SQL如果"某事"选择计数

Question

来自我的自定义视图的输出如下......

Col1    Col2    Col3   Col4

xxxx    Cake    1      1*
Cake    xxxx    2*     1
xxxx    Cake    2      0*
xxxx    Cake    0      0*
Cake    xxxx    2*     0
Cake    xxxx    2*     0

我想要总结的是......

For every row, 
if the word Cake is found in Col1, then add the value of Col3 to Sum
else add the value of Col4 to sum

从上面的视图得到的SUM应该是1 + 2 + 0 + 0 + 2 + 2 = 7

提前致谢!

ps添加星号只是为了显示,应将哪些数字添加到总和.

Answer 1

有点像

select
   SUM( 
     Case 
         when Col1 = 'Cake' then Col3 
         when Col2 = 'Cake' then Col4 
         else 0 END 
   ) as MySum
from TheView