我的查询与数据库中的cat, os, device, country匹配。
我希望获得最佳匹配：
如果所有
cat, os, device, country匹配：等级1如果其中任何三个匹配：等级2
如果其中任何两个匹配：等级3
如果其中任何一个匹配：等级4
如果它们都不匹配：等级5
如何在MySQL中设置上述优先级？
我想要设置优先级的查询如下：
SELECT id, uid, url, rel, title, text, cat, os, device, country, adult, pro, status FROM ads
WHERE status = 1
AND type = 0
AND budget > 0.01
AND adult = '$adult'
-- If This Conditions match Rank it 1st
AND (((cat LIKE '%$cat%' AND country LIKE '%$code%' AND os LIKE '%$os%' AND device LIKE '%$device%')
OR (cat LIKE '%$cat%' AND country = 0 AND os = 0 AND device = 0)
OR (cat = 0 AND country LIKE '%$code%' AND os = 0 AND device = 0)
OR (cat = 0 AND country = 0 AND os LIKE '%$os%' AND device = 0)
OR (cat = 0 AND country = 0 AND os = 0 AND device LIKE '%$device%'))
-- If This Conditions match Rank it 2nd
OR ((cat LIKE '%$cat%' AND country LIKE '%$code%' AND os = 0 AND device = 0)
OR (cat LIKE '%$cat%' AND country = 0 AND os LIKE '%$os%' AND device = 0)
OR (cat LIKE '%$cat%' AND country = 0 AND os = 0 AND device LIKE '%$device%')
OR (cat = 0 AND country LIKE '%$code%' AND os LIKE '%$os%' AND device = 0)
OR (cat = 0 AND country LIKE '%$code%' AND os = 0 AND device LIKE '%$device%')
OR (cat = 0 AND country = 0 AND os LIKE '%$os%' AND device LIKE '%$device%'))
-- If This Conditions match Rank it 3rd
OR ((cat LIKE '%$cat%' AND country LIKE '%$code%' AND os LIKE '%$os%' AND device = 0)
OR (cat LIKE '%$cat%' AND country LIKE '%$code%' AND os = 0 AND device LIKE '%$device%')
OR (cat LIKE '%$cat%' AND country = 0 AND os LIKE '%$os%' AND device LIKE '%$device%')
OR (cat = 0 AND country LIKE '%$code%' AND os LIKE '%$os%' AND device LIKE '%$device%'))
-- If This Conditions match Rank it 4th
OR (cat = 0 AND country = 0 AND os = 0 AND device = 0))
ORDER BY RAND() LIMIT 1
答案 0 :(得分：0)
您需要使用相同的条件来生成如下列：
select id, uid, url, rel, title, text, cat, os, device, country, adult, pro, status, if(cat = 0 AND country = 0 AND os = 0 AND device = 0, 4, if(<conditions for rank 3>, 3, if(<conditions for rank 2>, 2, 1))) as rank FROM ads ...
希望你明白了。