Question

I have a query

SELECT sum(cash)  from bought_cash WHERE uid=1 AND source NOT IN ('a', 'b')  

gives the result as 140

and

 SELECT sum(cash)  from bought_cash WHERE uid=1 AND source  IN ('a', 'b')  

gives NULL

and

SELECT sum(cash)  from bought_cash WHERE uid=1 

gives result as 240

and

SELECT sum(cash)  from bought_cash WHERE uid=1 and source is null  

gives result as 100

How do I write a query so that the first query gives result as 240 by including the null values.

Answer 1

You can try also next:

select sum(cash) 
from bought_cash
where uid = 1 and (source is null or source not in ('a', 'b'))