i want to get best way to get result from this query
here is my tables instructrue
schools
CREATE TABLE `schools` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`user` mediumint(5) NOT NULL,
`gender` tinyint(1) NOT NULL,
`time` int(11) NOT NULL,
`status` tinyint(2) NOT NULL,
`number` mediumint(6) NOT NULL,
`name` varchar(75) NOT NULL,
`address` varchar(75) NOT NULL,
`admin` varchar(50) NOT NULL,
`admin_phone` varchar(20) NOT NULL,
`admin_email` varchar(30) NOT NULL,
`school_phone` varchar(20) NOT NULL,
`learn` tinyint(2) NOT NULL,
`mr7la` tinyint(2) NOT NULL,
`sfof` smallint(3) NOT NULL,
`fswl` smallint(3) NOT NULL,
`json` text NOT NULL,
PRIMARY KEY (`id`),
UNIQUE KEY `user` (`user`),
KEY `status` (`status`),
KEY `learn` (`learn`),
KEY `mr7la` (`mr7la`),
KEY `number` (`number`)
) ENGINE=MyISAM AUTO_INCREMENT=20 DEFAULT CHARSET=utf8
3agz
CREATE TABLE `3agz` (
`id` bigint(20) NOT NULL AUTO_INCREMENT,
`school` int(11) NOT NULL,
`tkss` int(11) NOT NULL,
`teacher_7ess` int(11) NOT NULL,
`teacher_master_7ess` int(11) NOT NULL,
`time_added` int(11) NOT NULL,
`reported` int(11) NOT NULL DEFAULT '0',
`fixed` int(11) NOT NULL,
`info` text NOT NULL,
PRIMARY KEY (`id`),
UNIQUE KEY `school` (`school`,`tkss`,`teacher_7ess`,`fixed`),
KEY `school_2` (`school`),
KEY `tkss` (`tkss`),
KEY `reported` (`reported`),
KEY `time_added` (`time_added`),
KEY `school_3` (`school`,`time_added`),
KEY `school_4` (`school`,`fixed`)
) ENGINE=InnoDB AUTO_INCREMENT=85 DEFAULT CHARSET=utf8
here's SQL Fiddle for this
http://sqlfiddle.com/#!2/3313e0/4
you can see her's my sql query i use
SELECT
schools.* , ( select count(id) from 3agz where 3agz.school = schools.id and fixed = 0 ) as has_3agz
FROM
schools
WHERE
( select count(id) from 3agz where 3agz.school = schools.id and fixed = 0 ) > 0
limit 10
the explain is
schools => PRIMARY : ALL
3agz => DEPENDENT SUBQUERY : ref
3agz => DEPENDENT SUBQUERY : ref
here's i ask can i do this and what's the best way
1 - can i get ignore second sub query on where and get it depended on first sub query in select
2- if number 1 answer is you can't can i ignore the first sub query [ has_3agz alias ] after this query executed i loop trow the result [schools ids]
and make second query like this
as example the first query return school ids 1 , 2 , 3 , 4
select school , count(id) from 3agz where school in ( 1 , 2 , 3 , 4 ) and fixed = 0
the attach every count to it's school in array
hope you understand me
Best regards
SELECT schools.*, count(*) as has_3agz from schools
LEFT JOIN 3agz on 3agz.school = schools.id and fixed = 0
GROUP BY schools.id;
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.