SELECT CASE WHEN col.colorder = 1 THEN obj.name ELSE '' END AS 表名, Coalesce(epTwo.value, '') AS documentation, col.colorder AS 序号 , col.name AS 列名 , ISNULL(ep.[value], '') AS 列说明 , t.name AS 数据类型 , col.length AS 长度 , ISNULL(COLUMNPROPERTY(col.id, col