SQL查詢不能得到期望的輸出

Question

當我使用此查詢，

select 
    receipt_num, trx_num, 
    (case when receipt_amount > 5000 then '1' else 'null') as stamp_value,receipt_amount 
from ra_customer_all where receipt_amount > 5000; 

它給輸出LIK這樣的：

receipt_num    trx_num   stamp_value  receipt_amount 
    23679    sf35fd     1    5400 
    23679    sdf2424    1    5400 
    23679    rer434     1    5400 
    987444    dgd343     1    98432 
    7610    sdf23     1    6756 
    7610    dfg242     1    6756 

但我想輸出看起來像這樣：

receipt_num  trx_num  stamp_value  receipt_amount 
    23679   sf35fd    1     5400 
    23679   sdf2424   null    5400 
    23679   rer434    null    5400 
987444   dgd343    1     98432 
    7610   sdf23    1     6756 
    7610   dfg242    null    6756 

如果每張收據num> 5000，郵票值只應打印一次。

（*單個收據可能包含一個或多個trx_num *）

請幫我這個。

select 
acra.attribute6 office_code, 
acra.attribute5 collection_number, 
acra.receipt_number instrument_number, 
acra.receipt_date collection_date, 
acra.amount collected_amount, 
ac.customer_name, 
rcta.trx_number , 
(case row_number() over (partition by acra.receipt_number order by rcta.trx_number) when acra.amount > 5000 then '1' else 'NULL' end) stamp_value, 
from 
ar_cash_receipts_all acra, 
ar_customers ac, 
ra_customer_trx_all rcta, 
ar_receivable_applications_all araa 
where 
acra.pay_from_customer=ac.customer_id and 
acra.cash_receipt_id = araa.cash_receipt_id and 
araa.applied_customer_trx_id=rcta.customer_trx_id 
and acra.amount > 5000 

好吧，我更新我的加盟，我通過添加分區，但給人錯誤失蹤keyword.Can人編輯此爲所需的輸出

Answer 1

所以你想stamp_value爲1組的第一行和NULL爲所有後續行？使用PARTITION BY：

select 
    receipt_num, trx_num, 
    (case row_number() over (partition by receipt_num order by trx_num) 
    when 1 then 1 
    else NULL 
    end) stamp_value, 
    receipt_amount 
from ra_customer_all 
where receipt_amount > 5000 

這將設置stamp_value爲1的第一行（使用trx_num排序）和NULL對於所有後續行。

Answer 2

可以通過同時包括在你的SELECT語句receipt_amount開始查詢檢查目的？這可能是因爲您對receipt_amount的期望不正確，並且腳本的行爲正確。

此外，您的null不應該在case語句中使用單引號，您將在結果集中獲得一個字符串，而不是null值，正如您所期望的那樣。

Answer 3

試試這個

select receipt_num,trx_num, result= 
case when receipt_amount >500 then 1 else null end,receipt_amount from ra_customer_all 

演示 http://sqlfiddle.com/#!3/f29a6/1

http://sqlfiddle.com/#!3/f29a6/2