假设您使用的是 MS SQL Server:
这些查询中的哪一个将执行得最快,为什么?
我猜是最后一个,因为我认为 Aliases 只解析到他们的表一次?
SELECT Account.AccountName,
AccountStatus.AccountState
FROM
dbo.Account
INNER JOIN dbo.AccountStatus ON Account.AccountStatusID = AccountStatus.AccountStatusID
GO
SELECT dbo.Account.AccountName,
dbo.AccountStatus.AccountState
FROM
dbo.Account
INNER JOIN dbo.AccountStatus ON dbo.Account.AccountStatusID = dbo.AccountStatus.AccountStatusID
GO
SELECT A.AccountName,
AST.AccountState
FROM
dbo.Account AS A
INNER JOIN dbo.AccountStatus AS AST ON A.AccountStatusID = AST.AccountStatusID
GO