ]
-- Syntax for Azure Synapse Analytics and Parallel Data Warehouse and Microsoft Fabric
DROP STATISTICS [ schema_name . ] table_name.statistics_name
[;]
Arguments
table | view
Is the name of the target table or indexed view for which statistics should be dropped. Table and view names must comply with the rules for Database Identifiers. Specifying the table or view owner name is optional.
statistics_name
Is the name of the statistics group to drop. Statistics names must comply with the rules for identifiers
Remarks
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).
Permissions
Requires ALTER permission on the table or view.
Examples
A. Dropping statistics from a table
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 AdventureWorks2022;
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;
Examples: Azure Synapse Analytics and Analytics Platform System (PDW)
B. Dropping statistics from a table
The following examples drop the CustomerStats1
statistics from table Customer
.
DROP STATISTICS Customer.CustomerStats1;
DROP STATISTICS dbo.Customer.CustomerStats1;
See Also
ALTER DATABASE (Transact-SQL)
CREATE INDEX (Transact-SQL)
CREATE STATISTICS (Transact-SQL)
sys.stats (Transact-SQL)
sys.stats_columns (Transact-SQL)
DBCC SHOW_STATISTICS (Transact-SQL)
sp_autostats (Transact-SQL)
sp_createstats (Transact-SQL)
UPDATE STATISTICS (Transact-SQL)
EVENTDATA (Transact-SQL)
USE (Transact-SQL)
Statistics in Microsoft Fabric