查看库中表的主键，标识列，计算列，字段类型，允许空，默认值等属性

            SELECT
            [表名]=CASE WHEN T.column_id = 1 THEN OBJECT_NAME(T.object_id) ELSE ‘‘ END ,
            [字段编号]=T.column_id,
            [字段名]=T.name,
            [主键]=case when exists(SELECT 1 FROM sys.key_constraints  where type=‘PK‘ and object_id=T.OBJECT_ID) THEN ‘●‘ ELSE ‘‘ END,
            [标识列]=CASE T.is_identity  WHEN 1 THEN ‘●‘ ELSE ‘‘ END,
            [计算列]=CASE T.is_computed WHEN 1 THEN ‘●‘ ELSE ‘‘ END,
            [字段类型]=(SELECT name FROM sys.types WHERE user_type_id = T.user_type_id),
            [字段长度]= T.PRECISION,
            [小数位] = T.Scale,
            [允许空] = CASE T.is_nullable  WHEN 1 THEN ‘●‘ ELSE ‘‘ END,
            [默认值]= ISNULL((SELECT definition from sys.default_constraints where object_id = T.default_object_id),‘‘),
            [字段说明]=(SELECT VALUE FROM sys.extended_properties WHERE major_id = T.OBJECT_ID AND minor_id  =T.column_id)
            FROM sys.COLUMNS T
            INNER JOIN sys.objects O ON T.object_id = O.object_id AND O.type = ‘U‘
            WHERE RIGHT(OBJECT_NAME(T.object_id),3) <> ‘Log‘ AND OBJECT_NAME(T.object_id) <>‘AuditDDLEvents‘ AND OBJECT_NAME(T.object_id) <>‘dtproperties‘
            ORDER BY OBJECT_NAME(T.object_id),T.column_id