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

i do inserts into a table if the record doesn't exist this way. may not be entirely what is after but it may be helpful

insert into x (a,b)
select 1,2
where 0=(select count(*) from x where a = 1 and b = 2)