可以使用 JOIN ON 语法的内联视图吗？

Question

我有两个可以通过经典连接方法连接的内联视图。结果符合预期。

但是，尝试适应 JOIN ON 语法时，我看不出如何。限制？需要吗？或者需要创建两个单独的视图然后应用 - 我想会起作用。在这方面找不到任何东西。

观点如下，求BUY和SELL匹配

select BUY.*, SELL.* from (
select Z.*, 'LONG' from (
select X.commodity, X.market_place, X.max_qty, Y.maturity_dt, rank() over 
(partition by X.commodity, X.market_place order by y.maturity_dt ASC) as 
rank_val
  from
 (select commodity, market_place, max(qty) as max_qty
   from OPEN_POSITIONS
 where prod_type = 'future'
   and qty > 0
  group by commodity, market_place
 ) X,
  open_positions Y 
 where Y.qty = X.max_qty
   and Y.commodity = X.commodity
   and Y.prod_type = 'future'
   and Y.market_place = X.market_place ) Z
 where Z.rank_val = 1 ) BUY, 
  (
select Z.*, 'SHORT' from (
select X.commodity, X.market_place, X.min_qty, Y.maturity_dt, rank() over 
(partition by X.commodity, X.market_place order by y.maturity_dt ASC) as 
rank_val
  from
 (select commodity, market_place, min(qty) as min_qty
  from OPEN_POSITIONS
 where prod_type = 'future'
   and qty < 0
  group by commodity, market_place
 ) X,
  open_positions Y 
  where Y.qty = X.min_qty
   and Y.commodity = X.commodity
   and Y.prod_type = 'future'
   and Y.market_place = X.market_place ) Z
where Z.rank_val = 1) SELL
where BUY.commodity = SELL.commodity
  and BUY.market_place = SELL.market_place

Answer 1

您可以根据数据库尝试如下操作。

  ;With AllData AS 
  (
        select commodity, market_place, qty
            from OPEN_POSITIONS
        where prod_type = 'future'
  ),
  X AS 
  (
    SELECT
        commodity, market_place, max(qty) as max_qty
    FROM    AllData
    WHERE  qty > 0
    group by commodity, market_place
  ),
  Z AS
  (
    SELECT
        X.commodity, X.market_place, X.max_qty, Y.maturity_dt, rank() over 
        (partition by X.commodity, X.market_place order by y.maturity_dt ASC) as rank_val
    FROM  AllData  Y  INNER JOIN X ON Y.qty = X.max_qty   AND   Y.commodity = X.commodity AND Y.market_place = X.market_place
  ),
  BUY  AS
  (
    SELECT
        commodity, market_place, max_qty, maturity_dt,rank_val
    FROM Z
    WHERE rank_val = 1
  ),
   A AS 
  (
    SELECT
        commodity, market_place, max(qty) as max_qty
    FROM    AllData
    WHERE  qty <  0
    group by commodity, market_place
  ),
  B AS
  (
    SELECT
        A.commodity, A.market_place, A.max_qty, Y.maturity_dt, rank() over 
        (partition by A.commodity, A.market_place order by y.maturity_dt ASC) as rank_val
    FROM  AllData  Y  INNER JOIN A ON Y.qty = A.max_qty   AND   Y.commodity = A.commodity AND Y.market_place = A.market_place
  ),
  SELL  AS
  (
    SELECT
        commodity, market_place, max_qty, maturity_dt,rank_val
    FROM B
    WHERE rank_val = 1
  )
  SELECT
    bu.*;sl.*
  FROM  BUY bu INNER JOIN SELL AS sl  ON bu.commodity = sl.commodity
  and bu.market_place = sl.market_place

Answer 2

不可以，需要先看一下

可以使用 JOIN ON 语法的内联视图吗？

Inline Views with JOIN ON syntax possible?

sql

join

inline

view