我尝试制作一个简单的触发器，在付款时更新客户余额。在begin语句后面显示错误。我尝试在where语句中使用新插入的customerID，再次尝试使用几行来计算新的余额。有人可以用正确的语法帮助我吗？表位于底部。
--Whenever a payment is made, customer amount owed is adjusted
create or replace trigger paymentUpdate
after insert on payment
for each row
when (new.transactionID > 0)
declare
newAmount decimal(7,2);
currentBalance decimal(7,2);
begin
--Get the outstanding customer balance
select amountOwed into currentBalance
from customer
where customer.customerID=:new.customerID; --Does this do what I think it does?
-- ^^is any of this needed?
--Subtracts the recently made payment from the customer balance
newAmount := currentBalance - :new.amount;
--Update customer amount owed
update customer.amountOwed
set amountOwed = newAmount
where customer.customerID=:new.customerID;
dbms_output.put_line('Original account balance was: '||currentBalance);
dbms_output.put_line('Payment made was: $'||:new.amount); --Check this
dbms_output.put_line('Customer account balance is now: '||newAmount);
end paymentUpdate;
/
--commit needed?
TABLES：
INSERT INTO customer (customerID, name, address, insurance, contactInfo, customerType, licenseNumber, amountOwed)
VALUES (45124512, 'Bob Jones', '232 Sycamore Ln.', 'Pekin', 3095555145, 'New', 'SSSSFFFYYDDD', 220.00);
INSERT INTO customer (customerID, name, address, insurance, contactinfo, customertype, licensenumber, amountOwed)
VALUES (12892222, 'Mike Tyson','100 Haters Rd.', 'Progressive', 2175555555, 'Regular', 'FGHJHHHHTYYY', 42.00);
INSERT INTO payment (customerID, transactionID, amount, method, payDate)
VALUES (45124512, 56785678, 220.00, 'Credit Card', '25-JUN-15');
INSERT INTO payment (customerID, transactionID, amount, method, payDate)
VALUES (12892222, 68689000, 42.00, 'Cash', '25-JUN-15');
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