我有以下数据库结构：
的MySQL＆GT; select * from scheduler;
+----+-------------------+-----------+-----------+-----------+---------+----------+ | id | name | daystart | hourstart | dayend | hourend | tariff | +----+-------------------+-----------+-----------+-----------+---------+----------+ | 6 | Monday morning | Monday | 00:00 | Monday | 06:00 | economic | | 8 | Monday night | Monday | 22:00 | Monday | 00:00 | economic | | 10 | Tuesday morning | Tuesday | 00:00 | Tuesday | 06:00 | economic | | 12 | Tuesday night | Tuesday | 22:00 | Tuesday | 00:00 | economic | | 14 | Wednesday morning | Wednesday | 00:00 | Wednesday | 06:00 | economic | | 16 | Wednesday night | Wednesday | 22:00 | Wednesday | 00:00 | economic | | 18 | Thursday morning | Thursday | 00:00 | Thursday | 06:00 | economic | | 20 | Thursday night | Thursday | 22:00 | Thursday | 00:00 | economic | | 22 | Friday morning | Friday | 00:00 | Friday | 06:00 | economic | | 24 | Friday night | Friday | 22:00 | Friday | 00:00 | economic | | 26 | Saturday | Saturday | 00:00 | Saturday | 00:00 | economic | | 28 | Saturday | Sunday | 00:00 | Sunday | 00:00 | economic | | 30 | Monday regular | Monday | 06:00 | Monday | 22:00 | regular | | 32 | Tuesday regular | Tuesday | 06:00 | Tuesday | 22:00 | regular | | 34 | Wednesday regular | Wednesday | 06:00 | Wednesday | 22:00 | regular | | 36 | Thursday regular | Thursday | 06:00 | Thursday | 22:00 | regular | | 38 | Friday regular | Friday | 06:00 | Friday | 22:00 | regular | +----+-------------------+-----------+-----------+-----------+---------+----------+ mysql> select * from rate_tariffs; +----+----------+----------+-------+----------+ | id | name | group_id | price | currency | +----+----------+----------+-------+----------+ | 2 | economic | 1 | 15.30 | UTT | | 4 | economic | 3 | 23.40 | UTT | | 6 | economic | 5 | 29.70 | UTT | | 8 | regular | 1 | 18.00 | UTT | | 10 | regular | 3 | 27.00 | UTT | | 12 | regular | 5 | 34.20 | UTT | | 14 | economic | 7 | 3.00 | UTT | | 16 | regular | 7 | 4.00 | UTT | +----+----------+----------+-------+----------+
这是什么：它是一个调度程序，应根据当前日期和时间选择要使用的资费。
我希望使用单个MySQL查询获取此信息。
到目前为止，我出于某种原因无法正常工作：
mysql> select scheduler.name, rate_tariffs.name, scheduler.id, rate_tariffs.id, CURTIME(), ( EXTRACT(HOUR_MINUTE FROm CURTIME()) - REPLACE(hourstart,':',"")) as diff , daystart, hourstart,dayend,hourend from rate_tariffs inner join scheduler on rate_tariffs.name=tariff where daystart=DATE_FORMAT(CURDATE(),'%W') and dayend=DATE_FORMAT(CURDATE(),'%W') and (EXTRACT(HOUR_MINUTE FROm CURTIME()) - REPLACE(hourstart,':',"")) >0 and ( REPLACE(hourend,':','') - EXTRACT(HOUR_MINUTE FROM CURTIME())) >0 and group_id=1; +------------------+----------+----+----+-----------+------+----------+-----------+----------+---------+ | name | name | id | id | CURTIME() | diff | daystart | hourstart | dayend | hourend | +------------------+----------+----+----+-----------+------+----------+-----------+----------+---------+ | Thursday morning | economic | 18 | 2 | 01:01:44 | 101 | Thursday | 00:00 | Thursday | 06:00 | +------------------+----------+----+----+-----------+------+----------+-----------+----------+---------+ 1 row in set (0.00 sec) mysql>
不幸的是，这一直不起作用。
例如，在星期三23:45:23时，它无法正常工作。一小时后，同样的查询正在运行（显示星期四）。
关于如何让这项工作变得更好（实际上让它发挥作用）的任何想法？ 您是否可以在单个SQL查询中执行此操作？ 你会以其他方式做到这一点吗？
PS：这是表信息：
INSERT INTO `scheduler` VALUES (6,'Monday morning','Monday','00:00','Monday','06:00','economic'),(8,'Monday night','Monday','22:00','Monday','00:00','economic'),(10,'Tuesday morning','Tuesday','00:00','Tuesday','06:00','economic'),(12,'Tuesday night','Tuesday','22:00','Tuesday','00:00','economic'),(14,'Wednesday morning','Wednesday','00:00','Wednesday','06:00','economic'),(16,'Wednesday night','Wednesday','22:00','Wednesday','00:00','economic'),(18,'Thursday morning','Thursday','00:00','Thursday','06:00','economic'),(20,'Thursday night','Thursday','22:00','Thursday','00:00','economic'),(22,'Friday morning','Friday','00:00','Friday','06:00','economic'),(24,'Friday night','Friday','22:00','Friday','00:00','economic'),(26,'Saturday','Saturday','00:00','Saturday','00:00','economic'),(28,'Saturday','Sunday','00:00','Sunday','00:00','economic'),(30,'Monday regular','Monday','06:00','Monday','22:00','regular'),(32,'Tuesday regular','Tuesday','06:00','Tuesday','22:00','regular'),(34,'Wednesday regular','Wednesday','06:00','Wednesday','22:00','regular'),(36,'Thursday regular','Thursday','06:00','Thursday','22:00','regular'),(38,'Friday regular','Friday','06:00','Friday','22:00','regular'); INSERT INTO `rate_tariffs` VALUES (2,'economic',1,'15.30','UTT'),(4,'economic',3,'23.40','UTT'),(6,'economic',5,'29.70','UTT'),(8,'regular',1,'18.00','UTT'),(10,'regular',3,'27.00','UTT'),(12,'regular',5,'34.20','UTT'),(14,'economic',7,'3.00','UTT'),(16,'regular',7,'4.00','UTT'); CREATE TABLE `scheduler` ( `id` int(3) NOT NULL AUTO_INCREMENT, `name` varchar(30) DEFAULT NULL, `daystart` varchar(15) DEFAULT NULL, `hourstart` varchar(6) DEFAULT NULL, `dayend` varchar(15) DEFAULT NULL, `hourend` varchar(6) DEFAULT NULL, `tariff` varchar(16) DEFAULT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB AUTO_INCREMENT=39 DEFAULT CHARSET=latin1; CREATE TABLE `rate_tariffs` ( `id` int(3) NOT NULL AUTO_INCREMENT, `name` varchar(25) DEFAULT NULL, `group_id` int(3) DEFAULT NULL, `price` varchar(10) DEFAULT NULL, `currency` varchar(10) DEFAULT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB AUTO_INCREMENT=17 DEFAULT CHARSET=latin1
谢谢， 丹
答案 0 :(得分：2)
一些意见和建议。这将使它运作。
在MySQL中使用本机类型可能更容易，尤其是日期和时间。因此，我建议将开始/结束时间更改为time字段。像这样：
ALTER TABLE `scheduler` CHANGE `hourstart` `hourstart` TIME NULL DEFAULT NULL;
ALTER TABLE `scheduler` CHANGE `hourend` `hourend` TIME NULL DEFAULT NULL;
接下来，调度员说小时开始于周四晚上10点（例如），并于周四凌晨12点结束。早上12点是早上，所以结束时间是在开始时间之前！因此，我们需要将结束时间更改为大于开始时间(23:59:59)。开始和结束时间也重叠一秒钟。让我们通过将结束时间减少1秒来使每个部分整齐地连接（但不重叠）。在午夜之前将任何无效时间设置为1秒。像这样：
UPDATE `scheduler` SET
hourend = SUBTIME(hourend, '00:00:01');
UPDATE `scheduler` SET
hourend = '23:59:59'
WHERE hourend < '00:00:00';
接下来，我们将调整SQL查询以使用我们的本机MySQL时间字段。唯一需要做的更改是底部的两个WHERE语句。我们希望它检查小时是否在开始和结束之间：
SELECT scheduler.name, rate_tariffs.name, scheduler.id, rate_tariffs.id, CURTIME(), ( EXTRACT(HOUR_MINUTE FROm CURTIME()) - REPLACE(hourstart,':',"")) as diff , daystart, hourstart,dayend,hourend from rate_tariffs
INNER JOIN scheduler on rate_tariffs.name=tariff
WHERE daystart = DATE_FORMAT(CURDATE(),'%W')
AND dayend = DATE_FORMAT(CURDATE(),'%W')
AND CURTIME() >= hourstart
AND CURTIME() <= hourend
AND group_id = 1;