How to merge two queries into a subqueries - mysql

Question

I have database like this http://sqlfiddle.com/#!9/e52c43
First query is :
SELECT m.tanggal, sum(mi.qty) as totalMuatan, mi.idPlastik
FROM tblMuatan m
LEFT JOIN tblMuatanIsi mi ON m.idMuatan = mi.idMuatan
WHERE m.tanggal='2020-03-15'
GROUP BY mi.idPlastik
The result is:
tanggal totalMuatan idPlastik
2020-03-15 85 1
2020-03-15 10 2
And second query is :
SELECT s.tanggal, sum(si.qty) as totalStok, si.idPlastik
FROM tblStok s
LEFT JOIN tblStokIsi si ON s.idStok = si.idStok
WHERE s.tanggal = '2020-03-15'
GROUP BY si.idPlastik
The result is :
tanggal totalStok idPlastik
2020-03-15 100 1
2020-03-15 200 2
I want to merge that 2 queries into single query with subquery
tanggal totalStok totalMuatan netTotal idPlastik
2020-03-15 100 85 15 1
2020-03-15 200 10 190 2
How to do the subquery in example above? Thank you for the support

Answer 1

Better to use COALESCE since you're using LEFT JOIN for the tables you are calculating SUM from to avoid no result for the records that have NULL values.
select m.tanggal, t.totalStok, sum(mi.qty) as totalMuatan, coalesce(t.totalStok,0)-coalesce(sum(mi.qty),0) as netTotal, mi.idPlastik
from tblMuatan m
LEFT JOIN tblMuatanIsi mi ON m.idMuatan = mi.idMuatan
JOIN (SELECT s.tanggal, sum(si.qty) as totalStok, si.idPlastik
FROM tblStok s
LEFT JOIN tblStokIsi si ON s.idStok = si.idStok
WHERE s.tanggal='2020-03-15'
GROUP BY s.tanggal,si.idPlastik) t on m.tanggal=t.tanggal and mi.idPlastik = t.idPlastik
group by m.tanggal, t.totalStok,mi.idPlastik

Answer 2

Please try..
SELECT T1.tanggal, T2.totalStok, T1.totalMuatan, (T2.totalStok - T1.totalMuatan), T1.idPlastik
FROM
(SELECT m.tanggal, sum(mi.qty) as totalMuatan, mi.idPlastik
FROM tblMuatan m
LEFT JOIN tblMuatanIsi mi ON m.idMuatan = mi.idMuatan
WHERE m.tanggal='2020-03-15'
GROUP BY mi.idPlastik)
as T1,
(SELECT s.tanggal, sum(si.qty) as totalStok, si.idPlastik
FROM tblStok s
LEFT JOIN tblStokIsi si ON s.idStok = si.idStok
WHERE s.tanggal = '2020-03-15'
GROUP BY si.idPlastik)
as T2
WHERE
T1.tanggal = T2.tanggal;

Answer 3

SELECT a.tanggal,
b.totalstok,
a.totalmuatan,
( totalstok - totalmuatan ) netTotal,
a.idplastik
FROM (SELECT convert(varchar, m.tanggal, 23) tanggal,
Sum(mi.qty) AS totalMuatan,
mi.idplastik
FROM #tblmuatan m
LEFT JOIN #tblmuatanisi mi
ON m.idmuatan = mi.idmuatan
WHERE m.tanggal = 1
GROUP BY mi.idplastik,
convert(varchar, m.tanggal, 23)) a
JOIN (SELECT convert(varchar, s.tanggal, 23) tanggal,
Sum(si.qty) AS totalStok,
si.idplastik
FROM #tblstok s
LEFT JOIN #tblstokisi si
ON s.idstok = si.idstok
WHERE s.tanggal = 1
GROUP BY si.idplastik,
convert(varchar, s.tanggal, 23)) b
ON a.idplastik = b.idplastik