MySQL 按条件分组

Question

I have a problem of MySQL group by. I have a field called 'type'. I would like to make a group by of this field. Here is the examples.

Amount	type
30	disable
50	V123
40	AGA
100	V2594
30	disable
40	school

I would like to have the following group by

type	Amount
disable	60
VIP	150
AGA	40
school	40

which mean I would like to check if the type is 'V' for prefix. If it is 'V' prefix and the records will group together with new name 'VIP'. Otherwise just keep the same name.

Thanks you a lot.

Answer 1

We can use conditional aggregation here:

SELECT
    CASE WHEN type LIKE 'V%' THEN 'VIP' ELSE type END AS type,
    SUM(Amount) AS amount
FROM yourTable
GROUP BY 1;