Oracle SQL 查询结果存入临时表以供子查询使用答案

【问题标题】：Oracle SQL query result into a temporary table for use in a sub queryOracle SQL 查询结果存入临时表以供子查询使用
【发布时间】：2015-05-14 04:19:25
【问题描述】：

我想创建一个临时表，该表又从一个查询派生以用于另一个子查询，以简化 rownum() 和按条件分区。我输入的查询如下，但它返回一个错误 t.trlr_num 无效标识符。

with t as
(select distinct
          ym.trlr_num,
           ym.arrdte,
           ri.invnum,
           ri.supnum
from rcvinv ri, yms_ymr ym
where ym.trlr_cod='RCV'
and ri.trknum = ym.trlr_num
and ym.wh_id <=50
and ym.trlr_stat in ('C','CI','R','OR')
and ym.arrdte is not null
order by ym.arrdte desc
)
select trlr_number, invnum, supnum
from
(
  select 
    t.trlr_num, t.invnum, t.supnum,
    row_number() over (partition by t.trlr_number,t.invnum order by t.arrdte) as rn 
  from t
)
where rn = 1;

从上面，我设置了一个条件来创建一个表 t 作为临时表，以便在下面的 select 语句中使用。但它似乎因标识符无效而出错。

【问题讨论】：

标签： sql oracle temp-tables

【解决方案1】：

似乎是错字，用 trlr_num 替换 trlr_number 就可以了

with t as
(select distinct
          ym.trlr_num,
           ym.arrdte,
           ri.invnum,
           ri.supnum
from rcvinv ri, yms_ymr ym
where ym.trlr_cod='RCV'
and ri.trknum = ym.trlr_num
and ym.wh_id <=50
and ym.trlr_stat in ('C','CI','R','OR')
and ym.arrdte is not null
order by ym.arrdte desc
)
select trlr_num, invnum, supnum
from
(
  select 
    t.trlr_num, t.invnum, t.supnum,
    row_number() over (partition by t.trlr_num,t.invnum order by t.arrdte) as rn 
  from t
)
where rn = 1;

【讨论】：

【解决方案2】：

您可以在 WITH 子句中使用多个子查询作为单独的临时表。这将是很好且易于理解的：

WITH t AS
  (SELECT DISTINCT ym.trlr_num trlr_num,
    ym.arrdte arrdte,
    ri.invnum invnum,
    ri.supnum supnum
  FROM rcvinv ri,
    yms_ymr ym
  WHERE ym.trlr_cod ='RCV'
  AND ri.trknum     = ym.trlr_num
  AND ym.wh_id     <=50
  AND ym.trlr_stat IN ('C','CI','R','OR')
  AND ym.arrdte    IS NOT NULL
  ),
  t1 AS (
  SELECT t.trlr_num,
  t.arrdte,
  t.invnum,
  t.supnum,
  row_number() OVER (PARTITION BY t.trlr_num, t.invnum ORDER BY t.trlr_num, t.invnum DESC) rn
  FROM t
  )
SELECT trlr_num, arrdte, invnum, supnum 
   FROM t1 
  WHERE rn = 1;

【讨论】：