使用子查询统计“国内长线游”线路数、线路最高价格和线路最低价格

简介: 使用子查询统计“国内长线游”线路数、线路最高价格和线路最低价格

需求说明:


使用子查询统计“国内长线游”线路数、线路最高价格和线路最低价格

使用子查询获得指定客户(如“魏国兰”)订购线路的相关信息,要求显示订单名和订单日期

说明:客户姓名“魏国兰”没有重名


实现思路:


需求说明(1)的解决思路:


  • 单行子查询:从线路类型表获取类型名为“国内长线游”的类型编号
  • 主查询:使用聚合函数从线路表获取线路统计信息,将子查询所获取的类型编号作为主查询的条件比较值

需求说明(2)的解决思路:


  • 单行子查询:从客户表获取姓名为“魏国兰”的客户编号
  • 主查询:将子查询所获取的客户编号作为主查询的条件比较值,从订单表获取满足条件的订单编号和订单日期


实现代码:


使用子查询统计“国内长线游”线路数、线路最高价格和线路最低价格

SELECT COUNT(lineID) 线路数,MAX(price) 线路最高价(元),MIN(price) 线路最低价(元)
FROM line WHERE lineTypeID=(SELECT lineTypeID FROM linetype WHERE typeName='国内长线游');



使用子查询获得指定客户(如“魏国兰”)订购线路的相关信息,要求显示订单名和订单日期


SELECT ordersID 订单编号 ,ordersDate 订单日期 FROM orders WHERE customerID=
(SELECT customerID FROM customer WHERE NAME='魏国兰');


数据库:


/*
Navicat MySQL Data Transfer
Source Server         : mysql-1
Source Server Version : 50624
Source Host           : localhost:3306
Source Database       : journey
Target Server Type    : MYSQL
Target Server Version : 50624
File Encoding         : 65001
Date: 2019-01-26 11:19:38
*/
SET FOREIGN_KEY_CHECKS=0;
-- ----------------------------
-- Table structure for `customer`
-- ----------------------------
DROP TABLE IF EXISTS `customer`;
CREATE TABLE `customer` (
  `customerID` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(50) NOT NULL,
  `gender` varchar(50) DEFAULT NULL,
  `identityID` varchar(18) DEFAULT NULL,
  `tel` varchar(18) DEFAULT NULL,
  PRIMARY KEY (`customerID`)
) ENGINE=InnoDB AUTO_INCREMENT=6 DEFAULT CHARSET=utf8;
-- ----------------------------
-- Records of customer
-- ----------------------------
INSERT INTO `customer` VALUES ('1', '魏国兰', '女', '420103198309125344', '13923561234');
INSERT INTO `customer` VALUES ('2', '刘亚蒙', '男', '420105197610200916', '13867893421');
INSERT INTO `customer` VALUES ('3', '郝琼琼', '女', '420104198703125881', '15902712563');
INSERT INTO `customer` VALUES ('4', '雷亚波', '男', '420103199806195830', '13686035678');
INSERT INTO `customer` VALUES ('5', '李慧娟', '女', '420106199208113738', '13798235671');
-- ----------------------------
-- Table structure for `line`
-- ----------------------------
DROP TABLE IF EXISTS `line`;
CREATE TABLE `line` (
  `lineID` int(11) NOT NULL AUTO_INCREMENT,
  `lineTypeID` int(11) DEFAULT NULL,
  `lineName` varchar(50) NOT NULL,
  `days` int(11) DEFAULT NULL,
  `price` decimal(10,2) DEFAULT NULL,
  `vehicle` char(10) DEFAULT NULL,
  `hotel` char(10) DEFAULT NULL,
  `hasMeal` char(2) DEFAULT NULL,
  PRIMARY KEY (`lineID`)
) ENGINE=InnoDB AUTO_INCREMENT=22 DEFAULT CHARSET=utf8;
-- ----------------------------
-- Records of line
-- ----------------------------
INSERT INTO `line` VALUES ('1', '1', '黄陂木兰天池', '1', '159.00', '大巴', '无', '无');
INSERT INTO `line` VALUES ('2', '1', '大别山天堂寨', '2', '429.00', '大巴', '二星级', '无');
INSERT INTO `line` VALUES ('5', '1', '恩施大峡谷', '4', '1089.00', '火车卧铺', '二星级', '无');
INSERT INTO `line` VALUES ('6', '1', '庐山', '2', '729.00', '大巴', '二星级', '含');
INSERT INTO `line` VALUES ('7', '1', '凤凰古城', '3', '959.00', '火车卧铺', '二星级', '含');
INSERT INTO `line` VALUES ('8', '1', '黄山', '3', '1099.00', '动车', '三星级', '含');
INSERT INTO `line` VALUES ('9', '2', '海南岛三亚', '5', '3868.00', '飞机', '三星级', '含');
INSERT INTO `line` VALUES ('10', '2', '青岛蓬莱', '4', '2680.00', '飞机', '三星级', '含');
INSERT INTO `line` VALUES ('12', '2', '桂林', '5', '1920.00', '火车卧铺', '二星级', '无');
INSERT INTO `line` VALUES ('13', '2', '华东五市', '6', '2856.00', '动车', '三星级', '含');
INSERT INTO `line` VALUES ('14', '2', '成都九寨沟', '7', '4500.00', '飞机', '三星级', '含');
INSERT INTO `line` VALUES ('15', '2', '西安', '4', '2180.00', '动车', '三星级', '无');
INSERT INTO `line` VALUES ('16', '3', '欧洲德法意瑞', '13', '12294.91', '飞机', '四星级', '含');
INSERT INTO `line` VALUES ('17', '3', '日本东京富士山', '6', '7119.09', '飞机', '三星级', '含');
INSERT INTO `line` VALUES ('18', '3', '新马泰', '8', '6058.80', '飞机', '三星级', '含');
INSERT INTO `line` VALUES ('19', '3', '美国夏威夷', '6', '11493.90', '飞机', '四星级', '无');
INSERT INTO `line` VALUES ('20', null, '梁子湖游', '1', '168.00', '大巴', '无', '无');
INSERT INTO `line` VALUES ('21', null, '洪湖游', '1', '128.00', '大巴', '无', '无');
-- ----------------------------
-- Table structure for `linetype`
-- ----------------------------
DROP TABLE IF EXISTS `linetype`;
CREATE TABLE `linetype` (
  `lineTypeID` int(11) NOT NULL AUTO_INCREMENT,
  `typeName` varchar(50) DEFAULT NULL,
  PRIMARY KEY (`lineTypeID`)
) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=utf8;
-- ----------------------------
-- Records of linetype
-- ----------------------------
INSERT INTO `linetype` VALUES ('1', '国内短线游');
INSERT INTO `linetype` VALUES ('2', '国内长线游');
INSERT INTO `linetype` VALUES ('3', '出境游');
-- ----------------------------
-- Table structure for `oc_detail`
-- ----------------------------
DROP TABLE IF EXISTS `oc_detail`;
CREATE TABLE `oc_detail` (
  `travelCustomerID` int(11) NOT NULL,
  `ordersID` int(11) NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
-- ----------------------------
-- Records of oc_detail
-- ----------------------------
INSERT INTO `oc_detail` VALUES ('1', '1');
INSERT INTO `oc_detail` VALUES ('1', '2');
INSERT INTO `oc_detail` VALUES ('2', '3');
INSERT INTO `oc_detail` VALUES ('2', '5');
INSERT INTO `oc_detail` VALUES ('2', '7');
INSERT INTO `oc_detail` VALUES ('3', '3');
INSERT INTO `oc_detail` VALUES ('3', '4');
INSERT INTO `oc_detail` VALUES ('3', '7');
INSERT INTO `oc_detail` VALUES ('4', '3');
INSERT INTO `oc_detail` VALUES ('4', '5');
INSERT INTO `oc_detail` VALUES ('4', '8');
INSERT INTO `oc_detail` VALUES ('4', '9');
INSERT INTO `oc_detail` VALUES ('5', '1');
INSERT INTO `oc_detail` VALUES ('5', '6');
-- ----------------------------
-- Table structure for `ol_detail`
-- ----------------------------
DROP TABLE IF EXISTS `ol_detail`;
CREATE TABLE `ol_detail` (
  `ordersID` int(11) NOT NULL,
  `lineID` int(11) NOT NULL,
  `travelDate` date DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
-- ----------------------------
-- Records of ol_detail
-- ----------------------------
INSERT INTO `ol_detail` VALUES ('1', '2', '2018-10-27');
INSERT INTO `ol_detail` VALUES ('2', '5', '2018-01-20');
INSERT INTO `ol_detail` VALUES ('2', '7', '2018-02-01');
INSERT INTO `ol_detail` VALUES ('3', '1', '2018-06-26');
INSERT INTO `ol_detail` VALUES ('3', '6', '2018-07-05');
INSERT INTO `ol_detail` VALUES ('4', '13', '2018-08-29');
INSERT INTO `ol_detail` VALUES ('5', '1', '2018-10-16');
INSERT INTO `ol_detail` VALUES ('5', '14', '2018-10-21');
INSERT INTO `ol_detail` VALUES ('6', '18', '2018-07-10');
INSERT INTO `ol_detail` VALUES ('7', '15', '2018-10-19');
INSERT INTO `ol_detail` VALUES ('8', '19', '2018-11-27');
INSERT INTO `ol_detail` VALUES ('9', '7', '2018-12-28');
-- ----------------------------
-- Table structure for `orders`
-- ----------------------------
DROP TABLE IF EXISTS `orders`;
CREATE TABLE `orders` (
  `ordersID` int(11) NOT NULL AUTO_INCREMENT,
  `customerID` int(11) DEFAULT NULL,
  `ordersDate` date DEFAULT NULL,
  `amount` decimal(8,2) DEFAULT NULL,
  `man_times` int(11) DEFAULT NULL,
  `discount` decimal(8,2) DEFAULT NULL,
  `effectiveAmount` decimal(8,2) DEFAULT NULL,
  PRIMARY KEY (`ordersID`)
) ENGINE=InnoDB AUTO_INCREMENT=10 DEFAULT CHARSET=utf8;
-- ----------------------------
-- Records of orders
-- ----------------------------
INSERT INTO `orders` VALUES ('1', '1', '2018-10-20', '798.00', '2', '0.98', '782.04');
INSERT INTO `orders` VALUES ('2', '1', '2018-01-15', '1898.00', '2', '0.98', '1860.04');
INSERT INTO `orders` VALUES ('3', '2', '2018-06-18', '2574.00', '6', '0.96', '2471.04');
INSERT INTO `orders` VALUES ('4', '3', '2018-08-21', '2856.00', '1', '1.00', '2856.00');
INSERT INTO `orders` VALUES ('5', '4', '2018-10-10', '7698.00', '4', '0.96', '7390.08');
INSERT INTO `orders` VALUES ('6', '5', '2018-06-23', '6732.00', '1', '1.00', '6732.00');
INSERT INTO `orders` VALUES ('7', '3', '2018-10-11', '4360.00', '2', '0.98', '4272.80');
INSERT INTO `orders` VALUES ('8', '4', '2018-11-21', '12771.00', '1', '1.00', '12771.00');
INSERT INTO `orders` VALUES ('9', '4', '2013-12-20', '899.00', '1', '0.98', '881.02');
-- ----------------------------
-- View structure for `v_customer_orderline_detail`
-- ----------------------------
DROP VIEW IF EXISTS `v_customer_orderline_detail`;
CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`127.0.0.1` SQL SECURITY DEFINER VIEW `v_customer_orderline_detail` AS select `c`.`name` AS `客户名`,`l`.`lineName` AS `线路名`,`l`.`days` AS `行程天数`,`l`.`price` AS `价格` from (((`customer` `c` join `oc_detail` `ocd`) join `ol_detail` `old`) join `line` `l`) where ((`c`.`customerID` = `ocd`.`travelCustomerID`) and (`ocd`.`ordersID` = `old`.`ordersID`) and (`old`.`lineID` = `l`.`lineID`)) ;
-- ----------------------------
-- View structure for `v_customer_orders_detail`
-- ----------------------------
DROP VIEW IF EXISTS `v_customer_orders_detail`;
CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`127.0.0.1` SQL SECURITY DEFINER VIEW `v_customer_orders_detail` AS select `c`.`name` AS `name`,`l`.`lineName` AS `lineName`,`l`.`days` AS `days`,`l`.`price` AS `price` from (((`customer` `c` join `oc_detail` `ocd`) join `ol_detail` `old`) join `line` `l`) where ((`c`.`customerID` = `ocd`.`travelCustomerID`) and (`ocd`.`ordersID` = `old`.`ordersID`) and (`old`.`lineID` = `l`.`lineID`)) ;
-- ----------------------------
-- View structure for `v_nums_line`
-- ----------------------------
DROP VIEW IF EXISTS `v_nums_line`;
CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`127.0.0.1` SQL SECURITY DEFINER VIEW `v_nums_line` AS select `l`.`lineName` AS `线路`,count(`old`.`lineID`) AS `预订数` from (`line` `l` join `ol_detail` `old`) where (`l`.`lineID` = `old`.`lineID`) group by `l`.`lineName` ;
-- ----------------------------
-- Procedure structure for `proc_adjust_price`
-- ----------------------------
DROP PROCEDURE IF EXISTS `proc_adjust_price`;
DELIMITER ;;
CREATE DEFINER=`root`@`127.0.0.1` PROCEDURE `proc_adjust_price`(
    out oldPrice decimal,   -- 原价
    out newPrice decimal,   -- 现价
    out lineName_maxPrice varchar(50) -- 价格最高国内长线游线路名
)
    MODIFIES SQL DATA
begin
    declare lineID_maxPrice int; -- 价格最高国内长线游线路编号
    select max(price) into oldPrice from line where lineTypeID=
      (select lineTypeID from linetype where typeName='国内长线游');
    select lineID, lineName into lineID_maxPrice, lineName_maxPrice from line 
      where price=oldPrice and lineTypeID=(select lineTypeID from linetype where typeName='国内长线游');
    if oldPrice<3000 then
      set newPrice=oldPrice;
    elseif oldPrice>=3000 and oldPrice<4000 then
      set newPrice=oldPrice*0.95;
    elseif oldPrice>=4000 and oldPrice<5000 then
      set newPrice=oldPrice*0.93;
    else
      set newPrice=oldPrice*0.90;
    end if;
    if newPrice<>oldPrice then
      update line set price=newPrice where lineID=lineID_maxPrice;
    end if;
end
;;
DELIMITER ;
-- ----------------------------
-- Procedure structure for `proc_deleteLineType`
-- ----------------------------
DROP PROCEDURE IF EXISTS `proc_deleteLineType`;
DELIMITER ;;
CREATE DEFINER=`root`@`127.0.0.1` PROCEDURE `proc_deleteLineType`(
    _typeName varchar(20) -- 线路类型名称
)
    MODIFIES SQL DATA
begin
    declare state varchar(20);
    declare _lineTypeID int;   -- 线路类型编号
    -- 定义错误处理
    declare continue handler for sqlexception set state='error';
    select lineTypeID into _lineTypeID from LineType where typeName=_typeName;
    -- 开启事务
start transaction;
    -- 将线路中所需要删除的线路类型的编号置为NULL
    update line set lineTypeID=NULL where lineTypeID=_lineTypeID;
    if(state='error') then
      select '线路信息修改失败';
      rollback;
    else
      delete from LineType where typeName=_typeName;
      if(state='error') then
        select '线路类型删除失败';
        rollback;
      else
        select '线路类型删除成功';
        commit;
      end if;
    end if;
end
;;
DELIMITER ;
-- ----------------------------
-- Procedure structure for `proc_LineDetail`
-- ----------------------------
DROP PROCEDURE IF EXISTS `proc_LineDetail`;
DELIMITER ;;
CREATE DEFINER=`root`@`127.0.0.1` PROCEDURE `proc_LineDetail`(
    _lineName varchar(20)
)
    READS SQL DATA
begin
  select lineName 线路名, days 行程天数, price 价格, vehicle 交通工具, hotel 住宿标准 
  from line where lineName=_lineName;
end
;;
DELIMITER ;
-- ----------------------------
-- Procedure structure for `proc_LineNumsRate`
-- ----------------------------
DROP PROCEDURE IF EXISTS `proc_LineNumsRate`;
DELIMITER ;;
CREATE DEFINER=`root`@`127.0.0.1` PROCEDURE `proc_LineNumsRate`(
    _typeName varchar(20), 
    out numsRate decimal(10,3)
)
    READS SQL DATA
begin
    declare totalNum int; -- 定义全部线路数
declare num int;  -- 定义指定类型的线路数
    select count(*) into totalNum from line;
    select count(*) into num from line L, linetype LT where L.lineTypeID=LT.lineTypeID 
and LT.typeName=_typeName;
    -- 生成指定类型的线路数与全部线路数之比,赋给输出参数numsRate
    set numsRate=num*1.0/totalNum;
end
;;
DELIMITER ;
-- ----------------------------
-- Procedure structure for `proc_NumsGivenLineType`
-- ----------------------------
DROP PROCEDURE IF EXISTS `proc_NumsGivenLineType`;
DELIMITER ;;
CREATE DEFINER=`root`@`127.0.0.1` PROCEDURE `proc_NumsGivenLineType`(
    _typeName varchar(20),  
    out count int  -- 输出参数,用于输出指定线路类型的总预订数
)
    READS SQL DATA
begin
    select count(OLD.lineID) into count from ol_detail OLD, line L, lineType LT
    where OLD.lineID=L.lineID and L.lineTypeID=LT.lineTypeID and typeName=_typeName;
end
;;
DELIMITER ;
-- ----------------------------
-- Procedure structure for `proc_PriceModify`
-- ----------------------------
DROP PROCEDURE IF EXISTS `proc_PriceModify`;
DELIMITER ;;
CREATE DEFINER=`root`@`127.0.0.1` PROCEDURE `proc_PriceModify`()
    MODIFIES SQL DATA
begin
    declare _lineID int; 
    declare _days int; -- 线路旅程天数
    declare reduce_money decimal(10,2); -- 减免的住宿费
    declare state varchar(20); -- 错误状态
    declare line_cursor1 cursor for select lineID, days from line where hotel='二星级';
    declare continue handler for 1329 set state='error';
    open line_cursor1;
    traverse_line:while true do
      fetch line_cursor1 into _lineID, _days;     
      if(state='error') then
        leave traverse_line;
      end if;
      set reduce_money=(_days-1)*30;
      update line set price=price-reduce_money where lineID=_lineID;
    end while;
    close line_cursor1;
end
;;
DELIMITER ;


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