---
title: "DROP STATISTICS (Transact-SQL) | Microsoft Docs"
ms.custom: ""
ms.date: "03/22/2016"
ms.prod: sql
ms.prod_service: "database-engine, sql-database, sql-data-warehouse, pdw"
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ms.technology: t-sql
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f1_keywords: 
  - "DROP STATISTICS"
  - "DROP_STATISTICS_TSQL"
dev_langs: 
  - "TSQL"
helpviewer_keywords: 
  - "removing statistics"
  - "column statistics [SQL Server]"
  - "DROP STATISTICS statement"
  - "deleting statistics"
  - "dropping statistics"
  - "table statistics [SQL Server]"
  - "statistical information [SQL Server], removing"
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author: CarlRabeler
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---
# DROP STATISTICS (Transact-SQL)
[!INCLUDE[tsql-appliesto-ss2008-all-md](../../includes/tsql-appliesto-ss2008-all-md.md)]

  Drops statistics for multiple collections within the specified tables in the current database.  
  
 ![Topic link icon](../../database-engine/configure-windows/media/topic-link.gif "Topic link icon") [Transact-SQL Syntax Conventions](../../t-sql/language-elements/transact-sql-syntax-conventions-transact-sql.md)  
  
## Syntax  
  
```syntaxsql
-- Syntax for SQL Server and Azure SQL Database  
  
DROP STATISTICS table.statistics_name | view.statistics_name [ ,...n ]  
```  
  
```syntaxsql
-- Syntax for Azure SQL Data Warehouse and Parallel Data Warehouse  
  
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](../../relational-databases/databases/database-identifiers.md). 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)](../../t-sql/database-console-commands/dbcc-show-statistics-transact-sql.md).  
  
## 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 AdventureWorks2012;  
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: [!INCLUDE[ssSDWfull](../../includes/sssdwfull-md.md)] and [!INCLUDE[ssPDW](../../includes/sspdw-md.md)]  
  
### 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)](../../t-sql/statements/alter-database-transact-sql.md)   
 [CREATE INDEX (Transact-SQL)](../../t-sql/statements/create-index-transact-sql.md)   
 [CREATE STATISTICS (Transact-SQL)](../../t-sql/statements/create-statistics-transact-sql.md)   
 [sys.stats (Transact-SQL)](../../relational-databases/system-catalog-views/sys-stats-transact-sql.md)   
 [sys.stats_columns (Transact-SQL)](../../relational-databases/system-catalog-views/sys-stats-columns-transact-sql.md)   
 [DBCC SHOW_STATISTICS (Transact-SQL)](../../t-sql/database-console-commands/dbcc-show-statistics-transact-sql.md)   
 [sp_autostats (Transact-SQL)](../../relational-databases/system-stored-procedures/sp-autostats-transact-sql.md)   
 [sp_createstats (Transact-SQL)](../../relational-databases/system-stored-procedures/sp-createstats-transact-sql.md)   
 [UPDATE STATISTICS (Transact-SQL)](../../t-sql/statements/update-statistics-transact-sql.md)   
 [EVENTDATA (Transact-SQL)](../../t-sql/functions/eventdata-transact-sql.md)   
 [USE (Transact-SQL)](../../t-sql/language-elements/use-transact-sql.md)