How to make conditional aggregation using gorm? - database

Question

I want to do a conditional aggregation in order to sum some values of a column into different columns. The data is this:
id
amount
status
1
100
confirmed
1
50
confirmed
1
50
unconfirmed
1
10
unconfirmed
I want to make it like this:
confirmed
unconfirmed
total
150
60
210
Currently, I'm able to do this by using raw SQL
SELECT
sum(amount) FILTER (WHERE status = 'confirmed') AS confirmed,
sum(amount) FILTER (WHERE status = 'unconfirmed') AS unconfirmed,
sum(amount) AS total
FROM table_name
WHERE id = 1
How can I make this query using gorm?

Answer 1

Is this you expect?
import (
"fmt"
"gorm.io/driver/mysql"
"gorm.io/gorm"
)
type Res struct {
Confirmed int
Unconfirmed int
Total int
}
func main() {
sql := "select sum(if (status = 'confirmed', amount, 0)) as confirmed ,sum(if (status = 'unconfirmed', amount, 0)) as unconfirmed, sum(amount) as total from m_73627615 where id = 1"
dsn := fmt.Sprintf("%s:%s#(%s:3306)/%s?charset=utf8&parseTime=True", "", "", "", "")
db, err := gorm.Open(mysql.Open(dsn), &gorm.Config{})
if err != nil {
panic(err)
}
var r Res
_ = db.Raw(sql).Scan(&r).Error
fmt.Println(r)
// {150 60 210}
}