INSERT INTO based on a INNER JOIN'd SELECT column not returning SELECT value

Question

I'm attempting to do an INSERT into Accounts based upon a CustNo value, with the tables connected by AccountId . For some reason I cannot figure out, the SELECT cust.CustNo column, based on the Custs table columns of GivenName and Surname , is not grabbing anything despite working by the same WHERE clause when tested on it's own.

INSERT INTO Accounts (Type, Balance, CustNo)
    SELECT 
        'Chequing', 0, cust.CustNo
    FROM 
        Custs cust
    INNER JOIN 
        Accounts ON cust.CustNo = Accounts.CustNo
    WHERE 
        cust.GivenName = 'FirstName' AND cust.Surname = 'LastName';

I can't think of any reason why this is not returning any errors, yet also works and grabs the correct CustNo as a separate SELECT with this same WHERE . Am I missing an essential field somewhere to relate these two tables, or possibly incorrectly joining them?

Answer 1

While I did not quite end up answering my original question, I DID however find another way to accomplish what I was trying to do with a nested SELECT instead of an INNER JOIN .

For anyone else that comes by trying to INSERT data to one table based upon a field (My Name , Surname , and CustNo problem) that is in another related table, try something like this:

INSERT INTO Accounts (Type, Balance, CustNo)
SELECT 'Chequing', 0, (SELECT CustNo FROM Custs)//This is the solution, a nested Select
WHERE GivenName = 'FirtName' AND Surname = 'LastName');