title: I would like to sum all of the data in a specific table column, if the appropriate ID of that table exists in another one
body: <p>I would like to SUM a value called amount from table 1, the considered, to be summed, values should only be the ones presenting in table 2. Meaning that, for the amount of row 1 in table 1 to be considered in the sum. the ID of that row 1 should be present in table 2.</p>
  <p>Thanks,</p>