EXEC sys.sp_addextendedproperty @name=N'<NameOfProp>',@value=N'<Value>',@level0type=N'SCHEMA',@level0name=N'dbo',@level1type=N'TABLE',@level1name=N'<Table>'

您可以更新它们：

EXEC sys.sp_updateextendedproperty 
   @name=N'MS_Description',@value=N'My Description',@level1name=N'<YOUR TABLE NAME>'

你可以读取它们：

SELECT *
FROM fn_listextendedproperty (NULL,'schema','dbo','table','<yourtable>',default,default);

要么

SELECT
p.name AS [Name],p.value
FROM
sys.tables AS tbl
INNER JOIN sys.extended_properties AS p ON p.major_id=tbl.object_id AND p.minor_id=0 AND p.class=1
WHERE
(tbl.name=N'<yourtablename>' and SCHEMA_NAME(tbl.schema_id)=N'dbo')
ORDER BY
[Name] ASC