数据库查询查找特定日期两个站之间的火车，如irctc.co.in [英] database query to find trains between two stations on specific date like irctc.co.in

问题描述

我有以下数据库

CREATE TABLE IF NOT EXISTS `trains` (
    `id` mediumint(8) unsigned NOT NULL AUTO_INCREMENT,
    `train_no` varchar(5) COLLATE latin1_general_ci DEFAULT NULL,
    `train_name` varchar(50) COLLATE latin1_general_ci NOT NULL,
    `runsfrom` varchar(50) COLLATE latin1_general_ci NOT NULL,
    `SUN` varchar(3) COLLATE latin1_general_ci NOT NULL,
    `MON` varchar(3) COLLATE latin1_general_ci NOT NULL,
    `TUE` varchar(3) COLLATE latin1_general_ci NOT NULL,
    `WED` varchar(3) COLLATE latin1_general_ci NOT NULL,
    `THU` varchar(3) COLLATE latin1_general_ci NOT NULL,
    `FRI` varchar(3) COLLATE latin1_general_ci NOT NULL,
    `SAT` varchar(3) COLLATE latin1_general_ci NOT NULL,
    `DOE` date NOT NULL,
    PRIMARY KEY (`id`)
) ENGINE=MyISAM  DEFAULT CHARSET=latin1 COLLATE=latin1_general_ci AUTO_INCREMENT=1912 ;

具有如下数据：

INSERT INTO `trains` VALUES (269, '12307', 'HWH JU  EXPRESS', 'HOWRAH JN', 'MON', 'TUE', 'WED', 'THU', 'FRI', 'SAT', 'SUN', '2013-03-24');
INSERT INTO `trains` VALUES (270, '12308', 'JU HWH SUPFAST', 'JODHPUR JN', 'MON', 'TUE', 'WED', 'THU', 'FRI', 'SAT', 'SUN', '2013-03-24');
INSERT INTO `trains` VALUES (381, '12461', 'MANDOR EXPRESS', 'DELHI', 'MON', 'TUE', 'WED', 'THU', 'FRI', 'SAT', 'SUN', '2013-03-24');
INSERT INTO `trains` VALUES (382, '12462', 'MANDOR EXPRESS', 'JODHPUR JN', 'MON', 'TUE', 'WED', 'THU', 'FRI', 'SAT', 'SUN', '2013-03-24');

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表的表结构 train_number

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Table structure for table train_number

CREATE TABLE IF NOT EXISTS `train_number` (
    `id` int(11) NOT NULL AUTO_INCREMENT,
    `train_no` varchar(5) NOT NULL,
    PRIMARY KEY (`id`)
) ENGINE=InnoDB  DEFAULT CHARSET=latin1 AUTO_INCREMENT=1912 ;

具有如下数据：

INSERT INTO `train_number` VALUES (269, '12307');
INSERT INTO `train_number` VALUES (270, '12308');
INSERT INTO `train_number` VALUES (381, '12461');

表的表结构 train_schedule

Table structure for table train_schedule

CREATE TABLE IF NOT EXISTS `train_schedule` (
    `train_no` varchar(5) NOT NULL,
    `stn_code` varchar(20) NOT NULL,
    `stn_name` varchar(50) NOT NULL,
    `route_no` varchar(2) NOT NULL,
    `arr_time` varchar(5) NOT NULL,
    `dep_time` varchar(5) NOT NULL,
    `halt_time` varchar(5) NOT NULL,
    `distance` varchar(4) NOT NULL,
    `day` varchar(2) NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1;

具有如下数据：

INSERT INTO `train_schedule` VALUES ('12307', 'HWH ', 'HOWRAH JN      ', '1', 'Sourc', '23:30', '', '0', '1');
INSERT INTO `train_schedule` VALUES ('12307', 'BWN ', 'BARDDHAMAN JN  ', '1', '00:35', '00:37', '2:00', '95', '2');
INSERT INTO `train_schedule` VALUES ('12307', 'ASN ', 'ASANSOL JN     ', '1', '01:52', '01:56', '4:00', '200', '2');
INSERT INTO `train_schedule` VALUES ('12307', 'DHN ', 'DHANBAD JN     ', '1', '03:05', '03:15', '10:00', '259', '2');

现在我想找到两个车站之间的火车在特定日期。所以我尝试使用这个查询

Now I want to find to find the trains between two stations on specific date. So I tried with this query

SELECT distinct d1.train_no
FROM   train_schedule d1
INNER JOIN train_schedule d2 ON d2.train_no=d1.train_no
WHERE d1.stn_code = 'JU' and d2.stn_code = 'JP'

但它显示了从JU到JP和从JP到JU的数据，所以它使结果双重。

But it's showing both data from JU to JP and from JP to JU also so it makes the result double.

我想做这个查询在数据库中也给出

I want to make this query correct only for one direction on a specific date as days when it runs is also given in database

推荐答案

如果我正确理解你的问题，回答只返回一个方向的部分，请尝试以下查询：

If i understand your question correctly, to answer the part to return only one direction, please try the query below:

SELECT d1.*
FROM   train_schedule d1
INNER JOIN train_schedule d2 ON d2.train_no=d1.train_no
WHERE d1.stn_code = 'JU' and d2.stn_code = 'JP' 
   AND d1.distance < d2.distance

JU（离开）将始终具有小于JP（到达）的距离。

JU (departure) will always have distance less than JP (arrival).

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