Question

我正在尝试选择一行，这些行具有（某些指定的）与前一行相同的值。

我可以选择以下内容：

SELECT dpr_ts
       , dpr_open
       , dpr_volume
       , LAG(dpr_open, 1, 0) over(ORDER BY dpr_ts) AS po
       , LAG(dpr_close, 1, 0) over(ORDER BY dpr_ts) AS pc
       , LAG(dpr_volume, 1, 0) over(ORDER BY dpr_ts) AS pv
  FROM dpr
 ORDER BY dpr_ts;

如何在where子句中指定只显示重复项？

我的意思是我想要一些像这样的东西，但只是为了让你知道我正在尝试的东西：

SELECT dpr_ts
      , dpr_open
      , dpr_volume
      , LAG(dpr_open, 1, 0) over(ORDER BY dpr_ts) AS po
where po = dpr_volume;

由于问候

Answer 1

我认为你想要的是：

select *
  from (
    select dpr_ts
         , dpr_open
         , dpr_volume
         , LAG(dpr_open, 1, 0) over(ORDER BY dpr_ts) AS po
      from dpr
     order by drp_ts
    ) x
where x.po = x.dpr_volume

将行与prev行进行比较

1 个答案: