MySQL - calculate row total using a temporary column when select - mysql

Question

I have a table (4 columns) like
CREATE TABLE IF NOT EXISTS `myTable` (
`id` int(12) NOT NULL AUTO_INCREMENT,
`refer_id` int(12) NOT NULL,
`name` varchar(255) COLLATE utf8_unicode_ci NOT NULL,
`groupType` int(12) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci AUTO_INCREMENT=1 ;
I create a simple data
INSERT INTO `myTable` (`name`, `refer_id`, `groupType`) VALUES
('a', 1, 1),
('b', 2, 1),
('c', 3, 1),
('d', 4, 2),
('e', 4, 2),
('f', 4, 2),
('g', 7, 2),
('h', 7, 2),
('i', 5, 3),
('k', 5, 3),
('l', 6, 3);
I have 3 groupType. while groupType 1 and 3 is the same (can not group)
and groupType 2 (is group with same refer_id).
It looks like
id groupType group_field total
1 1 1 1
2 1 2 1
3 1 3 1
4 2 group_4 3
7 2 group_7 2
9 3 9 1
10 3 10 1
11 3 11 1
I'm using below query to do that (i think it looks good)
select id,
groupType,
IF(groupType != 2, #gf:=id, #gf:=CONCAT('group_',refer_id)) as group_field,
count(*) as total
from myTable
group by group_field
order by id asc
And I want to get total rows of above query(8 rows) by following, but it is not correct. How to do that? Thanks (I don't want union all)
select id,
groupType,
IF(groupType != 2, #gf:=id, #gf:=CONCAT('group_',refer_id)) as group_field,
count(*) as total,
CONCAT_WS('', 1) AS defaultValue,
SUM(defaultValue) as totalCount
from myTable
group by group_field
order by id asc
maybe something like ?
id groupType group_field total defaultValue totalCount
1 1 1 1 1 8
2 1 2 1 1 8
3 1 3 1 1 8
4 2 group_4 3 1 8
7 2 group_7 2 1 8
9 3 9 1 1 8
10 3 10 1 1 8
11 3 11 1 1 8

Answer 1

Try This
CREATE TABLE IF NOT EXISTS `myTable` (
`id` int(12) NOT NULL AUTO_INCREMENT,
`refer_id` int(12) NOT NULL,
`name` varchar(255) COLLATE utf8_unicode_ci NOT NULL,
`groupType` int(12) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci AUTO_INCREMENT=1 ;
✓
INSERT INTO `myTable` (`name`, `refer_id`, `groupType`) VALUES
('a', 1, 1),
('b', 2, 1),
('c', 3, 1),
('d', 4, 2),
('e', 4, 2),
('f', 4, 2),
('g', 7, 2),
('h', 7, 2),
('i', 5, 3),
('k', 5, 3),
('l', 6, 3);
✓
select min(id) id,
groupType,
IF(groupType != 2, #gf:=id, #gf:=CONCAT('group_',refer_id)) as group_field,
count(*) as total,
count(*) over () as cnt
from myTable
group by groupType, group_field
order by id asc
id | groupType | group_field | total | cnt
-: | --------: | :---------- | ----: | --:
1 | 1 | 1 | 1 | 8
2 | 1 | 2 | 1 | 8
3 | 1 | 3 | 1 | 8
4 | 2 | group_4 | 3 | 8
7 | 2 | group_7 | 2 | 8
9 | 3 | 9 | 1 | 8
10 | 3 | 10 | 1 | 8
11 | 3 | 11 | 1 | 8
db<>fiddle here
For MySQl 5.5+
select min(id) id,
groupType,
IF(groupType != 2, #gf:=id, #gf:=CONCAT('group_',refer_id)) as group_field,
count(*) as total,
(select count(distinct IF(groupType != 2, #gf:=id, #gf:=CONCAT('group_',refer_id))) from myTable) cnt
from myTable
group by groupType, group_field
order by id asc
id | groupType | group_field | total | cnt
-: | --------: | :---------- | ----: | --:
1 | 1 | 1 | 1 | 8
2 | 1 | 2 | 1 | 8
3 | 1 | 3 | 1 | 8
4 | 2 | group_4 | 3 | 8
7 | 2 | group_7 | 2 | 8
9 | 3 | 9 | 1 | 8
10 | 3 | 10 | 1 | 8
11 | 3 | 11 | 1 | 8
db<>fiddle here