3 mysql table join but not getting expected result that i want - mysql

Question

Here my table:
account
ac name
120 Tom
130 Jony
140 Jone
bread_sale
ac pcs amount date
120 12 60 2018-01-03
120 10 50 2018-01-04
140 8 40 2018-01-04
130 5 25 2018-01-05
water_sale
ac pcs amount date
130 2 30 2018-01-03
130 5 75 2018-01-04
140 3 45 2018-01-04
130 4 60 2018-01-05
120 5 75 2018-01-07
Here's the query that I have tried:
select account.ac,
account.name,
bread_sale.amount as BSAmount,
bread_sale.date as BSDate,
water_sale.amount as WSAmount,
water_sale.date as WSDate
from account left outer join bread_sale on account.ac = bread_sale.ac
left outer join water_sale on water_sale.ac = account.ac
order by account.ac
This is the result:
ac name BSAmount BSdate WSAmount WSdate
120 Tom 30 2018-01-03 75 2018-01-07
120 Tom 75 2018-01-04 75 2018-01-07
130 Jony 45 2018-01-05 30 2018-01-03
130 Jony 60 2018-01-05 75 2018-01-04
130 Jony 75 2018-01-05 60 2018-01-05
140 Jone 75 2018-01-04 45 2018-01-04
But I want to obtain something like this:
ac name BSAmount BSdate WSAmount WSdate
120 Tom 60 2018-01-03 75 2018-01-07
120 Tom 50 2018-01-04 0 2018-01-07
130 Jony 25 2018-01-05 30 2018-01-03
130 Jony 0 2018-01-05 75 2018-01-04
130 Jony 0 2018-01-05 60 2018-01-05
140 Jone 40 2018-01-04 45 2018-01-04
In 2018-01-07 Tom did not sale water but I get 75 amount.
Someone help me, please

Answer 1

It is achievable but messy and probably not very efficient. There is a relationship between the bread water and account on ac. It is possible to establish the maximum number of row numbers spanning bread and water and then rejoining on row number. Put another way bread and water are joined on a position basis (ie the order rows appear in the tables) The resulting query is horrible and parses the data more frequently than I would be comfortable with personally.
so
select * from
(
select c.ac cac,t.name tname,d.amount bsamount, d.dt ddt,
e.amount wsamount ,e.dt edt
,
case when d.dt is not null and d.dt < e.dt then d.dt
when d.dt is not null and e.dt is null then d.dt
else e.dt
end as sortorder
from
(
select *
from
(
select bs.ac,
if(bs.ac <> #p,#rn:=1,#rn:=#rn+1) rn,
#p:=bs.ac p
from bs
cross join (select #rn:=0,#p:=0) r
order by bs.ac,bs.dt
) a
union
(
select ac2,rn1,p1
from
(
select ws.ac ac2,
if(ws.ac <> #p1,#rn1:=1,#rn1:=#rn1+1) rn1,
#p1:=ws.ac p1
from ws
cross join (select #rn1:=0,#p1:=0) r
order by ws.ac,ws.dt
) b
)
) c
left join
(
select bs.ac,pcs,amount,dt,
if(bs.ac <> #p3,#rn3:=1,#rn3:=#rn3+1) rn3,
#p3:=bs.ac p
from bs
cross join (select #rn3:=0,#p3:=0) r
order by bs.ac,bs.dt
) d
on d.ac = c.ac and d.rn3 = c.rn
left join
(
select ws.ac,pcs,amount,dt,
if(ws.ac <> #p4,#rn4:=1,#rn4:=#rn4+1) rn4,
#p4:=ws.ac p
from ws
cross join (select #rn4:=0,#p4:=0) r
order by ws.ac,ws.dt
) e
on e.ac = c.ac and e.rn4 = c.rn
join t on t.ac = c.ac
) f
order by cac , sortorder;
+------+-------+----------+------------+----------+------------+------------+
| cac | tname | bsamount | ddt | wsamount | edt | sortorder |
+------+-------+----------+------------+----------+------------+------------+
| 120 | Tom | 60 | 2018-01-03 | 75 | 2018-01-07 | 2018-01-03 |
| 120 | Tom | 50 | 2018-01-04 | NULL | NULL | 2018-01-04 |
| 130 | Jony | 25 | 2018-01-05 | 30 | 2018-01-03 | 2018-01-03 |
| 130 | Jony | NULL | NULL | 75 | 2018-01-04 | 2018-01-04 |
| 130 | Jony | NULL | NULL | 60 | 2018-01-05 | 2018-01-05 |
| 140 | Jone | 40 | 2018-01-04 | 45 | 2018-01-04 | 2018-01-04 |
+------+-------+----------+------------+----------+------------+------------+
6 rows in set (0.00 sec)

Answer 2

select account.ac,
account.name,
bread_sale.amount as BSAmount,
bread_sale.date as BSDate,
water_sale.amount as WSAmount,
water_sale.date as WSDate
from account left outer join bread_sale on account.ac = bread_sale.ac
left outer join water_sale on water_sale.ac = bread_sale.ac
order by account.ac
This Query would produce this result. Your zeros will be replaced by correct value. I hope may be you would need this reuslt.
ac name BSAmount BSdate WSAmount WSdate
120 Tom 60 2018-01-03 75 2018-01-07
120 Tom 50 2018-01-04 75 2018-01-07
130 Jony 25 2018-01-05 30 2018-01-03
130 Jony 25 2018-01-05 75 2018-01-04
130 Jony 25 2018-01-05 60 2018-01-05
140 Jone 40 2018-01-04 45 2018-01-04