????6???????????????????????????У???????????????????????????????AdventureWorks??

????7?????????С??У???????????￡?

??8????????С?

????9??????SQLServer???????????????

????10?????????????????????????????

USE AdventureWorks
GO
SET TRANSACTION ISOLATION LEVEL REPEATABLE READ
GO
BEGIN TRANSACTION
SELECT  *
FROM    Sales.SalesOrderDetail
WHERE   SalesOrderDetailID = 121316

????11????????????????????????????????

USE AdventureWorks
GO
SET TRANSACTION ISOLATION LEVEL REPEATABLE READ
BEGIN TRANSACTION
SELECT  *
FROM    Sales.SalesOrderDetail
WHERE   SalesOrderDetailID = 121317

????12????????????????壬???????????????
UPDATE Sales.SalesOrderDetail
SET OrderQty=2
WHERE SalesOrderDetailID=121317

??13???????????????????????
UPDATE Sales.SalesOrderDetail
SET OrderQty=2
WHERE SalesOrderDetailID=121316