我有一个带有日期列的 mysql 表。日期列数据类型为 TIMESTAMP,默认设置为 CURRENT_TIMESTAMP,同时记录日期和时间
现在我想计算给定日期下的行数
举个例子
++++++++++ 8am 9am 10am 11am
++user1+++ 15 10 11 10
++user2+++ 10 10 20 30
每个小时的计数应该像这样单独记录。
我尝试过这个,但它不起作用
SELECT COUNT(*) FROM mytable
WHERE `date` = '2015-01-26'
GROUP BY HOUR(`TIMESTAMP`)
我怎样才能实现这个目标?
我不知道如何与用户分组。 sproc也可以
我做了一个这样的存储过程。但这个存储过程包含错误。有人可以帮我吗,我想算一下相隔 9 个小时
DELIMITER $$
CREATE DEFINER=`root`@`localhost` PROCEDURE `test22`(IN datestamp DATE)
BEGIN
SELECT username,
COUNT(if(disblid,1,null)) '8:00 AM', where time between '08:00' and '09:00':
COUNT(if(disblid,1,null)) '9:00 AM' , where time between '09:00' and '10:00';
FROM claimloans
WHERE DATE(date) = datestamp
group by Username;
END
感谢所有帮助我的人,我想出了一个工作得非常好的存储过程。
DELIMITER $$
CREATE DEFINER=`root`@`localhost` PROCEDURE `claimscounter`(IN datestamp DATE)
BEGIN
SELECT username,
COUNT(IF(HOUR(date)=0,1,NULL)) AS '12am',
COUNT(IF(HOUR(date)=1,1,NULL)) AS '1am',
COUNT(IF(HOUR(date)=2,1,NULL)) AS '2am',
COUNT(IF(HOUR(date)=3,1,NULL)) AS '3am',
COUNT(IF(HOUR(date)=4,1,NULL)) AS '4am',
COUNT(IF(HOUR(date)=5,1,NULL)) AS '5am',
COUNT(IF(HOUR(date)=6,1,NULL)) AS '6am',
COUNT(IF(HOUR(date)=7,1,NULL)) AS '7am',
COUNT(IF(HOUR(date)=8,1,NULL)) AS '8am',
COUNT(IF(HOUR(date)=9,1,NULL)) AS '9am',
COUNT(IF(HOUR(date)=10,1,NULL)) AS '10am',
COUNT(IF(HOUR(date)=11,1,NULL)) AS '11am',
COUNT(IF(HOUR(date)=12,1,NULL)) AS '12pm',
COUNT(IF(HOUR(date)=13,1,NULL)) AS '1pm',
COUNT(IF(HOUR(date)=14,1,NULL)) AS '2pm',
COUNT(IF(HOUR(date)=15,1,NULL)) AS '3pm',
COUNT(IF(HOUR(date)=16,1,NULL)) AS '4pm',
COUNT(IF(HOUR(date)=17,1,NULL)) AS '5pm',
COUNT(IF(HOUR(date)=18,1,NULL)) AS '6pm',
COUNT(IF(HOUR(date)=19,1,NULL)) AS '7pm',
COUNT(IF(HOUR(date)=20,1,NULL)) AS '8pm',
COUNT(IF(HOUR(date)=21,1,NULL)) AS '9pm',
COUNT(IF(HOUR(date)=22,1,NULL)) AS '10pm',
COUNT(IF(HOUR(date)=23,1,NULL)) AS '11pm'
FROM claimloans
WHERE DATE(date) = datestamp
group by username;
END
但是现在我还有另一个小问题。这算所有的时间。如果一小时内没有进入,则算作零。我想计算只有记录的时间有人可以帮我吗
谢谢
最佳答案
我会将其作为 View 来解决,如下所示:
CREATE TABLE foo (id int not null, val timestamp);
CREATE VIEW foo_by_hours AS (
SELECT
id,
DATE(val) AS 'day',
COUNT(IF(HOUR(val)=0,1,NULL)) AS '12am',
COUNT(IF(HOUR(val)=1,1,NULL)) AS '1am',
COUNT(IF(HOUR(val)=2,1,NULL)) AS '2am',
COUNT(IF(HOUR(val)=3,1,NULL)) AS '3am',
...
FROM foo
GROUP BY id, day);
SELECT * FROM foo_by_hours;
SQL Fiddle 上的完整示例
我还添加了一个使用 SUM
而不是 COUNT
的 View 。结果是一样的,只是方法不同。
关于mysql - 给定日期每小时计算 mysql 行数,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/28482165/