<分区>
所以我想创建触发器:
CREATE TRIGGER add_primary_key
AFTER INSERT ON CAJ
FOR EACH ROW
WHEN (ID_CAJ IS NULL)
DECLARE
maximum NUMBER;
BEGIN
maximum := SELECT MAX(ID_CAJ) FROM caj;
if (maximum <> 0)
UPDATE caj
SET ID_CAJ = maximum + 1;
WHERE CAJ_ID = NULL
maximum = maximum +1;
END;
出现此错误:
"invalid NEW or OLD specification"
*Cause: An invalid NEW or OLD specification was given for a column.
*Action: Re-specify the column using the correct NEW or OLD specification.
你们有什么想法吗？