mysql - 使用连接、分组和全文的 where 子句中的未知列 xxx

Question

我的查询有什么问题？

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!

如果我删除 WHERE 子句效果很好......那么我的别名有什么问题？

Answer 1

您需要使用HAVING（此处和此处，帮助较少：此处）；该WHERE子句在别名甚至存在之前就被评估；）