sql joins with multiple conditions - mysql

Question

i have two tables, (say bill and soldproduct)
select * from bill;
+------+------------+------------+
| id | solddate | customerId |
+------+------------+------------+
| 11 | 2018-07-23 | 1 |
| 12 | 2018-07-21 | 1 |
| 13 | 2018-08-02 | 2 |
| 14 | 2018-08-08 | 2 |
| 15 | 2018-08-08 | 1 |
| 16 | 2018-08-08 | 1 |
+------+------------+------------+
select * from soldproduct;
+--------+-------------+----------+-------+------------+
| billid | productname | quantity | price | totalprice |
+--------+-------------+----------+-------+------------+
| 11 | book | 2 | 100 | 200 |
| 11 | pen | 10 | 10 | 100 |
| 11 | pencil | 5 | 2 | 10 |
| 12 | pencil | 5 | 2 | 10 |
| 13 | pen | 10 | 10 | 100 |
| 13 | book | 2 | 100 | 200 |
| 14 | pen | 1 | 10 | 10 |
| 14 | bottle | 1 | 75 | 75 |
| 15 | phone | 1 | 5000 | 5000 |
| 16 | lock | 15 | 50 | 750 |
+--------+-------------+----------+-------+------------+
I need to find the highest bill id using totalprice.
I tried using
select billid,sum(totalprice)
from soldproduct
where billid in (select id from bill where solddate >= date_sub(curdate(),interval 1 month))
group by billid
order by totalprice desc;
and my output is
+--------+-----------------+
| billid | sum(totalprice) |
+--------+-----------------+
| 15 | 5000 |
| 16 | 750 |
| 11 | 310 |
| 13 | 300 |
| 12 | 10 |
| 14 | 85 |
+--------+-----------------+
How do i get the same output with a single query using joins (without using subquery)?

Answer 1

try the following join
select billid,sum(totalprice)
from soldproduct
join bill on soldproduct.billid = bill.id and solddate >= date_sub(curdate(),interval 1
month)
group by billid
order by totalprice desc;

Answer 2

Can you try the below query:(I do not tested it out)
SELECT billid, SUM(totalprice)
FROM soldproduct SP
JOIN bill B ON (B.id = SP.billid)
WHERE B.solddate BETWEEN (CURRENT_DATE() - INTERVAL 1 MONTH) AND CURRENT_DATE()
GROUP BY SP.billid
ORDER BY SP.totalprice DESC;