Else is not running in mysql Query - mysql

Question

I have below query. In this I have yes and no case.
yes is accessing but else part is not working . Please have a look on this.
SELECT SalesChannel.name , count(Transaction.category_id) as count, (case when (Transaction.no_of_units > 0 and Transaction.mop > 0) THEN 'yes' ELSE 'No' END) AS Is_Present 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
the output should be as below
KU Electrical
Yes 6 2
No 1 2
6 is counter of KU and Yes refers the presence,similarly No is non presence of KU
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
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');

Answer 1

There is no data in tables that match for the else condition. Your condition is that "Transaction.no_of_units >0 AND Transaction.mop >0" that is not match in table value of both fields are greater than 0.
Otherwise, else condition works fine.

Answer 2

You are aggregating your data so as to get one row per SalesChannel.name. There may be some transaction records that result in 'Yes' and others in 'No' for a SalesChannel.name, so what then is Is_Present supposed to be?
Another issue with your query is that the sale channels are in a table. There are currently two of them, but there could be three or four or thousands sometime. A SQL query doesn't produce a result with a variable number of columns. The columns must be known beforehand. So a possible result could look like this:
Name Yes No
KU 6 1
Electrical 2 2
because you know you want it to be Yes or No only, no matter how many channels.
The query:
select
sc.name,
count(case when t.no_of_units > 0 and t.mop > 0 then 1 end) as yes,
count(case when t.no_of_units <= 0 or t.mop <= 0 then 1 end) as no
from sale_channels sc
join outlet o on o.sale_channel_id = sc.id
join transactions t on t.outlet_id = o.id;