Subtract from purchase and sale s table for found balance - sql

Question

I have two tables: table one Purchase and another sales table, actually I need balance using subtract two table, subtract sales from table Purchase. My code is given below
create table purchase(
id number(10) primary key,
name varchar2(10),
p_qty number(10)
);
and insert data :
insert into purchase values(01,'productB',235);
insert into purchase values(04,'productC',394);
insert into purchase values(05,'productD',381);
insert into purchase values(08,'productE',357);
insert into purchase values(09,'productF',389);
insert into purchase values(10,'productQ',336);
another table: Sales
create table sales(
id number(10),
s_qty number(10),
constraint pid_pk foreign key (id)REFERENCES purchase(id)
);
insert data to salse table :
insert into sales values(01,34);
insert into sales values(04,54);
insert into sales values(05,44);
insert into sales values(09,50);
insert into sales values(01,3);
insert into sales values(04,4);
insert into sales values(05,5);
insert into sales values(09,53);
insert into sales values(01,2);
insert into sales values(04,2);
insert into sales values(05,2);
insert into sales values(09,2);
insert into sales values(01,4);
insert into sales values(04,9);
insert into sales values(05,11);
insert into sales values(09,7);
and I have using two query
Query 1:
select id,name,sum(p_qty) as p_total from purchase group by id,name;
ID NAME P_TOTAL
5 productD 381
10 productQ 336
4 productC 394
1 productB 235
8 productE 357
9 productF 389
QUERY2:
select id,sum(s_qty) as s_total from sales group by id;`
ID S_TOTAL
1 43
4 69
5 62
9 112
NOW I Want to below the table for balance each item
ID NAME P_TOTAL S_TOTAL BALANCE
5 productD 381 62 319
4 productC 394 69 325
1 productB 235 43 192
9 productF 389 112 277

Answer 1

Hope this helps.
SELECT p.id, p.name, p.p_total, s.s_total,
p.p_total - s.s_total AS balance
FROM (select id, name, sum(p_qty) as p_total FROM purchase
GROUP BY id, name) p
INNER JOIN (select id, sum(s_qty) as s_total FROM sales
GROUP BY id) s
ON s.ID = p.ID;

Answer 2

You're almost there. Take the two queries you already have and join them together:
SELECT p.ID,
p.NAME,
p.P_TOTAL,
s.S_TOTAL,
p.P_TOTAL - s.S_TOTAL AS BALANCE
FROM (select id, name, sum(p_qty) as p_total
from purchase
group by id, name) p
INNER JOIN (select id, sum(s_qty) as s_total
from sales
group by id) s
ON s.ID = p.ID
Best of luck.

Answer 3

I Want to below the table for balance each item
You way you want the balance for each item, but you only show the balance for the items with sales.
If you want each item that has been purchased, you can use left join with subqueries:
select p.id, p.name, p_total, coalesce(s_total, 0),
(p_total - coalesce(s_total, 0)) as balance
from (select id, name, sum(p_qty) as p_total
from purchase
group by id,name
) p left join
(select id, sum(s_qty) as s_total
from sales
group by id
) s
on p.id = s.id;
If you want each item that has sales, then just use inner join.