Sql server 如果执行任何一种方式？

执行以下语句时出现错误：

 /* AccountTypes Constraints */
 IF  EXISTS (SELECT 1 FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[AccountTypes]') AND type in (N'U'))
 BEGIN
  PRINT 'Table [AccountTypes] exist.'

  IF NOT EXISTS(SELECT 1 FROM sys.foreign_keys WHERE object_id = OBJECT_ID(N'[dbo].[FK_Accounts_AccountTypes]') AND parent_object_id = OBJECT_ID(N'[dbo].[Accounts]'))
  BEGIN
   ALTER TABLE [dbo].[Accounts]  WITH NOCHECK ADD  CONSTRAINT [FK_Accounts_AccountTypes] FOREIGN KEY([AccountType])
   REFERENCES [dbo].[AccountTypes] ([AccountTypeID])
   GO
   ALTER TABLE [dbo].[Accounts] CHECK CONSTRAINT [FK_Accounts_AccountTypes]
   GO 
  END
 END
 ELSE
  PRINT 'Table [AccountTypes] Does not exist to create [FK_Accounts_AccountTypes].'
 /* END: AccountTypes Constraints */

情况是表[AccountTypes]确实不存在，但为什么我在检查表是否存在时出现错误

以下是我遇到的错误：

Msg 102, Level 15, State 1, Line 14
Incorrect syntax near 'AccountTypeID'.

Msg 4917, Level 16, State 0, Line 1
Constraint 'FK_Accounts_AccountTypes' does not exist.

Msg 4916, Level 16, State 0, Line 1
Could not enable or disable the constraint. See previous errors.

Msg 156, Level 15, State 1, Line 2
Incorrect syntax near the keyword 'END'.

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SQL 2005 Express必须是批处理中的第一个表。 也就是说，你不能先以你现有的形式来检验存在

那么你就不能中途坚持做分批处理了

因此，动态SQL：

 /* AccountTypes Constraints */
 IF  EXISTS (SELECT 1 FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[AccountTypes]') AND type in (N'U'))
 BEGIN
  PRINT 'Table [AccountTypes] exist.'

  IF NOT EXISTS(SELECT 1 FROM sys.foreign_keys WHERE object_id = OBJECT_ID(N'[dbo].[FK_Accounts_AccountTypes]') AND parent_object_id = OBJECT_ID(N'[dbo].[Accounts]'))
  BEGIN
   EXEC ('ALTER TABLE [dbo].[Accounts]  WITH NOCHECK ADD  CONSTRAINT [FK_Accounts_AccountTypes] FOREIGN KEY([AccountType])
   REFERENCES [dbo].[AccountTypes] ([AccountTypeID])')
   EXEC ('...')

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谢谢你的编辑，不知道发生了什么！预览还可以。