SQL Select 来自 table 的最新结果，其中关键字 = 和竞争对手 =
SQL Select latest result from table where keyword = and competitor =
我有两个 table：
tablename: input_keywords
Cols: keyword, last_check, pages_deep, check_freq_days
tablename: rank_result
Cols: keyword, result_url, position, last_check, competitor
input_keywords.keyword 是唯一的，因此我们不会查找多个关键字。
rank_result 保留我们抓取的所有数据并存储一些元数据。
我需要显示以下内容
a = input_keywords
b = rank_result
a.keyword, a.last_check, b.position WHERE b.competitor = 'xxx'
但只有 select 来自 rank_result
的最后/最近结果
我尝试遵循其他几个答案，但没有得到我期望的结果。
更新1
CREATE TABLE `input_keywords` (
`id` int(11) unsigned NOT NULL AUTO_INCREMENT,
`keyword` char(150) DEFAULT NULL COMMENT 'the keyword....',
`last_check` timestamp NULL DEFAULT '2000-01-01 00:00:00' COMMENT 'Last check timestamp, default to years ago so we check immediatly',
`CREATION` timestamp NULL DEFAULT CURRENT_TIMESTAMP,
`MODIFICATION` timestamp NULL DEFAULT NULL ON UPDATE CURRENT_TIMESTAMP,
`p_deep` int(1) DEFAULT '5' COMMENT 'how many pages deep to search - default 5',
`check_freq_days` int(11) DEFAULT '3' COMMENT 'how often to check this keyword in DAYS default 3',
`type` char(50) DEFAULT NULL COMMENT 'Product, Category, other etc',
PRIMARY KEY (`id`),
UNIQUE KEY `UNQ_Keyword` (`keyword`)
) ENGINE=InnoDB AUTO_INCREMENT=5865 DEFAULT CHARSET=utf8;
CREATE TABLE `rank_result` (
`id` int(11) unsigned NOT NULL AUTO_INCREMENT,
`keyword` char(150) DEFAULT '',
`result_url` text,
`position` int(11) DEFAULT NULL,
`check_time` timestamp NULL DEFAULT CURRENT_TIMESTAMP,
`useragent_used` char(255) DEFAULT NULL,
`proxy_log` text,
`check_date` date DEFAULT NULL COMMENT 'date of the check - easier for graph plotting',
`competitor` tinytext,
PRIMARY KEY (`id`),
KEY `idx_KEYWORD` (`keyword`),
KEY `keyword` (`keyword`,`check_time`,`competitor`(50))
) ENGINE=InnoDB AUTO_INCREMENT=2868936 DEFAULT CHARSET=utf8;
input_keywords
的示例内容
----------------------------------------------------------------------------------------------------------------------------------
| id | keyword | last_check | CREATION | MODIFICATION | p_deep | check_freq_days | type |
----------------------------------------------------------------------------------------------------------------------------------
| 1 | acoustic guitars | 2017-03-07 17:03:55 | 2017-01-20 12:27:17 | 2017-03-07 17:03:55 | 5 | 1 | NULL |
----------------------------------------------------------------------------------------------------------------------------------
| 2 | guitar accessories | 2017-03-05 11:03:49 | 2017-01-20 12:27:27 | 2017-03-05 11:03:49 | 5 | 3 | NULL |
----------------------------------------------------------------------------------------------------------------------------------
| 3 | guitar amps | 2017-03-05 11:04:05 | 2017-01-20 12:27:33 | 2017-03-05 11:04:06 | 5 | 3 | NULL |
----------------------------------------------------------------------------------------------------------------------------------
| 4 | guitar strings | 2017-03-05 13:03:51 | 2017-01-20 12:27:42 | 2017-03-05 13:03:51 | 5 | 3 | NULL |
----------------------------------------------------------------------------------------------------------------------------------
| 5 | guitar effects pedals | 2017-03-05 11:03:43 | 2017-01-20 12:27:50 | 2017-03-05 11:03:43 | 5 | 3 | NULL |
----------------------------------------------------------------------------------------------------------------------------------
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| id | keyword | result_url | position | check_time | useragent_used | proxy_log | check_date | competitor |
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| 493 | acoustic guitars | http://www.competitor.com/… | 1 | 2017-01-18 09:36:17 | Mozilla/5.0 (compatible; MSIE 10.0;… | NULL | 2017-01-18 | Competitor1 |
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| 494 | acoustic guitars | http://competitor2.com… | 2 | 2017-01-18 09:36:17 | Mozilla/5.0 (compatible; MSIE 10.0;… | NULL | 2017-01-18 | Competitor2 |
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| 495 | acoustic guitars | https://out_website.com | 3 | 2017-01-18 09:36:17 | Mozilla/5.0 (compatible; MSIE 10.0;… | NULL | 2017-01-18 | US |
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| 496 | acoustic guitars | http://competitor3.com | 4 | 2017-01-18 09:36:17 | Mozilla/5.0 (compatible; MSIE 10.0;… | NULL | 2017-01-18 | Competitor3 |
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| 497 | acoustic guitars | http://competitor4.com | 5 | 2017-01-18 09:36:17 | Mozilla/5.0 (compatible; MSIE 10.0;… | NULL | 2017-01-18 | NULL |
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| 498 | acoustic guitars | https://www.amazon.co.uk/acoustic-g… | 6 | 2017-01-18 09:36:17 | Mozilla/5.0 (compatible; MSIE 10.0;… | NULL | 2017-01-18 | Amazon |
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| 499 | acoustic guitars | http://compx.com | 7 | 2017-01-18 09:36:17 | Mozilla/5.0 (compatible; MSIE 10.0;… | NULL | 2017-01-18 | compX |
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| 500 | acoustic guitars | http://compx.com | 8 | 2017-01-18 09:36:17 | Mozilla/5.0 (compatible; MSIE 10.0;… | NULL | 2017-01-18 | compX |
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| 501 | acoustic guitars | http://www. compx.com/ | 9 | 2017-01-18 09:36:17 | Mozilla/5.0 (compatible; MSIE 10.0;… | NULL | 2017-01-18 | NULL |
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| 502 | acoustic guitars | http://www. compx.com… | 10 | 2017-01-18 09:36:17 | Mozilla/5.0 (compatible; MSIE 10.0;… | NULL | 2017-01-18 | NULL |
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| 503 | acoustic guitars | http://www. compx.com/ | 11 | 2017-01-18 09:36:17 | Mozilla/5.0 (compatible; MSIE 10.0;… | NULL | 2017-01-18 | NULL |
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| 504 | acoustic guitars | http://www. compx.com… | 12 | 2017-01-18 09:36:17 | Mozilla/5.0 (compatible; MSIE 10.0;… | NULL | 2017-01-18 | NULL |
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
这个table记录了我们查看关键字排名的每一天
（所以同一个关键字和竞争对手有很多记录）
如果我们有排名，我只需要我们的排名，否则 return 只需要关键字。
我的理想输出是
|keyword | last_check | p_deep | check_freq_days | position |
|keyword1 | 2017-03-06 | 5 |. 3. | 4. |
|keyword2 | 2017-03-06 | 5. |. 3. | NULL. |
我最好的尝试是：
select input_keywords.keyword, input_keywords.last_check, input_keywords.p_deep, `input_keywords`.`check_freq_days`, rank_result.position from input_keywords join rank_result on input_keywords.keyword=rank_result.keyword where rank_result.competitor = 'OurCompany' and input_keywords.last_check=rank_result.check_time
这几乎有效，但如果我们未被列出，则不会 return 结果。
因为我是从 input_keywords table 开始的，所以我希望列出所有关键字，以及我们当前的排名（如果有的话）。
添加 rank_result_id 字段作为主要字段并自动递增
添加字段后获取数据 ORDER BY rank_result_id DESC
我已经通过执行以下操作解决了这个问题。
- 将竞争对手字段添加到
input_keywords table
- 添加了一些索引以加快查询速度
创建了以下内容SQL
SELECT i.`keyword`, i.`last_check`, i.`p_deep`, i.`check_freq_days`, r.`position`
FROM input_keywords i
LEFT JOIN rank_result r
ON i.`keyword` = r.`keyword` AND i.`competitor` = r.`competitor` AND i.`last_check` = r.`check_time`
然后 returns 每个输入关键字一行，我们在排名中的最后已知位置
我有两个 table：
tablename: input_keywords
Cols: keyword, last_check, pages_deep, check_freq_days
tablename: rank_result
Cols: keyword, result_url, position, last_check, competitor
input_keywords.keyword 是唯一的，因此我们不会查找多个关键字。
rank_result 保留我们抓取的所有数据并存储一些元数据。
我需要显示以下内容
a = input_keywords
b = rank_result
a.keyword, a.last_check, b.position WHERE b.competitor = 'xxx'
但只有 select 来自 rank_result
的最后/最近结果我尝试遵循其他几个答案，但没有得到我期望的结果。
更新1
CREATE TABLE `input_keywords` (
`id` int(11) unsigned NOT NULL AUTO_INCREMENT,
`keyword` char(150) DEFAULT NULL COMMENT 'the keyword....',
`last_check` timestamp NULL DEFAULT '2000-01-01 00:00:00' COMMENT 'Last check timestamp, default to years ago so we check immediatly',
`CREATION` timestamp NULL DEFAULT CURRENT_TIMESTAMP,
`MODIFICATION` timestamp NULL DEFAULT NULL ON UPDATE CURRENT_TIMESTAMP,
`p_deep` int(1) DEFAULT '5' COMMENT 'how many pages deep to search - default 5',
`check_freq_days` int(11) DEFAULT '3' COMMENT 'how often to check this keyword in DAYS default 3',
`type` char(50) DEFAULT NULL COMMENT 'Product, Category, other etc',
PRIMARY KEY (`id`),
UNIQUE KEY `UNQ_Keyword` (`keyword`)
) ENGINE=InnoDB AUTO_INCREMENT=5865 DEFAULT CHARSET=utf8;
CREATE TABLE `rank_result` (
`id` int(11) unsigned NOT NULL AUTO_INCREMENT,
`keyword` char(150) DEFAULT '',
`result_url` text,
`position` int(11) DEFAULT NULL,
`check_time` timestamp NULL DEFAULT CURRENT_TIMESTAMP,
`useragent_used` char(255) DEFAULT NULL,
`proxy_log` text,
`check_date` date DEFAULT NULL COMMENT 'date of the check - easier for graph plotting',
`competitor` tinytext,
PRIMARY KEY (`id`),
KEY `idx_KEYWORD` (`keyword`),
KEY `keyword` (`keyword`,`check_time`,`competitor`(50))
) ENGINE=InnoDB AUTO_INCREMENT=2868936 DEFAULT CHARSET=utf8;
input_keywords
的示例内容----------------------------------------------------------------------------------------------------------------------------------
| id | keyword | last_check | CREATION | MODIFICATION | p_deep | check_freq_days | type |
----------------------------------------------------------------------------------------------------------------------------------
| 1 | acoustic guitars | 2017-03-07 17:03:55 | 2017-01-20 12:27:17 | 2017-03-07 17:03:55 | 5 | 1 | NULL |
----------------------------------------------------------------------------------------------------------------------------------
| 2 | guitar accessories | 2017-03-05 11:03:49 | 2017-01-20 12:27:27 | 2017-03-05 11:03:49 | 5 | 3 | NULL |
----------------------------------------------------------------------------------------------------------------------------------
| 3 | guitar amps | 2017-03-05 11:04:05 | 2017-01-20 12:27:33 | 2017-03-05 11:04:06 | 5 | 3 | NULL |
----------------------------------------------------------------------------------------------------------------------------------
| 4 | guitar strings | 2017-03-05 13:03:51 | 2017-01-20 12:27:42 | 2017-03-05 13:03:51 | 5 | 3 | NULL |
----------------------------------------------------------------------------------------------------------------------------------
| 5 | guitar effects pedals | 2017-03-05 11:03:43 | 2017-01-20 12:27:50 | 2017-03-05 11:03:43 | 5 | 3 | NULL |
----------------------------------------------------------------------------------------------------------------------------------
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| id | keyword | result_url | position | check_time | useragent_used | proxy_log | check_date | competitor |
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| 493 | acoustic guitars | http://www.competitor.com/… | 1 | 2017-01-18 09:36:17 | Mozilla/5.0 (compatible; MSIE 10.0;… | NULL | 2017-01-18 | Competitor1 |
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| 494 | acoustic guitars | http://competitor2.com… | 2 | 2017-01-18 09:36:17 | Mozilla/5.0 (compatible; MSIE 10.0;… | NULL | 2017-01-18 | Competitor2 |
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| 495 | acoustic guitars | https://out_website.com | 3 | 2017-01-18 09:36:17 | Mozilla/5.0 (compatible; MSIE 10.0;… | NULL | 2017-01-18 | US |
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| 496 | acoustic guitars | http://competitor3.com | 4 | 2017-01-18 09:36:17 | Mozilla/5.0 (compatible; MSIE 10.0;… | NULL | 2017-01-18 | Competitor3 |
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| 497 | acoustic guitars | http://competitor4.com | 5 | 2017-01-18 09:36:17 | Mozilla/5.0 (compatible; MSIE 10.0;… | NULL | 2017-01-18 | NULL |
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| 498 | acoustic guitars | https://www.amazon.co.uk/acoustic-g… | 6 | 2017-01-18 09:36:17 | Mozilla/5.0 (compatible; MSIE 10.0;… | NULL | 2017-01-18 | Amazon |
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| 499 | acoustic guitars | http://compx.com | 7 | 2017-01-18 09:36:17 | Mozilla/5.0 (compatible; MSIE 10.0;… | NULL | 2017-01-18 | compX |
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| 500 | acoustic guitars | http://compx.com | 8 | 2017-01-18 09:36:17 | Mozilla/5.0 (compatible; MSIE 10.0;… | NULL | 2017-01-18 | compX |
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| 501 | acoustic guitars | http://www. compx.com/ | 9 | 2017-01-18 09:36:17 | Mozilla/5.0 (compatible; MSIE 10.0;… | NULL | 2017-01-18 | NULL |
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| 502 | acoustic guitars | http://www. compx.com… | 10 | 2017-01-18 09:36:17 | Mozilla/5.0 (compatible; MSIE 10.0;… | NULL | 2017-01-18 | NULL |
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| 503 | acoustic guitars | http://www. compx.com/ | 11 | 2017-01-18 09:36:17 | Mozilla/5.0 (compatible; MSIE 10.0;… | NULL | 2017-01-18 | NULL |
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| 504 | acoustic guitars | http://www. compx.com… | 12 | 2017-01-18 09:36:17 | Mozilla/5.0 (compatible; MSIE 10.0;… | NULL | 2017-01-18 | NULL |
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
这个table记录了我们查看关键字排名的每一天 （所以同一个关键字和竞争对手有很多记录）
如果我们有排名，我只需要我们的排名，否则 return 只需要关键字。
我的理想输出是
|keyword | last_check | p_deep | check_freq_days | position |
|keyword1 | 2017-03-06 | 5 |. 3. | 4. |
|keyword2 | 2017-03-06 | 5. |. 3. | NULL. |
我最好的尝试是：
select input_keywords.keyword, input_keywords.last_check, input_keywords.p_deep, `input_keywords`.`check_freq_days`, rank_result.position from input_keywords join rank_result on input_keywords.keyword=rank_result.keyword where rank_result.competitor = 'OurCompany' and input_keywords.last_check=rank_result.check_time
这几乎有效，但如果我们未被列出，则不会 return 结果。
因为我是从 input_keywords table 开始的，所以我希望列出所有关键字，以及我们当前的排名（如果有的话）。
添加 rank_result_id 字段作为主要字段并自动递增
添加字段后获取数据 ORDER BY rank_result_id DESC
我已经通过执行以下操作解决了这个问题。
- 将竞争对手字段添加到
input_keywordstable - 添加了一些索引以加快查询速度
创建了以下内容SQL
SELECT i.`keyword`, i.`last_check`, i.`p_deep`, i.`check_freq_days`, r.`position`
FROM input_keywords i
LEFT JOIN rank_result r
ON i.`keyword` = r.`keyword` AND i.`competitor` = r.`competitor` AND i.`last_check` = r.`check_time`
然后 returns 每个输入关键字一行，我们在排名中的最后已知位置