为表或者表字段添加扩展属性（MS_Description、sp_addextendedproperty、注释）

sp_addextendedproperty (Transact-sql) - SQL Server | Microsoft Docs

A.将扩展属性添加到表中

Address 下面的示例将扩展属性添加到 Person 架构中的Address表。

USE AdventureWorks2012;  
GO  
EXEC sys.sp_addextendedproperty   
@name = N'MS_DescriptionExample',   
@value = N'Street address information for customers, employees, and vendors.',   
@level0type = N'SCHEMA', @level0name = 'Person',  
@level1type = N'TABLE',  @level1name = 'Address';  
GO

B. 将扩展属性添加到表中的列

PostalCode 以下示例将扩展属性添加到Person 架构中 Address表中的PostalCode列。

USE AdventureWorks2012;  
GO  
EXEC sp_addextendedproperty   
@name = N'MS_DescriptionExample',   
@value = 'Postal code is a required column.',  
@level0type = N'Schema', @level0name = 'Person',  
@level1type = N'Table',  @level1name = 'Address',  
@level2type = N'Column', @level2name = 'PostalCode';  
GO