Sum of All Related Rows with Matching ID MySQL

Question

I have the following table schema:

    tbl_portfolio
    ----------
    id (auto number)
    name

-

    tbl_registration
    --         


        

Answer 1

Have you tried using SUM()?

SELECT port.*, SUM(trans.shares * trans.price) AS transaction_totals
  FROM tbl_portfolio port
  INNER JOIN tbl_registration reg ON reg.portfolio_id = port.id
  LEFT JOIN tbl_fund fund on fund.registration_id = reg.id
  LEFT JOIN tbl_transaction trans ON trans.fund_id = fund.id
  GROUP BY port.id