In the following query, my eventual goal is to get output that looks something like this:

0 | 13744878, 8523154, 8600448, 2721809
1 | 34682, 63211, 6083615


mysql> SELECT pl_from, page_id FROM pagelinks INNER JOIN page ON pagelinks.pl_title = page.page_title;
+---------+----------+
| pl_from | page_id  |
+---------+----------+
|       0 | 13744878 | 
|       0 |  8523154 | 
|       0 |  8600448 | 
|       0 |  2721809 | 
|       1 |    34682 | 
|       1 |    63211 | 
|       1 |  6083615 | 
+---------+----------+