如何在选择多列的单列中显示 select 个唯一值？

Question

该查询实际上很好并且正在运行，但它与 A.CONTRACT_NUMBER 列不同 select。

这是代码：

SELECT DISTINCT A.CONTRACT_NUMBER
, A.DTIME_SIGNATURE
, A.ID_CUID
, A.CLIENT_SEGMENT
, A.CLIENT_GENDER
, A.CLIENT_AGE
, A.CNT_SIGNED
, A.AMT_SIGNED
, A.INSTALMENTS
, A.PRODUCT
, B.AMT_INTEREST_INCOME
  FROM DM_SALES.V_SALES_DM_DATA A
  LEFT JOIN DM_FIN.FIN_LTV_DATAMART B ON A.CONTRACT_NUMBER = B.CONTRACT_NUMBER
  WHERE 1=1
  AND A.CONTRACT_STATE <> 'Cancelled' 
  AND a.cnt_signed=1 
  AND A.LOAN_TYPE = 'Consumer Loan'
  AND (TRUNC(A.DTIME_SIGNATURE) BETWEEN DATE'2022-08-01' AND DATE '2022-08-31')
  GROUP BY A.CONTRACT_NUMBER
  ORDER BY A.DTIME_SIGNATURE
;

运行正常，但查了下数据，A.CONTRACT_NUMBER列还是有重复的值。 A.CONTRACT_NUMBER 就像主键列，我想为该列添加 select 个唯一值

感谢：D

Answer 1

对于每个合同，您需要数据集市表中的平均利息收入，因此按合同聚合数据集市数据并将此结果加入您的销售额 data.table。

SELECT
  sd.*,
  dm.avg_interest_income
FROM dm_sales.v_sales_dm_data sd
LEFT JOIN 
(
  SELECT contract_number, AVG(amt_interest_income) AS avg_interest_income
  FROM dm_fin.fin_ltv_datamart
  GROUP BY contract_number
) dm ON dm.contract_number = sd.contract_number
WHERE sd.contract_state <> 'Cancelled' 
  AND sd.cnt_signed = 1 
  AND sd.loan_type = 'Consumer Loan'
  AND sd.dtime_signature >= DATE '2022-08-01'
  AND sd.dtime_signature < DATE '2022-09-01'
ORDER BY sd.dtime_signature;