Filtering and restricting in query - php

Question

I would like to seek some help in my query...i want to do is if specific atic and oaic is empty in the table...the interview_sum or other_sum to that specific atic oaic should be empty too....can anyone know how to do that?
picture of current output:
current query: my query still gives numbers to other_sum or interview_sum even its empty.
SELECT DISTINCT
IF(t.inttotal=NULL,0,(SELECT SUM(t2.inttotal)
FROM app_interview2 AS t2
WHERE t2.atic = t.atic AND t2.inttotal>0)/7)
AS interview_sum,
IF(o.ototal=NULL,0,(SELECT SUM(o2.ototal)
FROM other_app2 AS o2
WHERE o2.oaic = o.oaic AND o2.ototal>0)/7)
AS other_sum,
atid,
atic,
atname,
region,
town,
uniq_id,
position,
salary_grade,
salary
FROM app_interview2 AS t, other_app2 AS o
GROUP BY t.atname HAVING COUNT(DISTINCT t.atic)

Answer 1

I made a few assumptions:
You probably have a table that app_interview2.atic and other_app2.oaic are the foreign keys of, but since you did not share it, I derived a table in the FROM clause.
This assumes atname is always the same for atid.
You are also dividing by 7 - which I assume is to get the average, so I used the AVG function.
Solution---
SELECT t1.id AS atid
,interview.atname AS atname
,COALESCE(interview.interviewsum, 0) AS interviewsum
,COALESCE(interview.interviewavg,0) AS interviewavg
,COALESCE(other.othersum, 0) AS othersum
,COALESCE(other.otheravg) AS otheravg
FROM (SELECT DISTINCT atid AS id
FROM app_interview2
UNION
SELECT DISTINCT oaic
FROM other_app2) AS t1
LEFT JOIN (SELECT atid, atname, SUM(inttotal) AS interviewsum, AVG(inttotal) AS interviewavg
FROM app_interview2
GROUP BY atid, atname) as interview
ON interview.atid = t1.id
LEFT JOIN (SELECT oaic, SUM(ototal) AS othersum, AVG(ototal) AS otheravg
FROM other_app2
GROUP BY oaic) AS other
ON other.oaic = t1.id;
--
If this gives the results your were hoping for, I would replace the t1 derived table in the FROM clause with the table whose primary key I described above AND probably has those columns (e.g., region, town, etc) that I did not include