PLSQL UPDATE OF with Join - oracle

Question

I'm trying to create a PLSQL statement that updates the money in the inventory of the characters with the money from all the creatures they've fought
The following is the code I've been trying:
DECLARE
inv_money character.money%TYPE;
CURSOR updmoney IS
SELECT *
FROM character
WHERE id IN (SELECT character_id FROM inst_creature)
FOR UPDATE OF money;
BEGIN
FOR v_character IN updmoney LOOP
SELECT inst_creature.money
INTO inv_money
FROM inst_creature,character
WHERE inst_creature.character_id = character.ID;
UPDATE character
SET money = money+inv_money
WHERE CURRENT OF updmoney;
END LOOP;
COMMIT;
END;
There is a character_id in the inst_creature table which is used to define the character that fought that creature.
I'm getting the error
ORA-01422: exact fetch returns more than requested number of rows.
I've been trying to fix it by using Google to get a solution but nothing has been working so far. Any thoughts?

Answer 1

What happens when a character has killed more than one monster? ORA-01422, that's what. The SELECT ... INTO syntax populates a scalar value, that is one row. When the query returns more than one row PL/SQL hurls ORA-01422.
" Is there any solution to this for it to work?"
The easiest way is to fix the query so it returns one row. As you're just adding money to the character's trove, you can use an aggregate:
SELECT sum(inst_creature.money)
INTO inv_money
FROM inst_creature,character
WHERE inst_creature.character_id = character.ID;
So you get one row per character, and one update per character.