WITH AS短语，也叫做子查询部分（subquery factoring）

可以让你做很多事情，定义一个SQL片断，该SQL片断会被整个SQL语句所用到。

作为提供数据的部分。

代码例子：

 with temp as
  (select ID, Type_Name, Type_ID
     from T_Base_GoodsType as t
    where t.Shop_ID = @shop_id
      and Type_ID = @Goods_TypeID
   union all
   select t1.ID, t1.Type_Name, t1.Type_ID
     from T_Base_GoodsType as t1
    inner join temp
       on t1.ParentType_ID = temp.Type_ID
    where t1.Shop_ID = @shop_id)
 select *
   from (select Stock_Amount,
                S.StockWarn_Amount,
                S.All_Amount,
                G.Goods_ID,
                G.Goods_Name,
                G.Goods_Unit,
                ROW_NUMBER() over(order by Stock_Amount desc) as rowid
           from T_IM_StockInfo as S
          inner join T_Base_GoodsInfo AS G
             on S.Goods_ID = G.Goods_ID
          inner join temp
             on temp.Type_ID = G.Goods_TypeID
          where S.Shop_ID = @shop_id
            AND G.Shop_ID = @shop_id
            and G.Goods_TypeID = temp.Type_ID
          group by S.Stock_Amount,
                   S.All_Amount,
                   G.Goods_ID,
                   G.Goods_Name,
                   G.Goods_Unit,
                   S.StockWarn_Amount
         HAVING SUM(S.Stock_Amount) < S.StockWarn_Amount) m
  WHERE rowid between @pageindex and @pagesize

参考：sql with as 用法