showing counter in mysql query - mysql

Question

I have mysql query given below. I which counter has been used. if i enter category Id 1 for 3 times then counter is coming 3 which is correct but with this i want if i do not enter then different coloumn should come with NO.
output should be
KU Electrical
Yes 6 2
No 1 2
In this KU and Electrical are my sale channel name. Yes means counter of enteries of KU and No means which have not entered. Please help out in this. i am struggling
select
SalesChannel.name,
Transaction.category_id,
count(Transaction.category_id) as "count"
from outlets Outlet
inner join transactions Transaction on Outlet.id = Transaction.outlet_id
inner join sale_channels SalesChannel on SalesChannel.id = Outlet.sale_channel_id
group by Transaction.category_id;
below are three tables which I used
1) transactions
CREATE TABLE IF NOT EXISTS `transactions` (
`id` int(11) NOT NULL,
`zone_id` int(11) NOT NULL,
`state_id` int(11) NOT NULL,
`city_id` int(11) NOT NULL,
`category_id` int(11) NOT NULL,
`sub_category_id` int(11) NOT NULL,
`brand_id` int(11) NOT NULL,
`model_id` int(11) NOT NULL,
`outlet_id` int(11) NOT NULL,
`no_of_units` int(11) NOT NULL,
`mop` decimal(10,2) NOT NULL
) ENGINE=InnoDB AUTO_INCREMENT=5 DEFAULT CHARSET=latin1;
--
-- Dumping data for table `transactions`
--
INSERT INTO `transactions` (`id`, `zone_id`, `state_id`, `city_id`, `category_id`, `sub_category_id`, `brand_id`, `model_id`, `outlet_id`, `no_of_units`, `mop`) VALUES
(1, 2, 2, 2, 2, 1, 1, 1, 1, 3, '6.00'),
(2, 2, 2, 2, 2, 1, 1, 1, 1, 3, '6.00'),
(3, 1, 1, 1, 1, 1, 1, 1, 1, 4, '2.00'),
(4, 2, 2, 2, 1, 1, 1, 1, 2, 4, '2.00');
2) outlets
CREATE TABLE IF NOT EXISTS `outlets` (
`id` int(11) NOT NULL,
`outlet_code` varchar(255) NOT NULL,
`name` varchar(255) NOT NULL,
`zone_id` int(11) NOT NULL,
`state_id` int(11) NOT NULL,
`city_id` int(11) NOT NULL,
`sale_channel_id` int(11) NOT NULL,
`is_active` tinyint(1) NOT NULL,
`created` datetime NOT NULL,
`modified` datetime NOT NULL
) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=latin1;
--
-- Dumping data for table `outlets`
--
INSERT INTO `outlets` (`id`, `outlet_code`, `name`, `zone_id`, `state_id`, `city_id`, `sale_channel_id`, `is_active`, `created`, `modified`) VALUES
(1, '1508', 'Ashok electricals', 2, 2, 2, 1, 1, '2016-10-03 00:00:00', '2016-10-03 00:00:00'),
(2, '1233', 'vinayak electricals', 1, 1, 1, 2, 1, '2016-10-04 00:00:00', '2016-10-04 00:00:00');
3) sale_chennals
CREATE TABLE IF NOT EXISTS `sale_channels` (
`id` int(11) NOT NULL,
`name` varchar(255) NOT NULL,
`is_active` tinyint(1) NOT NULL,
`created` datetime NOT NULL,
`modified` datetime NOT NULL
) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=latin1;
--
-- Dumping data for table `sale_channels`
--
INSERT INTO `sale_channels` (`id`, `name`, `is_active`, `created`, `modified`) VALUES
(1, 'KU', 1, '2016-10-03 00:00:00', '2016-10-03 00:00:00'),
(2, 'Electricals', 1, '2016-10-04 00:00:00', '2016-10-04 00:00:00');
SQL fiddle: http://sqlfiddle.com/#!9/3f497/1

Answer 1

You are grouping by category. That means you get one result row per category. In each of these rows you show the count and a sale channel name. This sale channel name is just one of the names found in the records for the category arbitrarily chosen.
I suppose you want to count per category and sale channel. Hence your group by clause should be group by SalesChannel.name, Transaction.category_id:
select
SalesChannel.name,
Transaction.category_id,
count(Transaction.category_id) as "count"
from outlets Outlet
inner join transactions Transaction on Outlet.id = Transaction.outlet_id
inner join sale_channels SalesChannel on SalesChannel.id = Outlet.sale_channel_id
group by SalesChannel.name, Transaction.category_id;
SQL fiddle: http://sqlfiddle.com/#!9/3f497/2
This result, however, doesn't show an entry for Electricals / category 2, because there is no transaction for this combination in the table. If you want to show a zero count for this, you'd have to create the complete result set (i.e. all combinations of channel and category, whether they have a transaction or not) first. Then you'd outer join the transactions:
select
sc.name,
c.id as category_id,
count(t.id) as "count"
from sale_channels sc
cross join categories c
left join outlets o on o.sale_channel_id = sc.id
left join transactions t on t.outlet_id = o.id and t.category_id = c.id
group by sc.name, c.id;
SQL fiddle: http://sqlfiddle.com/#!9/60e998/5