MySQL 5..0.88/Coldfusion8
我在继承的网站上有一个产品表。
我需要多次查询表格以在搜索表单中填写默认值并进行实际搜索。
我所有的查询基本上都是一样的,吃了很多时间。唯一改变的是被查询的参数,实际的查询设置没有改变,所以我希望这可以以某种方式捆绑在一个查询中以避免运行查询 x 来获取值 A,然后运行查询 x 到获得价值 B 等等....
我的转储查询如下所示:
// 1/6 queries - get all company names based on active products
SELECT art.firma
FROM artikelstammdaten AS art USE INDEX (i_firma)
// join pricelists to exclude seller if pricelists applicable but user not authorized
LEFT JOIN preislisten p ON
p.iln = art.iln
AND p.ean = art.ean
// dynamic list of seller IDs and pricelist name
AND ( ( p.preisliste = "name1" AND p.iln= "12345" ) OR ( p.preisliste = "name2" AND p.iln= "98765" ) OR (1=0) )
WHERE art.aktiv = "ja"
// if pricelists apply, only take products with a pice not zero
AND ( IF( art.iln IN ( 12345,98765), p.preisliste IS NOT NULL,1 ) )
// exclude demo
AND art.iln != "111" AND art.iln != "222" AND art.iln != "777"
// sellers free to order or authorization ok
AND (art.modus = "OPEN" OR art.iln IN ( 12345,98765) )
// inventory
AND ( art.bestand != "0" ) AND art.vororder = "0"
// order mode
AND ( art.vororder = 'nein' OR art.vororder = 'no' )
GROUP BY art.firma
运行后,我必须再次运行它才能获得:
art.marke= brandnames
art.preis_aktuell = minimum buying price
art.preis_vk = maximum buying price
... 4 more
我一直在尝试使用这样的子查询来做到这一点:
SELECT DISTINCT
( SELECT art.firma ) AS firma
,( SELECT art.marke ) AS marke
,( SELECT MIN(art.preis_aktuell) ) AS ak_min
,( SELECT MAX(art.preis_aktuell) ) AS ak_max
,( SELECT MIN(art.preis_vk) ) AS vk_min
,( SELECT MAX(art.preis_vk) ) AS vk_max
,( SELECT ROUND(MIN( 100*( ( art.preis_ek - art.preis_aktuell ) / art.preis_ek ) ))) AS reb_min
,( SELECT ROUND(MAX( 100*( ( art.preis_ek - art.preis_aktuell ) / art.preis_ek ) ))) AS reb_max
FROM artikelstammdaten AS art USE INDEX (i_iln,)
....
GROUP BY art.marke
ORDER BY COUNT(art.marke) DESC;
但我无法让它工作,因为我只得到一条记录(对于最小值/最大值来说还可以,但对于 x-sellers、y-brands 和 20 种尺寸来说不行。我认为这是因为我不知道如何对子查询进行分组,所以:
问题:
是否可以bundle
使用子查询/其他方式将上述查询合并为单个查询?我怎么能GROUP BY
这样我就不会得到一个结果记录?
感谢您的帮助!
编辑:
也许有。改为SELECT DISTINCT
和GROUPB BY
(见上文)。现在的问题是如何对特定列进行排序以及结果是否有效(现在检查)
EDIT2:
这是表"Articles"
和"Pricelists"
. 文章包括基本产品,包括基本价格,价格表包含替代价格,可以分配给用户。
文章创建(字段为德语,我将上述查询转换回德语)
CREATE TABLE `articles` (
`id` INT(11) NOT NULL AUTO_INCREMENT,
`iln` VARCHAR(13) NULL DEFAULT NULL,
`ean` VARCHAR(35) NULL DEFAULT NULL,
`artikelnummer` VARCHAR(35) NULL DEFAULT NULL,
`artikelbezeichnung` VARCHAR(70) NULL DEFAULT NULL,
`artikelbezeichnung_lang` VARCHAR(255) NULL DEFAULT NULL,
`groesse` VARCHAR(10) NULL DEFAULT NULL,
`farbe` VARCHAR(35) NULL DEFAULT NULL,
`farbnummer` VARCHAR(10) NULL DEFAULT NULL,
`material` VARCHAR(70) NULL DEFAULT NULL,
`preis_ek` DECIMAL(12,2) NULL DEFAULT NULL,
`preis_vk` DECIMAL(12,2) NULL DEFAULT NULL,
`preis_aktuell` DECIMAL(12,2) NULL DEFAULT NULL,
`einheit` VARCHAR(3) NULL DEFAULT NULL,
`firma` VARCHAR(35) NULL DEFAULT NULL,
`marke` VARCHAR(35) NULL DEFAULT NULL,
`warengruppe1` VARCHAR(35) NULL DEFAULT NULL,
`warengruppe2` VARCHAR(35) NULL DEFAULT NULL,
`warengruppe3` VARCHAR(35) NULL DEFAULT NULL,
`groessenlauf` VARCHAR(35) NULL DEFAULT NULL,
`bildpfad` VARCHAR(255) NULL DEFAULT NULL,
`bilddateiname` VARCHAR(255) NULL DEFAULT NULL,
`nos` VARCHAR(4) NULL DEFAULT NULL,
`nos_anzeige` VARCHAR(4) NULL DEFAULT NULL,
`aktiv` VARCHAR(4) NULL DEFAULT NULL,
`vororder` VARCHAR(4) NULL DEFAULT 'Nein',
`highlight` VARCHAR(4) NULL DEFAULT NULL,
`modus` VARCHAR(4) NULL DEFAULT NULL,
`bestand` DECIMAL(10,0) NULL DEFAULT '0',
`last_import` DATETIME NULL DEFAULT NULL,
`last_update` DATETIME NULL DEFAULT NULL,
PRIMARY KEY (`id`),
INDEX `i_iln` (`iln`),
INDEX `i_iln_id` (`id`, `iln`),
INDEX `i_aktiv` (`aktiv`),
INDEX `i_bestand` (`bestand`),
INDEX `i_artikelnummer` (`artikelnummer`),
INDEX `i_artikelbezeichnung` (`artikelbezeichnung`),
INDEX `i_artikelbezeichnung_lang` (`artikelbezeichnung_lang`),
INDEX `i_farbe` (`farbe`),
INDEX `i_groesse` (`groesse`),
INDEX `i_preis_aktuell` (`preis_aktuell`),
INDEX `i_preis_vk` (`preis_vk`),
INDEX `i_warengruppe1` (`warengruppe1`),
INDEX `i_warengruppe2` (`warengruppe2`),
INDEX `i_nos` (`nos`),
INDEX `i_modus` (`modus`),
INDEX `i_firma` (`firma`),
INDEX `i_marke` (`marke`),
INDEX `i_highlight` (`highlight`),
INDEX `i_preis_ek` (`preis_ek`),
INDEX `i_warengruppe3` (`warengruppe3`),
INDEX `i_farbnummer` (`farbnummer`),
INDEX `i_ean` (`ean`),
INDEX `i_vororder` (`vororder`)
)
COLLATE='latin1_swedish_ci'
ENGINE=InnoDB
AUTO_INCREMENT=1;
价目表 CREATE
CREATE TABLE `preislisten` (
`id` INT(11) NOT NULL AUTO_INCREMENT,
`iln` VARCHAR(13) NULL DEFAULT NULL,
`preisliste` VARCHAR(35) NULL DEFAULT NULL,
`bezeichnung` VARCHAR(35) NULL DEFAULT NULL,
`EAN` VARCHAR(14) NULL DEFAULT NULL,
`waehrung` VARCHAR(3) NULL DEFAULT NULL,
`ek` DECIMAL(18,3) NULL DEFAULT NULL,
`vk` DECIMAL(18,3) NULL DEFAULT NULL,
`onlinepreis` DECIMAL(18,3) NULL DEFAULT NULL,
PRIMARY KEY (`id`),
INDEX `i_iln` (`iln`),
INDEX `ind_onlinepreis` (`onlinepreis`)
)
COLLATE='latin1_swedish_ci'
ENGINE=InnoDB
AUTO_INCREMENT=1;
选择
SELECT DISTINCT
( SELECT art.firma ) AS comp
,( SELECT art.marke ) AS marke
,( SELECT MIN(art.preis_aktuell) ) AS ak_min
,( SELECT MAX(art.preis_aktuell) ) AS ak_max
,( SELECT MIN(art.preis_vk) ) AS vk_min
,( SELECT MAX(art.preis_vk) ) AS vk_max
,( SELECT ROUND(MIN( 100*( ( art.preis_ek - art.preis_aktuell ) / art.preis_ek ) ))) AS reb_min
,( SELECT ROUND(MAX( 100*( ( art.preis_ek - art.preis_aktuell ) / art.preis_ek ) ))) AS reb_max
FROM artikelstammdaten AS art USE INDEX (i_
LEFT JOIN preislisten p ON
p.iln = art.iln
AND p.ean = art.ean
AND ( ( p.preisliste = "-Standard-" AND p.iln = "9900000003005" ) OR ( p.preisliste = "-Standard-" AND p.iln = "2222222222222" ) OR (1=0) )
WHERE art.aktiv = "ja"
AND ( IF( art.iln IN ( 9900000003005,2222222222222 ), p.onlinepreis IS NOT NULL,1 ) )
AND art.iln != "1111111111111" AND art.iln != "2222222222222" AND art.iln != "7777777777777"
AND (art.modus = "OPEN"
OR art.iln IN ( 9900000003005,2222222222222 )
)
AND ( art.bestand != "0" OR ( ( art.nos = "JA" OR art.nos = "YES" ) AND art.nos_anzeige = "JA" ) ) AND art.vororder = "nein"
AND ( art.vororder = 'nein' OR art.vororder = 'no' )
解释选择
"id "select_type" "table" "type" "possible_keys" "key" "key_len" "ref" "rows" "Extra"
"1" "SIMPLE" "art" "ref" "i_iln,i_aktiv,i_bestand,i_nos,i_modus,i_vororder" "i_aktiv" "7" "const" "16844" "Using where; Using temporary; Using filesort"
"1" "SIMPLE" "p" "ref" "i_iln" "i_iln" "16" "db.art.iln" "1075" "Using where"
行。大量数据...如果您有任何问题,请告诉我。上的indecesarticles
似乎有点多。时间杀手是带有价目表的 LEFT JOIN。没有这个,查询会很快,但这种情况很少见。
谢谢参观!如果有人可以就如何加快速度给我一个很好的答案,我会赏金!
编辑 3:
我添加了Unique index
. 现在重新运行查询EXPLAIN
是:
"id" "select_type" "table" "type" "possible_keys" "key" "key_len" "ref" "rows" "Extra"
"1" "SIMPLE" "art" "ref" "i_iln,i_aktiv,i_bestand,i_nos,i_modus,i_vororder" "i_aktiv" "7" "const" "15409" "Using where; Using temporary; Using filesort"
"1" "SIMPLE" "p" "ref" "i_iln_ean,i_iln" "i_iln_ean" "33" "db.art.iln,db.art.ean" "1" "Using where"
好像快了一点。执行时间降至 0,所以我想这是一个好兆头:-)。问题:我是否也应该将此索引添加到文章表中。那里也将是独一无二的。