now there is an array. You need to find out the sum of the fields number when the field card_id equals each value of the array
. Finally, you want the result to look something like this:
card_id sum
1 10
2 20
currently, you can only traverse queries one by one, and you need to query the database many times: $this- > model- > where ("card_id", $id)-> sum (" number");
I don"t know if there is any way to query all at once
select card_id,sum (number) from tablename where card_id in array_cardid group by card_id;
where id in (1 Magazine 2) get to know
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