我有以下表结构：
CREATE TABLE listing_attributes (
id INT PRIMARY KEY NOT NULL AUTO_INCREMENT,
listing_id INT,
attribute_id INT,
value LONGTEXT,
FOREIGN KEY ( attribute_id )
REFERENCES item_type_attributes ( id )
ON DELETE CASCADE ON UPDATE CASCADE,
FOREIGN KEY ( listing_id )
REFERENCES listing( id )
ON DELETE CASCADE ON UPDATE CASCADE
);
CREATE INDEX attribute_fk ON listing_attributes ( attribute_id );
CREATE INDEX listing_fk ON listing_attributes ( listing_id );
和这一个：
CREATE TABLE vw_search(
listing_type_css_class VARCHAR(45),
override_listing_image_url VARCHAR(200),
override_listing_image TINYINT DEFAULT 0,
listing_type_priority INT DEFAULT 0,
main_image VARCHAR(255),
title VARCHAR(255),
new_listing INT,
listing_type_name VARCHAR(100),
location_name VARCHAR(255),
location_group VARCHAR(100),
location_id INT DEFAULT 0,
create_date TIMESTAMP DEFAULT '0000-00-0000:00:00' NOT NULL,
expiry_date DATETIME,
has_expired INT,
should_show INT,
price DECIMAL(19,2) NOT NULL,
description LONGTEXT,
view_count INT DEFAULT 0 NOT NULL,
id INT DEFAULT 0 NOT NULL,
category_id INT NOT NULL,
created_by_user_id INT NOT NULL,
dealer_id INT DEFAULT 0,
disable_price_in_listings TINYINT DEFAULT 0,
business_image VARCHAR(200),
non_expiry INT DEFAULT 0
);
运行的查询是：
SELECT COUNT(DISTINCT id) as total
FROM (
SELECT * ,
( select value
from listing_attributes
where attribute_id=81
and listing_id=l.id
) as '81',
( select value
from listing_attributes
where attribute_id=78
and listing_id=l.id
) as '78'
from vw_search l
WHERE category_id IN
('884','882','880','885','871','949','873','875','876','434','424','422','423','425','426','546','750','752',
'754','756','759','763','766','774','947','770','778','783','781','786','428','547','430','431','414','415',
'712','420','548','432','433','418','419','959','961','960','358','359','360','364','361','363','357','1003',
'560','1002','1006','1004','1007','1005','561','377','380','553','554','555','1021','556','557','559','558',
'435','436','437','438','439','441','443','550','442','549','444','445','446','447','448','449','450','451',
'714','452','551','453','454','455','456','615','459','460','461','462','463','464','468','469','466','467',
'470','811','472','816','473','813','728','476','474','799','795','803','721','806','475','477','1009','479',
'480','481','482','828','483','484','485','385','384','386','387','388','389','1018','833','500','504','502',
'501','503','487','488','489','490','491','1020','493','494','495','498','497','496','421','975','1000','976',
'973','977','951','511','512','509','513','515','514','838','840','412','413','1016','1014','1019','86','399'
,'397','398','1008','521','522','526','523','524','525','528','1053','535','529','530','850','533','532','1052',
'969','968','966','965','539','538','967','1012','1013','1011','1024','1022','1023','541','542','545','543','544',
'297','296','298','300','299','301','302','303','304','305','306','307','308','318','310','311','314','319','356','312',
'313','315','316','317','717','941','718','723','726','719','38')
) as t
WHERE ( `81` LIKE CONCAT('%','Honda','%') )
AND ( `78` BETWEEN CONVERT('1900', UNSIGNED INTEGER)
AND CONVERT('2014', UNSIGNED INTEGER) )
AND (price BETWEEN CONVERT('2000', UNSIGNED INTEGER)
AND CONVERT('5000', UNSIGNED INTEGER) )
AND (has_expired=0 OR non_expiry = 1)
AND should_show=1
显然，这个查询效率不高，并且需要花费大量时间来执行。请建议我优化它的最佳方法。
根据下面的peterm添加EXPLAIN命令的结果：
id,select_type,table,type,possible_keys,key,key_len,ref,rows,Extra
1,PRIMARY,<derived2>,ALL,NULL,NULL,NULL,NULL,3386,"Using where; Using temporary; Using filesort"
2,DERIVED,l,ALL,category_fk,NULL,NULL,NULL,4660,"Using where"
2,DERIVED,u,eq_ref,PRIMARY,PRIMARY,4,tradezone.l.created_by_user_id,1,
2,DERIVED,lt,eq_ref,PRIMARY,PRIMARY,4,tradezone.l.listing_type_id,1,
2,DERIVED,<derived5>,ALL,NULL,NULL,NULL,NULL,5021,
5,DERIVED,l,ALL,NULL,NULL,NULL,NULL,4660,
5,DERIVED,lt,eq_ref,PRIMARY,PRIMARY,4,tradezone.l.listing_type_id,1,
5,DERIVED,bi,eq_ref,"user_unique,user_fk_idx,user_id",user_unique,4,tradezone.l.created_by_user_id,1,
5,DERIVED,u,eq_ref,PRIMARY,PRIMARY,4,tradezone.l.created_by_user_id,1,
5,DERIVED,lo,eq_ref,PRIMARY,PRIMARY,4,tradezone.l.location_id,1,
5,DERIVED,c,eq_ref,PRIMARY,PRIMARY,4,tradezone.l.category_id,1,
5,DERIVED,hd,ref,hot_deals_listing_fk_idx,hot_deals_listing_fk_idx,4,tradezone.l.id,1,
9,"DEPENDENT SUBQUERY",lp,ref,listing_id_fk,listing_id_fk,4,tradezone.l.id,1,"Using where; Using filesort"
8,"DEPENDENT SUBQUERY",p,ref,listing_id_idx,listing_id_idx,5,tradezone.l.id,1,"Using where; Using filesort"
6,"DEPENDENT SUBQUERY",p,ref,listing_id_idx,listing_id_idx,5,tradezone.l.id,1,"Using where; Using filesort"
3,"DEPENDENT SUBQUERY",listing_attributes,ref,"listing_fk,attribute_fk",listing_fk,5,func,2,"Using where"
答案 0 :(得分：1)
尝试以这种方式重写此查询：
SELECT distincd( id )
FROM vw_search l
JOIN listing_attributes l81
ON l81.listing_id=l.id AND l81.attribute_id=81
AND l81.value LIKE CONCAT('%','Honda','%')
JOIN listing_attributes l78
ON l78.listing_id=l.id AND l78.attribute_id=78
AND l78.value BETWEEN CONVERT('1900', UNSIGNED INTEGER)
AND CONVERT('2014', UNSIGNED INTEGER)
WHERE l.category_id IN ('884','882','880' .......
.........................
.......................,'719','38' )
AND l.price BETWEEN CONVERT('2000', UNSIGNED INTEGER)
AND CONVERT('5000', UNSIGNED INTEGER)
AND (l.has_expired=0 OR l.non_expiry = 1)
AND l.should_show=1