MySql查詢（大腦挑戰）

Question

列出在過去三個月（90天）內完成三項或更多維修工作的所有飛機。此外，列出所有飛機註冊號，飛機類型和製造商。

飛行員表：

reg_nbr, plane_type, manufacturer, resident, date_service 
'101', 'SE Prop', 'Lear', '1', '1998-12-01' 
'202', 'DE Prop', 'Cessna', '1', '1999-11-22' 
'303', 'SE Jet', 'Bombardier', '1', '2000-07-06' 
'404', 'ME Jet', 'Lear', '1', '2001-02-24' 
'505', 'SE Prop', 'Cessna', '0', '2003-12-01' 
'606', 'DE Prop', 'Bombardier', '1', '2004-11-22' 
'707', 'SE Jet', 'Lear', '1', '2005-07-06' 
'808', 'ME Jet', 'Cessna', '0', '2005-02-24' 
'909', 'SE Prop', 'Bombardier', '1', '2002-02-12' 

服務表：

workorder_nbr, file_nbr, reg_nbr, date_start, date_end, work_description, hours_worked, person_nbr 
'2061', '3101', '101', '2014-03-16', '2014-03-16', 'Maint', '2', '901' 
'2062', '3101', '101', '2014-07-20', '2014-07-21', 'Maint', '3', '901' 
'2063', '3102', '202', '2015-12-22', '2015-12-22', 'Replace', '5', '901' 
'2064', '3102', '202', '2015-07-12', '2015-07-13', 'Clean', '2', '901' 
'2065', '3103', '303', '2015-05-01', '2015-05-01', 'Maint', '2', '901' 
'2066', '3104', '404', '2015-07-09', '2015-07-09', 'Clean', '5', '901' 
'2067', '3108', '505', '2015-07-09', '2015-07-09', 'Maint', '2', '901' 
'2068', '3106', '606', '2015-08-21', '2015-08-21', 'Check', '1', '901' 
'2069', '3101', '101', '2016-01-15', '2016-01-16', 'Maint', '3', '901' 
'2070', '3101', '101', '2016-01-31', '2016-01-31', 'Repair', '15', '901' 
'2071', '3101', '101', '2016-02-08', '2016-02-10', 'Repair', '8', '901' 
'2072', '3108', '505', '2016-01-08', '2016-01-09', 'Upgrade', '20', '901' 
'2073', '3108', '505', '2016-02-02', '2016-02-02', 'Repair', '1', '901' 
'2074', '3108', '505', '2014-02-11', '2014-02-11', 'Maint', '1', '901' 

我的查詢：（它反正錯）

SELECT service.reg_nbr, plane_type, manufacturer 
FROM service, aircraft 
WHERE date_start BETWEEN (date(NOW() AND 90DAY) 
GROUP BY service.reg_nbr 
HAVING COUNT(service.reg_nbr) >=3 

我掙扎在WHERE化酶是如何使它根據問題的要求顯示當前日期至90天）

Answer 1

一種選擇是使用INTERVAL：

WHERE date_start BETWEEN CURDATE() - INTERVAL 90 DAY AND CURDATE() 

下面是完整的查詢：

SELECT s.reg_nbr 
FROM aircraft a 
INNER JOIN service s 
    ON a.reg_nbr = s.reg_nbr 
WHERE date_start BETWEEN CURDATE() - INTERVAL 90 DAY AND CURDATE() 
GROUP BY s.reg_nbr 
HAVING COUNT(*) >= 3 

Answer 2

你應該使用DATE_ADD功能：

SELECT service.reg_nbr, plane_type, manufacturer 
FROM service, aircraft 
WHERE date_start BETWEEN date(NOW()) AND DATE_ADD(NOW(), INTERVAL -90 DAY) 

參考：https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_date-add