SQLSERVER操作字段约束，修改字段名称等

-- 表加注释
EXEC sys.sp_addextendedproperty @name=N'MS_Description', @value=N'注释内容' , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'表名'EXEC sys.sp_addextendedproperty @name=N'