如何在另一列中显示最大日期金额？

Posted 2021-03-19

我想根据最新日期记录ADULT_AMT将MSP_ADULT和MSP_CHILD列驱动在MSP_ADULT中，将CHILD_AMT驱动在MSP_CHILD列中。

我想像下面这样出去。

END_DATE    ADULT_AMT  CHILD_AMT  MSP_ADULT  MSP_CHILD
09/01/2017   100          50           180       80
10/01/2018   200          100          180       80 
04/05/2019   300          90           180       80
08/20/2019   180          80           180       80

这是我正在运行的代码，但不起作用。

SELECT  
    AL1.END_DATE as BROCHURE_EFFECTIVE_END_DATE, 
    PORT_CODE,
    AL7.PRODUCT_LEGACY_CODE as COMPONENT_CODE, 
    AL3.PRICE_GUEST_AGE_GROUP ,
    MAX(CASE WHEN AL3.PRICE_GUEST_AGE_GROUP = 'ADULT' THEN AL3.PRICE_AMOUNT ELSE 0 END) ADULT_AMT, 
    MAX(CASE WHEN AL3.PRICE_GUEST_AGE_GROUP = 'CHILD' THEN AL3.PRICE_AMOUNT ELSE 0 END) CHILD_AMT,     
   MAX(CASE WHEN AL3.PRICE_GUEST_AGE_GROUP = 'ADULT' THEN AL3.PRICE_AMOUNT ELSE 0 END) 
            OVER (PARTITION BY PORT_CODE, AL7.PRODUCT_LEGACY_CODE --order by AL1.END_DATE desc
    )AS MSP_ADULT,
   MAX(CASE WHEN AL3.PRICE_GUEST_AGE_GROUP = 'CHILD' THEN AL3.PRICE_AMOUNT ELSE 0 END) 
            OVER (PARTITION BY PORT_CODE, AL7.PRODUCT_LEGACY_CODE order by AL1.END_DATE desc  ) AS MSP_child       
FROM RATE_PLAN AL1
inner join PRICE AL3
on (AL3.RATE_PLAN_SK=AL1.RATE_PLAN_SK and AL3.rate_plan_sk <>-1 )
Inner join PRODUCT_VARIANT AL7
ON (AL3.PRODUCT_CODE = AL7.PRODUCT_LEGACY_CODE and AL7.CATALOG_VERSION='Online')
INNER JOIN PRODUCT_OFFERING AL14
ON (AL14.PRODUCT_CODE = AL7.PRODUCT_LEGACY_CODE and AL7.CATALOG_VERSION='Online')
inner join PORT 
on (AL7.FULFILLMENT_LOCATION = PORT_CODE)
where  TO_CHAR(AL1.END_DATE,'YYYY') >= TO_CHAR(SYSDATE,'YYYY')
  and AL3.use_for_pricing_flag is not null
and port_code='HKT' and AL7.product_LEGACY_code='PK83'
GROUP BY        
        PORT_CODE,
        PRICE_GUEST_AGE_GROUP,
        AL7.PRODUCT_LEGACY_CODE,
        AL1.END_DATE

)

答案

因此，您需要这些条件MAX的最后一个值。

尝试按降序排列FIRST_VALUE。

...
FIRST_VALUE(ADULT_AMT) 
        OVER (PARTITION BY PORT_CODE, COMPONENT_CODE ORDER BY BROCHURE_EFFECTIVE_END_DATE DESC) AS MSP_ADULT,
FIRST_VALUE(CHILD_AMT)
        OVER (PARTITION BY PORT_CODE, COMPONENT_CODE ORDER BY BROCHURE_EFFECTIVE_END_DATE DESC) AS MSP_CHILD       
...

请注意，还有LAST_VALUE窗口功能，但有时可能会产生误导。