嘿伙计们我正在尝试使用一个只包含URLS的表中的数据来查看我的主表中是否存在任何变量或使用它们
url │··························································································
--------------------------------------- │··························································································
.0.9.40.52 │··························································································
.00000000314.0000000265.00000225.0323 │··························································································
.001916.com │··························································································
.00386.com │··························································································
.00-5dj-ar4c.club │··························································································
.007band.ru │··························································································
.007crconcert-japan.com │··························································································
.007pi.com │··························································································
.00dt7myo.work │··························································································
.00dzhqbghr.com │··························································································
(10 rows)
主表
user_id | campaign_id | url
| send_time
---------+-------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
--------------------------------+---------------------
8468677 | 1004001 | http://twitter.com/share?url=http%3A%2F%2Fatwonline.com%2Faircraft-orders-deliveries%2Fnigeria-s-arik-air-replaces-boeing-747s-787s&text=Nigeria%E2%80%99s+Arik+Air+replaces+Boeing+74
7s+with+787s&count=none | 2017-01-28 13:01:28
8468677 | 1003945 | http://twitter.com/share?url=http%3A%2F%2Fatwonline.com%2Fairframes%2Fairbaltic-cs300-performance-exceeding-expectations&text=AirBaltic%3A+CS300+performance+%E2%80%98exceeding+expect
ations%E2%80%99&count=none | 2017-01-14 13:03:29
8468677 | 1004189 | http://twitter.com/share?url=http%3A%2F%2Fatwonline.com%2Fairframes%2Famerican-again-defers-a350-deliveries-first-pushed-back-2020&text=American+again+defers+A350+deliveries%3B+first
+pushed+back+to+2020&count=none | 2017-05-02 12:02:04
8468677 | 1004057 | http://twitter.com/share?url=http%3A%2F%2Fatwonline.com%2Fairframes%2Fatlas-has-acquired-all-20-767s-be-operated-amazon&text=Atlas+has+acquired+all+20+767s+to+be+operated+for+Amazon&
count=none | 2017-02-28 13:02:13
(4 rows)
我试图运行以下
select t1.user_id,t1.campaign_id,t1.url
from madison_alldb as t1
inner join madison_url as t2
ON t1.url LIKE CONCAT('%',t1.url, '%');
但是当我回到我的tmux时，它只是说杀了......我也不确定上述是否会起作用。
我的目标是只拥有一个域的用户限制，该域是我的URL表中的通配符匹配。
答案 0 :(得分：1)
这种类型的查询很难优化。一个小的优化是使用exists而不是join：
select ma.*
from madison_alldb ma
where exists (select 1
from madison_url mu
where ma.url like concat('%', mu.url, '%')
)
limit 10;
但是，这仍然需要进行嵌套循环连接。唯一的区别是匹配时的比较较少。