Mysql join two tables sum, where and group by - mysql

Question

I have two tables in the following structure:
sales
|date |time | name | total |
|2017-04-01 |10:23:59 | aaa | 100 |
|2017-04-01 |10:23:59 | aaa | 150 |
|2017-04-01 |11:33:30 | bbb | 200 |
|2017-04-01 |11:33:30 | bbb | 120 |
|2017-04-02 |10:50:59 | aaa | 70 |
|2017-04-02 |10:30:59 | bbb | 35 |
payment
|date |time | name | amount |
|2017-04-01 |10:23:59 | aaa | 300 |
|2017-04-01 |11:33:30 | bbb | 400 |
|2017-04-02 |10:50:59 | aaa | 425 |
|2017-04-02 |10:30:59 | bbb | 600 |
Terms
sales.time = payment.time
where date = 2017-04-01
sum(sales.total) and sum(payment.amount)
group by time
i want this result
|date |time | name | sum(total) | sum(amount)|
|2017-04-01 |13:23:59 | aaa | 250 | 300 |
|2017-04-01 |12:33:30 | bbb | 320 | 400 |
Table structure
CREATE TABLE `payment` (`id` int(5) NOT NULL,`date` date NOT NULL,`time` time NOT NULL,`name` varchar(10) NOT NULL,`amount` varchar(10) NOT NULL) ENGINE=InnoDB DEFAULT CHARSET=latin1 ROW_FORMAT=COMPACT;
INSERT INTO `payment` (`id`, `date`, `time`, `name`, `amount`) VALUES(3, '2017-04-01', '10:23:59', 'aaa', '300'),(4, '2017-04-01', '11:33:30', 'bbb', '400'),(5, '2017-04-02', '10:50:59', 'aaa', '425'),(6, '2017-04-02', '10:30:59', 'bbb', '600');
CREATE TABLE `sales` ( `id` int(5) NOT NULL,`date` date NOT NULL,`time` time NOT NULL,`name` varchar(10) NOT NULL,`total` int(10) NOT NULL) ENGINE=InnoDB DEFAULT CHARSET=latin1;
INSERT INTO `sales` (`id`, `date`, `time`, `name`, `total`) VALUES(1, '2017-04-01', '10:23:59', 'aaa', 100),(2, '2017-04-01', '10:23:59', 'aaa', 150),(3, '2017-04-01', '11:33:30', 'bbb', 200),(4, '2017-04-01', '11:33:30', 'bbb', 120),(5, '2017-04-02', '10:50:59', 'aaa', 70),(6, '2017-04-02', '10:50:59', 'bbb', 35);
ALTER TABLE `payment` ADD PRIMARY KEY (`id`);
ALTER TABLE `sales` ADD PRIMARY KEY (`id`);
ALTER TABLE `payment` MODIFY `id` int(5) NOT NULL AUTO_INCREMENT, AUTO_INCREMENT=7;
ALTER TABLE `sales` MODIFY `id` int(5) NOT NULL AUTO_INCREMENT, AUTO_INCREMENT=7;
Query
SELECT sales.time,sales.name,
SUM(sales.total),SUM(payment.amount)
FROM sales,payment
WHERE sales.time=payment.time
and sales.date like '2017-04-01%'
GROUP BY sales.time
ORDER BY sales.time;
Result is
10:23:59 aaa 250 600
11:33:30 bbb 320 800

Answer 1

You are multiplying the payments amount with the number of sales records, because you are joining all payments records with all sales records before summing up the amounts.
Aggregate first, and only join then.
In case there can always only be one payments record per date, time and name:
select p.name, p.time, p.name, s.sales_total, p.amount
from payments p
join
(
select date, time, name, sum(total) as total
from sales
group by date, time, name
) s
on s.date = p.date and s.time = p.time and s.name = p.name
where p.date = date '2017-04-01';
Otherwise:
select p.name, p.time, p.name, s.total, p.amount
(
select date, time, name, sum(amount) as amount
from payments
group by date, time, name
) p
join
(
select date, time, name, sum(total) as total
from sales
group by date, time, name
) s
on s.date = p.date and s.time = p.time and s.name = p.name
where p.date = date '2017-04-01';