Question

当我使用此查询时，

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;

它给出了这样的输出：

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

但我希望输出看起来像这样：

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

对于每个收据，印章值应仅打印一次＆gt; 5000。

（*单个收据可能包含一个或多个trx_num *）

请帮我解决这个问题。

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，我更新了我的连接查询，其中我添加了分区，但错误是错误的关键字。可以有人编辑这个以获得所需的输出

Answer 1

因此，您希望组中第一行的stamp_value为1，后续所有行为NULL？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

这会将第一行的stamp_value设置为1（使用trx_num进行排序），并为所有后续行设置NULL。

Answer 2

试试这个

 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

Answer 3

您是否可以在select语句中包含receipt_amount以进行检查？可能是您对receipt_amount的期望不正确，并且脚本行为正确。

另外，你的null不应该在case语句中用单引号，你将在结果集中得到一个字符串而不是null值，就像你期望的那样。

SQL查询无法获得所需的输出

3 个答案: