delete join


Using joins and subqueries to data in one table to delete rows in another table

The following examples show two ways to delete rows in one table based on data in another table. In both examples, rows from the SalesPersonQuotaHistory table based are deleted based on the year-to-date sales stored in the SalesPerson table. The first DELETE statement shows the ISO-compatible subquery solution, and the second DELETE statement shows the Transact-SQL FROM extension to join the two tables.
-- SQL-2003 Standard subquery

USE AdventureWorks2012;
GO
DELETE FROM Sales.SalesPersonQuotaHistory
WHERE BusinessEntityID IN
(SELECT BusinessEntityID
FROM Sales.SalesPerson
WHERE SalesYTD > 2500000.00);
GO
-- Transact-SQL extension
USE AdventureWorks2012;
GO
DELETE FROM Sales.SalesPersonQuotaHistory
FROM Sales.SalesPersonQuotaHistory AS spqh
INNER JOIN Sales.SalesPerson AS sp
ON spqh.BusinessEntityID = sp.BusinessEntityID
WHERE sp.SalesYTD > 2500000.00;
GO
http://msdn.microsoft.com/en-us/library/ms189835.aspx
Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

%d bloggers like this: