DB2SQL查询以组合多个子行以在单行中显示 我正在尝试构建查询。我有一个父表，每个帐户都有唯一的行。子表将对父表上的每一行有多个行。子桌和父桌...

Question

ROW_ID     CRD_DB_YN    AMT   CODE
1234563         D       100     A
1234563         D       200     C
1234563         C       300     D
1234564         D       100     X
1234565         D       250     A
1234565         C       300     C

我希望从下面的查询中输出输出。

ROW_ID   ACCT     CRD_DB_YN   AMT    CODE  CRD_DB_YN   AMT    CODE  CRD_DB_YN   AMT    CODE
1234563   333555        D      100      A      D        200      C      C      300       D
1234564   333666        D      100      X 
1234565   333777        D      250      A      C        300      C

在情况下，您的孩子级别是固定的，您可以首先根据Row_ID对孩子进行排名，然后根据等级对每个等级重复列CRD_DB_YN，AMT和代码。

WITH rank_child AS (
  SELECT
    p.ROW_ID AS P_ROW_ID,
    p.ACCT,
    c.ROW_ID AS C_ROW_ID,
    c.CRD_DB_YN,
    c.AMT,
    c.CODE,
    ROW_NUMBER() OVER (PARTITION BY c.ROW_ID ORDER BY c.ROW_ID) AS rn
  FROM
    parent p
  INNER JOIN
    child c
  ON
    p.ROW_ID = c.ROW_ID
)
SELECT
  rc.P_ROW_ID AS ROW_ID,
  rc.ACCT,
  MAX(CASE WHEN rc.rn = 1 THEN rc.CRD_DB_YN END) AS CRD_DB_YN1,
  MAX(CASE WHEN rc.rn = 1 THEN rc.AMT END) AS AMT1,
  MAX(CASE WHEN rc.rn = 1 THEN rc.CODE END) AS CODE1,
  MAX(CASE WHEN rc.rn = 2 THEN rc.CRD_DB_YN END) AS CRD_DB_YN2,
  MAX(CASE WHEN rc.rn = 2 THEN rc.AMT END) AS AMT2,
  MAX(CASE WHEN rc.rn = 2 THEN rc.CODE END) AS CODE2,
  MAX(CASE WHEN rc.rn = 3 THEN rc.CRD_DB_YN END) AS CRD_DB_YN3,
  MAX(CASE WHEN rc.rn = 3 THEN rc.AMT END) AS AMT3,
  MAX(CASE WHEN rc.rn = 3 THEN rc.CODE END) AS CODE3
FROM
  rank_child rc
GROUP BY
  rc.P_ROW_ID, rc.ACCT
ORDER BY
  rc.P_ROW_ID;

输出

Fiddle

Answer 1

row_idACCT

CRD_DB_YN1

AMT1

code1

CRD_DB_YN2AMT2code2CRD_DB_YN3AMT3code31234563333555 d200d100X null null null null1234565333777 null null

								d	100	a
c	c	300	d		1234564	333666			null	null
			d	250	a	c	300	c	null