4

假设，我有一个表 ClientTrade，如下所示：

ClientName , TradeDate , Quantity

我想在 Oracle PLSQL 中创建一个查询，它应该返回如下结果：（天数来自 TradeDate 列，Mon = sum(Quantity) for Mon，Tue = sum(Quantity) for Tue ... 等等。 )

ClientName  Mon Tue Wed Thu Fri Sat Sun TotalForWeek
ABC         10  15  5   2   4   0   0   34
XYZ         1   1   2   1   2   0   0   7

假设此报告将始终具有使其运行一周的 where 条件，是否可以在单个查询中创建它？

4

5 回答 5

6

稍微简化一下...

SELECT ClientName, 
       SUM(CASE WHEN to_char(TradeDate,'DY')='MON' THEN Quantity ELSE NULL END) AS Mon,
       SUM(CASE WHEN to_char(TradeDate,'DY')='TUE' THEN Quantity ELSE NULL END) AS Tue,
       SUM(CASE WHEN to_char(TradeDate,'DY')='WED' THEN Quantity ELSE NULL END) AS Wed,
       SUM(CASE WHEN to_char(TradeDate,'DY')='THU' THEN Quantity ELSE NULL END) AS Thu,
       SUM(CASE WHEN to_char(TradeDate,'DY')='FRI' THEN Quantity ELSE NULL END) AS Fri,
       SUM(CASE WHEN to_char(TradeDate,'DY')='SAT' THEN Quantity ELSE NULL END) AS Sat,
       SUM(CASE WHEN to_char(TradeDate,'DY')='SUN' THEN Quantity ELSE NULL END) AS Sun,
       SUM(Quantity) AS TotalForWeek
FROM  ClientTrade
GROUP BY ClientName
于 2009-05-22T05:10:13.770 回答
3

子查询。

select ClientName, 
(select sum(b.quantity) 
from table b where b.clientName = a.clientname 
and b.tradedate = [some constant or calculation that identifies monday])  
as Mon,
(select sum(b.quantity) 
from table b where b.clientName = a.clientname 
and b.tradedate = [some constant or calculation that identifies tuesday])  
as Tue,

..etc..
from table a

一种更清洁但可能效率较低的方法涉及带有 group by:ew 的视图

create view quantityperday as
select clientname, 
tradedate, 
dayofweek(tradedate) as dow, 
weekofyear(tradedate) as woy, 
year(tradedate) as y,
sum(quantity) as quantity
from table 
group by clientname, tradedate;

然后：

select clientname, b.quantity as Mon, c.quantity as Tue ....
from table a join quantityperday b 
on (a.clientname = b.clientname and b.y = '2008'
and b.doy = 2 and b.dow = 'Monday')
quantityperday c 
on (a.clientname = c.clientname and c.y = '2008'
and c.doy = 2 and c.dow = 'Tuesday')
join ....

这变得丑陋的原因是我们将行旋转为列。

于 2009-04-22T05:34:34.827 回答
2

让我们来看看：

SELECT Client, MonSum, TueSum, WedSum, ThuSum, FriSum, SatSum, SunSum, TotSum
    FROM (SELECT ClientName AS Client, SUM(Quantity) AS MonSum
             FROM Trades
             WHERE DayOfWeek(TradeDate) = 'Monday'
               AND TradeDate BETWEEN DATE '..Monday..' AND DATE '..Sunday..'
             GROUP BY ClientName
         ) AS MonData
         JOIN
         (SELECT ClientName AS Client, SUM(Quantity) AS TueSum ...
         ) AS TueData ON Mondata.Client = TueData.Client
         JOIN
         ...
         (SELECT ClientName AS Client, SUM(Quantity) AS TotSum
             FROM Trades
             WHERE TradeDate BETWEEN DATE '..Monday..' AND DATE '..Sunday..'
             GROUP BY ClientName
         ) AS TotData ON MonData.Client = TotData.Client
    ORDER BY Client;

不整洁，但正如@tpdi 在他的回答中提到的那样，那是因为我们将行旋转为列。我已经使用了一致的TradeDate BETWEEN ...条款来涵盖相关的一周。

于 2009-04-22T05:47:02.707 回答
0

感谢您的回答。实际上，我在 plsql 中发现了一些效果很好的东西：

select clientname,
max(decode(trim(dow),'MONDAY',totalquantity,0)) Mon,
max(decode(trim(dow),'TUESDAY',totalquantity,0)) Tue,
max(decode(trim(dow),'WEDNESDAY',totalquantity,0)) Wed,
max(decode(trim(dow),'THURSDAY',totalquantity,0)) Thu,
max(decode(trim(dow),'FRIDAY',totalquantity,0)) Fri,
(
max(decode(trim(dow),'MONDAY',totalquantity,0)) +
max(decode(trim(dow),'TUESDAY',totalquantity,0)) +
max(decode(trim(dow),'WEDNESDAY',totalquantity,0)) +
max(decode(trim(dow),'THURSDAY',totalquantity,0)) +
max(decode(trim(dow),'FRIDAY',totalquantity,0)) 
) TOTAL
from 
(
  select clientname, 
  to_char(tradedate, 'DAY') as dow, 
  sum(quantity) as totalquantity
  from ClientTrade a
  where a.tradedate >= trunc(sysdate-7,'D')
  and a.tradedate <= trunc(sysdate-7,'D') + 4
  group by c.clientshortname, tradedate
)
group by clientname
于 2009-04-22T09:44:06.520 回答
0

我在 Oracle 11G 上的尝试：

select clientname, nvl(MON,0) MON,  nvl(TUE,0) TUE, nvl(WED,0) WED, nvl(THU,0) THU, nvl(FRI,0) FRI, nvl(SAT,0) SAT, nvl(SUN,0) SUN,
nvl(MON,0) +  nvl(TUE,0) + nvl(WED,0) + nvl(THU,0) + nvl(FRI,0) +nvl(SAT,0) + nvl(SUN,0) TotalForWeek
from 
(
select   clientname,to_char(tradedate,'Dy') dw, sum(quantity) quantity from ClientTrade
group by clientname,  to_char(tradedate,'Dy')
)
pivot (sum(quantity) FOR dw in ('Mon' as MON,'Tue' as TUE,'Wed' AS WED,'Thu' AS THU,'Fri' AS FRI,'Sat' AS SAT,'Sun' AS SUN) )
于 2012-02-13T21:21:13.933 回答