Question

I have two tables:

EMP

emp_id | Name | Surname | 
1      | Bob | Park    | 
2      | Annie| South   |  
3      | Eric | P.      |

PROJECT

proj_id | Tester_1 | Tester_2 | Tester_3 |
1       |     2    |    3     |    1     |

Now I am trying to make a view, so that I have the following

proj_id | Tester_1_Name   | Tester_2_Name   |     Tester_3_Name
1       |      Annie      |     Eric        |          Bob

Answer 1

You just have to Join

   Select proj_id, 
      t1.name + ' ' + t1.surname tester1,
      t2.name + ' ' + t2.surname tester2,
      t3.name + ' ' + t3.surname tester3
   From Project p 
     Left Join Emp t1 On t1.emp_id = p.Tester_1
     Left Join Emp t2 On t2.emp_id = p.Tester_2
     Left Join Emp t2 On t3.emp_id = p.Tester_3

As a View…

  Create View ProjectWithTesters
  As 
       Select proj_id, 
          t1.name + ' ' + t1.surname tester1,
          t2.name + ' ' + t2.surname tester2,
          t3.name + ' ' + t3.surname tester3
       From Project p 
         Left Join Emp t1 On t1.emp_id = p.Tester_1
         Left Join Emp t2 On t2.emp_id = p.Tester_2
         Left Join Emp t2 On t3.emp_id = p.Tester_3

NOTE: As others mentioned, your database design violates First Normal Form “There should be no repeating groups”, which means that a table should not contain multiple columns which represent multiple instances of some attribute (like your tester_1, tester_2, tester_3). Check out this link: database normalization for more info.