Table control: Computing values(columns) from different Database

Hi masters so i want to get different columns from different database and compute them but in my Module Data_Retrieve i don't know how to exactly get the respective columns they all have common pk:id for their values but once i call them i can't seem to get the values of the columns of the different tables

ex

table 1-Name | table1-quarter1 | table 2 - quarter2 | table 3 -quarter3 | table 4 - quarter4| Total |

      Josh       |          55          |             2           |             7          |        3              |    67  |