SQL Server INSERT INTO with WHERE clause

Question

I\'m trying to insert some mock payment info into a dev database with this query:

INSERT
    INTO
        Payments(Amount)
    VALUES(12.33)
WHERE
    Paymen         


        

Answer 1

If you want to insert new rows with the given CustomerID

INSERT
    INTO
        Payments(Amount,CustomerID )
VALUES(12.33,'145300');

else if you already have payment for the customer you can do:

UPDATE
        Payments
SET Amount = 12.33
WHERE
    CustomerID = '145300';