摘要:
https://www.cnblogs.com/Brambling/archive/2017/04/21/6741666.html 阅读全文
摘要:
-- add column IF NOT EXISTS (SELECT * FROM sys.columns WHERE name='WOAServedStatus' AND object_id=OBJECT_ID('WOA')) BEGIN ALTER table [WOA] add WOAServedStatus INT NULL END --增加一个约束 IF NOT EXISTS... 阅读全文