relationships table;
30-row-example
news_id, relation_id
1, 1;
2, 1;
3, 1;
...
29, 1;
30, 1;


3k example;
1, 2;
2, 2;
...
2998, 2;
2999, 2;
3000, 2;

I'm using "relation_id IN (1)" for 30 row test, using 2 for 3k test.