如何合并两个查询并将数据放入一行？

Question

I have a situation here to get data(ie fname and lname) from two different table comparing their jobid, deliverymanid, pickupmanid and employeeid from job and employee table and combine it in one row.

This is the job table

jobid  pickupmanid  deliverymanid
-----  -----------  -------------
  1         1            2
  2         2            2

This is the employee table

employeeid     fname         lname
----------  -----------  -------------
    1           ABC          XYZ
    2           LMN          OPR

Here pickupmanid and deliverymanid act as a foreign keys for job table referring to employeeid in employee table.

Answer 1

You could join the job table on the employee table twice - once for the picker-upper and once for the deliveryman:

SELECT j.jobid, 
       p.fname AS pickup_fname, p.lname AS pickup_lname,
       d.fname AS delivery_fname, d.lname AS delivry_lname
FROM   job j
JOIN   employee p ON p.employeeid = j.pickupmanid
JOIN   employee d ON d.employeeid = j.deliverymanid