1:往现有的表中增加一个字段
IF NOT EXISTS ( SELECT 1
FROM sys.sysobjects so WITH ( NOLOCK )
INNER JOIN sys.syscolumns sc WITH ( NOLOCK ) ON so.id = sc.id
WHERE so.name = 'EgPurchase_OrderPlan'
AND sc.name = 'IsNewSystem' )
BEGIN
ALTER TABLE dbo.EgPurchase_OrderPlan ADD IsNewSystem INT NOT NULL DEFAULT 0
EXECUTE sp_addextendedproperty N'MS_Description', '是否推送新系统', N'user',
N'dbo', N'table', N'EgPurchase_OrderPlan', N'column', N'IsNewSystem'
END
GO