クエリの何が問題になっていますか?
SELECT ...
MATCH(results.keywords) AGAINST('".DB::e($_POST['s'])."' IN BOOLEAN MODE) AS aaa,
SUM( MATCH(tags.keywords) AGAINST('".DB::e($_POST['s'])."' IN BOOLEAN MODE) ) AS bbb
FROM table1
JOIN table2 ... JOIN table3 ...
WHERE (aaa > 0 here the alias doesn't work!
OR bbb > 0 here the alias doesn't work! )
GROUP BY table1.id
ORDER BY aaa DESC, but here the alias works!
bbb DESC but here the alias works!
WHERE句を削除すると完全に機能します...では、エイリアスの何が問題なのですか?