带子查询的内部联接上的DB2 SQL语法

Question

I am not very well versed in SQL but my syntax seem correct and I am getting "TDEST.ENDZONE is not valid in the context where it is used" and didn't find much info on inner joins with subquery so far.

    select * from LYNX.LEGSUM T2 inner join
(    SELECT
      TLORDER.END_ZONE,LEGSUM.LS_DRIVER, LEGSUM.LS_POWER_UNIT
    FROM
      LYNX.LEGSUM LEGSUM
      LEFT OUTER JOIN LYNX.TLORDER TLORDER ON LEGSUM.LS_DLID = TLORDER.DETAIL_LINE_ID
    WHERE
      TLORDER.ORIGIN = 'PRO8060'
      AND LEGSUM.LS_ACTUAL_DATE >= '2017-01-01 00:00:00'
      AND LEGSUM.LS_ACTUAL_DATE < '2018-01-01 00:00:00'
      AND NOT (
        TLORDER.CURRENT_STATUS = 'CANCEL'
        OR TLORDER.CURRENT_STATUS = 'CANCL'
        OR TLORDER.CURRENT_STATUS = 'ENTRY'
      )
) TDEST
ON TDEST.ENDZONE = T2.LEGSUM.LS_FROM_ZONE
AND TDEST.LS_DRIVER = T2.LS_DRIVER
AND TDEST.LS_POWER_UNIT = T2.LS_POWER_UNIT

If any explanation are needed, what I am trying to achieve is to get a data set from my LEGSUM table that correspond to the result of my subquery wich will then be used to filter more data using "IN" function

Thank you for any and all help

Answer 1

Reconsider the use of a subquery since outer and subquery share same source table, LYNX.LEGSUM , at unit level. Consider incorporating a self-join on this same table:

SELECT l2.*
FROM
  LYNX.LEGSUM l
LEFT OUTER JOIN LYNX.TLORDER t
  ON l.LS_DLID = t.DETAIL_LINE_ID
INNER JOIN LYNX.LEGSUM l2
  AND l2.LS_FROM_ZONE = t.END_ZONE
  AND l2.LS_DRIVER = l.LS_DRIVER
  AND l2.LS_POWER_UNIT = l.LS_POWER_UNIT

WHERE
  t.ORIGIN = 'PRO8060'
  AND l.LS_ACTUAL_DATE >= '2017-01-01 00:00:00'
  AND l.LS_ACTUAL_DATE < '2018-01-01 00:00:00'
  AND NOT (
    t.CURRENT_STATUS = 'CANCEL'
    OR t.CURRENT_STATUS = 'CANCL'
    OR t.CURRENT_STATUS = 'ENTRY'
  )

Answer 2

您在ON子句中使用的END_ZONE中缺少下划线