Deduct result of one query from another SQL
Question
I have result of an SQL query as following:
Date | Pt_Cnt | Wardname | Division
12/11| 23 | wd01 | Med
12/11| 30 | wd02 | Surg
12/11| 35 | wd08 | Surg
and I have a result from another SQL query for patients on leave as:
Date | Pt_Cnt | Wardname | Division
12/11| 2 | wd01 | Med
12/11| 1 | wd02 | Surg
I want the number of pt_cnt from the second query deducted from pt_cnt of 1st query. How can this be done in SQL?
1 answers
solution1
0 2021-12-14 04:45:54
select a.date, a.pt_cnt-ifnull(b.pt_cnt,0), a.ward, a.division
from (first query) as a
left join (second query) as b on a.date = b.date and a.ward = b.ward and a.division = b.divisionn
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