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select version();
version()
5.7.29
CREATE TABLE `plt_distinct` ( `directory` varchar(10) NOT NULL DEFAULT '', `latitude` double NOT NULL DEFAULT '0', `longitude` double NOT NULL DEFAULT '0', `flag` int(11) DEFAULT NULL, `altitude` double NOT NULL DEFAULT '0', `passeddate` varchar(255) DEFAULT NULL, `gpsdate` date , `gpstime` time , `gpsdatetime` timestamp NULL DEFAULT NULL, PRIMARY KEY (`directory`,`latitude`,`longitude`,`gpsdate`,`gpstime`,`altitude`) )
CREATE TABLE `labels` ( `directory` varchar(10) NOT NULL DEFAULT '', `starttime` datetime , `endtime` datetime , `transportationmode` varchar(10) NOT NULL DEFAULT '', PRIMARY KEY (`directory`,`starttime`,`endtime`,`transportationmode`) )
INSERT INTO plt_distinct (directory, latitude, longitude, flag, altitude, passeddate,gpsdate, gpstime, gpsdatetime) VALUES (179, 40.91815, 111.709216666667, 0, 3825.4593175853, 39521.1235532407, '2008-11-29', '02:27:55', '2008-11-29 02:27:55'), (179, 40.91775, 111.71165, 0, 3937.00787401575, 39521.1354861111, '2008-11-29', '02:05:42', '2008-11-29 02:19:42'), (179, 40.9174666666667, 111.71165, 0, 3900.9186351706, 39521.1386805556, '2008-11-29', '02:15:06', '2008-11-29 03:15:06'), (179, 40.91735, 111.709533333333, 0, 3809.05511811024,39521.1245833333, '2008-11-17', '07:10:24', '2008-11-17 07:12:24'), (179, 40.9171333333333, 111.711683333333, 0, 3851.70603674541, 39521.1451273148, '2008-11-17', '07:01:59', '2008-11-17 07:05:59')
INSERT INTO labels (directory, starttime, endtime, transportationmode) VALUES (179, '2008-11-29 02:07:57', '2008-11-29 02:43:37', 'subway'), (179, '2008-11-29 02:01:39', '2008-11-29 02:07:57', 'walk'), (179, '2008-11-29 02:07:57', '2008-11-29 02:01:39', 'bus'), (179, '2008-11-17 07:06:16', '2008-11-17 07:14:32', 'walk'), (179, '2008-11-17 06:59:58', '2008-11-17 07:06:16', 'bus')
SELECT COUNT(*) FROM labels JOIN plt_distinct USING(directory ) WHERE transportationmode='bus';
COUNT(*)
10