Question

I’ve got two tables

The first has user transactions:

Date    Transaction    P1    P2    P3    P4    P5

(P1-P5 are three digit user ID’s)
Each transaction has 1, 2, 3, 4, and sometimes 5 users associated with it.

The second table has the user info:

ID    NAME    ACTIVE

I’m used to using a JOIN to display the user’s NAMES as opposed to their ID, but with FIVE users, I have no idea how do display their names in my PHP/HTML table.

Would anyone be able to shed some light on this?

Answer 1

You can join the same table for every user. If you do so you have to alias the multiple joined table differently.

select t1.Date, t1.Transaction, t1.P1, t1.P2, t1.P3, t1.P4, t1.P5
       u1.name, u2.name, u3.name, u4.name, u5.name
from table1 t1
left outer join table2 u1 on t1.p1 = u1.id
left outer join table2 u2 on t1.p2 = u2.id
left outer join table2 u3 on t1.p3 = u3.id
left outer join table2 u4 on t1.p4 = u4.id
left outer join table2 u5 on t1.p5 = u5.id