SELECT 
t.[name] AS 表名,
c.[name] AS 字段名,
cast(ep.[value] as nvarchar(200)) AS [字段说明]  
FROM sys.tables AS t  
INNER JOIN sys.columns   
AS c ON t.object_id = c.object_id  
 LEFT JOIN sys.extended_properties AS ep   
ON ep.major_id = c.object_id AND ep.minor_id = c.column_id WHERE ep.class =1   
AND t.name='T_BrokerWithLook'