sql - PLSQL : Get sum for each day of week and total sum for week in a single query

Question

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，它应该返回这样的结果:
(这些天数来自 TradeDate 列，Mon = sum(Quantity) for Mon ，Tue = sum(Quantity) for Tue ...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此报告？

Answer 1

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