Question

我有两张表如下：

loy_credits_ledger

+-----------------+------------------+-----------------+-----------------+
| CRL_OUTLET_CODE | CRL_REDEEM_MONTH | crl_redeem_year | CRL_RM_REDEEMED |
+-----------------+------------------+-----------------+-----------------+
|       144000581 | APR              |            2014 | 273.3           |
|       144000581 | JUL              |            2014 | 194.1           |
|       144000581 | OCT              |            2014 | 216.3           |
|       144000581 | JAN              |            2015 | 24.9            |
|       144000581 | JAN              |            2015 | 177.1           |
+-----------------+------------------+-----------------+-----------------+

jti_qtr_credit_data

+-----------------+----------+-------------+------------+------------+---------------------+
| QCD_OUTLET_CODE | QCD_YEAR | QCD_QUARTER | QCD_CREDIT | QCD_POINTS | QCD_CREDITS_BALANCE |
+-----------------+----------+-------------+------------+------------+---------------------+
|       144000581 |     2014 | Q1          | 273.3      |      54660 |                   0 |
|       144000581 |     2014 | Q2          | 194.1      |      38820 |                   0 |
|       144000581 |     2014 | Q3          | 378.8      |      75760 |                   0 |
|       144000581 |     2014 | Q4          | 202        |      40400 |                   0 |
|       144000581 |     2015 | Q1          | 321.55     |      64310 |                   0 |
+-----------------+----------+-------------+------------+------------+---------------------+

我需要在某些条件下加入这两个表。除了凌乱的桌子结构（我的控制之外），我设法让我的结果几乎正确。基本上，这是我的目标：

+-----------------+----------+-------------+------------+------------+--------------+---------------------+
| QCD_OUTLET_CODE | QCD_YEAR | QCD_QUARTER | QCD_POINTS | QCD_CREDIT | QCD_REDEEMED | QCD_CREDITS_BALANCE |
+-----------------+----------+-------------+------------+------------+--------------+---------------------+
|       144000581 |     2014 | Q2          |      38820 | 194.1      | 194.1        | 0                   |
|       144000581 |     2014 | Q4          |      40400 | 202        | 202          | 0                   |
|       144000581 |     2014 | Q1          |      54660 | 273.3      | 273.3        | 0                   |
|       144000581 |     2014 | Q3          |      75760 | 378.8      | 216.3        | 162.5               |
+-----------------+----------+-------------+------------+------------+--------------+---------------------+

它只缺少第五条记录，只出现在 jti_qtr_credit_data 中。

我使用脚本做到了：

SELECT Q.QCD_OUTLET_CODE,  Q.QCD_YEAR, Q.QCD_QUARTER, Q.QCD_POINTS, Q.QCD_CREDIT,   nvl(SUM(L.REDEEMED), 0) AS QCD_REDEEMED, Q.QCD_CREDIT - NVL(SUM(L.REDEEMED),0) AS QCD_CREDITS_BALANCE
FROM 
(SELECT 
(case when CRL_REDEEM_MONTH = 'JAN' Then 'Q4'
              when CRL_REDEEM_MONTH = 'FEB' Then 'Q4'
              when CRL_REDEEM_MONTH = 'MAR' Then 'Q4'
              when CRL_REDEEM_MONTH = 'APR' Then 'Q1'
              when CRL_REDEEM_MONTH = 'MAY' Then 'Q1'
              when CRL_REDEEM_MONTH = 'JUN' Then 'Q1'
              when CRL_REDEEM_MONTH = 'JUL' Then 'Q2'
              when CRL_REDEEM_MONTH = 'AUG' Then 'Q2'
              when CRL_REDEEM_MONTH = 'SEP' Then 'Q2'
              when CRL_REDEEM_MONTH = 'OCT' Then 'Q3'
              when CRL_REDEEM_MONTH = 'NOV' Then 'Q3'
              when CRL_REDEEM_MONTH = 'DEC' Then 'Q3'
              ELSE NULL END) QUARTER, 

              (case 
              when CRL_REDEEM_MONTH = 'JAN' Then crl_redeem_year-1
              when CRL_REDEEM_MONTH = 'FEB' Then crl_redeem_year-1
              when CRL_REDEEM_MONTH = 'MAR' Then crl_redeem_year-1
              when CRL_REDEEM_MONTH = 'APR' Then crl_redeem_year
              when CRL_REDEEM_MONTH = 'MAY' Then crl_redeem_year
              when CRL_REDEEM_MONTH = 'JUN' Then crl_redeem_year
              when CRL_REDEEM_MONTH = 'JUL' Then crl_redeem_year
              when CRL_REDEEM_MONTH = 'AUG' Then crl_redeem_year
              when CRL_REDEEM_MONTH = 'SEP' Then crl_redeem_year
              when CRL_REDEEM_MONTH = 'OCT' Then crl_redeem_year
              when CRL_REDEEM_MONTH = 'NOV' Then crl_redeem_year
              when CRL_REDEEM_MONTH = 'DEC' Then crl_redeem_year
              ELSE NULL END) redeem_year,

              CRL_OUTLET_CODE,  CRL_CREDITS_EARNED, NVL(CRL_RM_REDEEMED, 0) REDEEMED
FROM loy_credits_ledger
where TO_CHAR(crl_redeem_year) is not null
AND CRL_OUTLET_CODE = 144000581
--GROUP BY CRL_REDEEM_MONTH, crl_redeem_year, CRL_OUTLET_CODE, CRL_CREDITS_EARNED
) L
full outer JOIN jti_qtr_credit_data Q 
ON L.CRL_OUTLET_CODE = Q.QCD_OUTLET_CODE
AND L.redeem_year = Q.QCD_YEAR
AND L.QUARTER =  Q.QCD_QUARTER
AND L.CRL_OUTLET_CODE = 144000581
GROUP BY Q.QCD_OUTLET_CODE,  Q.QCD_YEAR, Q.QCD_QUARTER, Q.QCD_YEAR, Q.QCD_CREDIT, Q.QCD_POINTS;

现在，问题是，我尝试左和右加入。因为我有QCD_Quarter = Q1＆amp; QCD_Year = 2015 jti_qtr_credit_data ，但不在 loy_credits_ledger ;左边还是右边连接不应该显示空值的记录？

此问题是否与使用join的子查询有关？

Answer 1

在正常的 WHERE 条件中使用（+）符号告诉DB包含所有不匹配的行，其中包含NULL值;我设法得到了理想的结果。

以下是修改后的脚本：

SELECT Q.QCD_OUTLET_CODE,  Q.QCD_YEAR, Q.QCD_QUARTER, Q.QCD_POINTS, Q.QCD_CREDIT,   nvl(SUM(L.REDEEMED), 0) AS QCD_REDEEMED, Q.QCD_CREDIT - NVL(SUM(L.REDEEMED),0) AS QCD_CREDITS_BALANCE
FROM 
(SELECT 
(case when CRL_REDEEM_MONTH = 'JAN' Then 'Q4'
              when CRL_REDEEM_MONTH = 'FEB' Then 'Q4'
              when CRL_REDEEM_MONTH = 'MAR' Then 'Q4'
              when CRL_REDEEM_MONTH = 'APR' Then 'Q1'
              when CRL_REDEEM_MONTH = 'MAY' Then 'Q1'
              when CRL_REDEEM_MONTH = 'JUN' Then 'Q1'
              when CRL_REDEEM_MONTH = 'JUL' Then 'Q2'
              when CRL_REDEEM_MONTH = 'AUG' Then 'Q2'
              when CRL_REDEEM_MONTH = 'SEP' Then 'Q2'
              when CRL_REDEEM_MONTH = 'OCT' Then 'Q3'
              when CRL_REDEEM_MONTH = 'NOV' Then 'Q3'
              when CRL_REDEEM_MONTH = 'DEC' Then 'Q3'
              ELSE NULL END) QUARTER, 

              (case 
              when CRL_REDEEM_MONTH = 'JAN' Then crl_redeem_year-1
              when CRL_REDEEM_MONTH = 'FEB' Then crl_redeem_year-1
              when CRL_REDEEM_MONTH = 'MAR' Then crl_redeem_year-1
              when CRL_REDEEM_MONTH = 'APR' Then crl_redeem_year
              when CRL_REDEEM_MONTH = 'MAY' Then crl_redeem_year
              when CRL_REDEEM_MONTH = 'JUN' Then crl_redeem_year
              when CRL_REDEEM_MONTH = 'JUL' Then crl_redeem_year
              when CRL_REDEEM_MONTH = 'AUG' Then crl_redeem_year
              when CRL_REDEEM_MONTH = 'SEP' Then crl_redeem_year
              when CRL_REDEEM_MONTH = 'OCT' Then crl_redeem_year
              when CRL_REDEEM_MONTH = 'NOV' Then crl_redeem_year
              when CRL_REDEEM_MONTH = 'DEC' Then crl_redeem_year
              ELSE NULL END) redeem_year,

              CRL_OUTLET_CODE,  CRL_CREDITS_EARNED, NVL(CRL_RM_REDEEMED, 0) REDEEMED
FROM loy_credits_ledger
where TO_CHAR(crl_redeem_year) is not null
AND CRL_OUTLET_CODE = 144000581
--GROUP BY CRL_REDEEM_MONTH, crl_redeem_year, CRL_OUTLET_CODE, CRL_CREDITS_EARNED
) L
    ,
jti_qtr_credit_data q
where L.CRL_OUTLET_CODE(+) = Q.QCD_OUTLET_CODE
AND L.redeem_year(+) = Q.QCD_YEAR
AND L.QUARTER(+) =  Q.QCD_QUARTER
and q.QCD_OUTLET_CODE = 144000581
    GROUP BY Q.QCD_OUTLET_CODE,  Q.QCD_YEAR, Q.QCD_QUARTER, Q.QCD_YEAR, Q.QCD_CREDIT, Q.QCD_POINTS;

结果

+-----------------+----------+-------------+------------+------------+--------------+---------------------+
| QCD_OUTLET_CODE | QCD_YEAR | QCD_QUARTER | QCD_POINTS | QCD_CREDIT | QCD_REDEEMED | QCD_CREDITS_BALANCE |
+-----------------+----------+-------------+------------+------------+--------------+---------------------+
|       144000581 |     2014 | Q2          |      38820 | 194.1      | 194.1        | 0                   |
|       144000581 |     2014 | Q4          |      40400 | 202        | 202          | 0                   |
|       144000581 |     2014 | Q1          |      54660 | 273.3      | 273.3        | 0                   |
|       144000581 |     2014 | Q3          |      75760 | 378.8      | 216.3        | 162.5               |
|       144000581 |     2015 | Q1          |      64310 | 321.55     | 0            | 321.55              |
+-----------------+----------+-------------+------------+------------+--------------+---------------------+

此方法的灵感来自this和this条款。

右键加入，它是否适用于子查询oracle

1 个答案: