[英]Combining 8 Complex Queries from 7 Tables into one Query
我需要通過將來自7個不同表的8個查詢合並為一個查詢來創建一個完整的報表,從而創建一個復雜的查詢。 我可以進行基本的組合,但是此查詢對我有好處。 我已經在網上瀏覽了復雜的聯接查詢,但是我來的不對...
所有的表都是通過“ plant_id”鏈接的,但是一些數據是最新的條目,一些是當月的計算條目,依此類推。下面的查詢完全可以獨立工作,但是我必須將它們合並為以下內容:
[plant_id,plant_make_id,plant_model],[current_plant_hrs,plant_hours_total],[plant_error_report],[plant_service_next],[plant_status_ddl_id],[已使用的柴油總量,消耗量],[location_id]
下面是細目分類+個別查詢:-
1 plant [ plant_id, plant_make_id, plant_model ],
SELECT `plant_id`,`plant_make_id`,`plant_model`
FROM `plant`
2 plant_hrs [ current_plant_hrs, plant_hours_total ],
A
SELECT `plant_hrs_stop`
FROM `plant_hrs` s1
WHERE `plant_hrs_date`=(SELECT MAX(s2.`plant_hrs_date`)
FROM `plant_hrs` s2
WHERE s1.`plant_id` = s2.`plant_id`)
ORDER BY `plant_id`
B
SELECT (MAX(`plant_hrs_stop`)- MIN(`plant_hrs_start`) )total_hrs
FROM`plant_hrs`
WHERE MONTH(`plant_hrs_date`)= MONTH( CURRENT_DATE )
GROUP BY`plant_id`
3 plant_error [ plant_error_report ],
SELECT `plant_error_report`
FROM `plant_error` s1
WHERE `plant_error_date`=(SELECT MAX(s2.`plant_error_date`)
FROM `plant_error` s2
WHERE s1.`plant_id` = s2.`plant_id`)
ORDER BY `plant_id`
4 plant_service [ plant_service_next ],
SELECT `plant_service_hrs` , `plant_service_next`
FROM `plant_service` s1
WHERE `plant_service_date`=(SELECT MAX(s2.`plant_service_date`)
FROM `plant_service` s2
WHERE s1.`plant_id` = s2.`plant_id`)
ORDER BY `plant_id`
5 plant_status [ plant_status_ddl_id ],
SELECT `plant_status_ddl_id`
FROM `plant_status`
WHERE `plant_status_date` = ( CURRENT_DATE ) - 1
GROUP BY `plant_id
6 diesel [ total diesel used, consumption ], // 'plant_id = diesel_vehicle_no'
SELECT (SUM(`diesel_qty`) )total_d
FROM`diesel`
WHERE MONTH(`diesel_date`)= MONTH( CURRENT_DATE )
GROUP BY `diesel_vehicle_no`
7 plant_location [ location_id ]
SELECT `location_id` FROM `plant_location`
ORDER BY `plant_id`
任何幫助將非常感激...
好的,讓我們看一下:我們將簡單地合並您的查詢開始-即使有很大的優化空間。
查詢1和7什么都不做-所以我們將使用它們的基表-其余的我們保持原樣。
SELECT
`plant`.`plant_id`,
IFNULL(`qry2A`.`plant_hrs_stop`,''),
IFNULL(`qry2B`.`total_hrs`,''),
IFNULL(`qry3`.`plant_error_report`,''),
IFNULL(`qry4`.`plant_service_next`,''),
IFNULL(`qry5`.`plant_status_ddl_id`,''),
IFNULL(`qry6`.`total_d`,''),
IFNULL(`plant_location`.`location_id`'')
FROM
-- Query 1: Use table
`plant`
-- Query 2A: Use as-is, but with the plant_id field and without the ORDER BY
LEFT JOIN (
SELECT `plant_hrs_stop`, s1.`plant_id` AS `plant_id`
FROM `plant_hrs` s1
WHERE `plant_hrs_date`=(SELECT MAX(s2.`plant_hrs_date`)
FROM `plant_hrs` s2
WHERE s1.`plant_id` = s2.`plant_id`)
) AS `qry2A` ON `plant`.`plant_id`=`qry2A`.`plant_id`
-- Query 2B: Use as-is, but with the plant_id field
LEFT JOIN (
SELECT (MAX(`plant_hrs_stop`)- MIN(`plant_hrs_start`) ) AS total_hrs, `plant_id`
FROM`plant_hrs`
WHERE MONTH(`plant_hrs_date`)= MONTH( CURRENT_DATE )
GROUP BY`plant_id`
) AS `qry2B` ON `plant`.`plant_id`=`qry2B`.`plant_id`
-- Query 3: Use as-is, but with the plant_id field and without the ORDER BY
LEFT JOIN (
SELECT `plant_error_report`,s1.`plant_id` AS `plant_id`
FROM `plant_error` s1
WHERE `plant_error_date`=(SELECT MAX(s2.`plant_error_date`)
FROM `plant_error` s2
WHERE s1.`plant_id` = s2.`plant_id`)
) AS `qry3` ON `plant`.`plant_id`=`qry3`.`plant_id`
-- Query 4: Use as-is, but with the plant_id field and without the ORDER BY
LEFT JOIN (
SELECT `plant_service_hrs` , `plant_service_next`,s1.`plant_id` AS `plant_id`
FROM `plant_service` s1
WHERE `plant_service_date`=(SELECT MAX(s2.`plant_service_date`)
FROM `plant_service` s2
WHERE s1.`plant_id` = s2.`plant_id`)
) AS `qry4` ON `plant`.`plant_id`=`qry4`.`plant_id`
-- Query 5: Use as-is, but with the plant_id field
LEFT JOIN (
SELECT `plant_status_ddl_id`,`plant_id`
FROM `plant_status`
WHERE `plant_status_date` = ( CURRENT_DATE ) - 1
GROUP BY `plant_id
) AS `qry5` ON `plant`.`plant_id`=`qry5`.`plant_id`
-- Query 6: Use as-is, but with the plant_id field
LEFT JOIN (
SELECT (SUM(`diesel_qty`) ) AS total_d, `diesel_vehicle_no` AS `plant_id`
FROM`diesel`
WHERE MONTH(`diesel_date`)= MONTH( CURRENT_DATE )
GROUP BY `diesel_vehicle_no`
) AS `qry6` ON `plant`.`plant_id`=`qry6`.`plant_id`
-- Query 7: Use table
LEFT JOIN `plant_location` ON `plant`.`plant_id`=`plant_location`.`plant_id`
ORDER BY
`plant`.`plant_id`
編輯 :使用@@ LuisSiquot建議使用LEFT代替INNER聯接
編輯 :在注釋請求后添加了IFNULL()
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