8 lines
163 B
MySQL
8 lines
163 B
MySQL
|
CREATE TRIGGER enforceZeroSpentAtStart
|
||
|
|
BEFORE INSERT ON Credit
|
||
|
|
BEGIN
|
||
|
|
SELECT RAISE(FAIL, "credit must be initially unused")
|
||
|
|
WHERE NEW.spent != 0;
|
||
|
|
END;
|
||
|
|
|