I have a DateTime column in a MySQL table that I'm trying to filter just from the time of the DateTime. So for example I need all rows that the time is 8am-9am on any date. Is this possible? I've looked through all the docs and can't find anything of the sort.
Thanks guys!
Use the TIME function, like this
where TIME(myColumn) >= '08:00:00' and TIME(myColumn) <= '09:00:00'
TIME gets the time part of your value.
Related
I have a table which stores time data in the DATETIME format. I would like to build a query to return just the values after a give time (for example 15:00 - i.e. 3pm) for each day, not just for a given date.
Is this possible in MySQL. Does anyone have any examples?
You can use the hour() function:
where hour(col) >= 15
You can do this:
WHERE TIME(column) >= '15:00:00'
or even
WHERE TIME(a.column) >= TIME(b.cutoff)
I've got two columns (both datetime) startDate and endDate in an events table.
I am retrieving the current day using the the date() function of php.
This results in for example 2013-03-12.
Now there are three possibilities of events combined with dates that occur today:
An event starts and also end on this day
An event has started earlier and ends today
An event starts today but ends in the future (>= 2013-03-13)
Now I'd like to break these all into separate queries as I'm not used to work with dates. I started with the first query, but I am already failing on that one. I've tried the following:
SELECT * FROM events WHERE (startDate= '2013-03-12' AND endDate= '2013-03-12')
aswell as:
SELECT * FROM events WHERE NOT (startDate < '2013-03-12' OR endDate > '2013-03-12')
I've tried to use DATE() aswell and to format dates like '2013-03-12%'.
I don't know why it doesn't work while i am sure there is at least 1 event that is taking place on the 12th. Any help is appreciated.
Try using the MySQL's DATE() function to trim the date columns to the just the date parts:
SELECT *
FROM events
WHERE (DATE(startDate) = '2013-03-12' AND DATE(endDate)= '2013-03-12')
You can use the DATE() function as other answers suggested, but I think this makes it hard to use an index on the columns. Instead, you can include times in your comparisons:
SELECT *
FROM events
WHERE startDate BETWEEN '2013-03-12 00:00:00' AND '2013-03-12 23:59:59'
AND endDate BETWEEN '2013-03-12 00:00:00' AND '2013-03-12 23:59:59'
The DATETIME datatype in MySQL considers the time of the day as well, so, it will not match anything.
If you don't have any use of the time part, then you can simply reduce the datatype to DATE instead of DATETIME. If not, you can use the DATE() function to get rid of the time part and only consider the date part
NOTE THIS WHEN USING between on Mysql
date_column_name between 'startDate' AND 'endDate'
NOTE : you should want to insert +1 date to endDate . Because of when you insert 2015-05-18 date to endDate.you can not get data of 2015-05-18.So you need to plus one date to endDate.
first of all, I know that my question is very similar to that one:
MySQL select rows from exactly 7 days ago
the difference is that my dates are stored in the database as a timestamp.
I know that I can use FROM_UNIXTIME to get the date from the timestamp, the thing is, in another answer I read that was very resource consuming (because the timestamp field has to be converted to date in all the records before comparing).
DATE(from_unixtime(timestamp)) = CURRENT_DATE()
Is there any optimized way to do this?
Turn it around: calculate the unix timestamp of the target date first and use that.
WHERE timestamp = UNIX_TIMESTAMP(NOW() - INTERVAL 7 DAY)
MySQL should calculate that value once and use it all the time (needs testing though). If it doesn't, use a variable or code.
I would like to store in my table a full date: year, month, day, hour, minute.
Using the date type is limiting me to year month and day only.
What should I do? I have to mention that I will select records from the db order by the full date so storing the hour and minute seperatly as strings might be a problem right?
You may use DATETIME instead of DATE.
Took me a while to figure this out but to change it in MySQL you have to go to the column that you are looking to change in structure. Change the Type column from DATE to DATETIME.
I want to get the records from mysql data base based on time.
I have lastquery_date column in my table every time update the date and time in that column.
I want to get time difference with current date is less than 12 mins
How can i get this query..
Please help me
see the link below and develop your own logic :)
TIMEDIFF
Your question is not entirely clear, but I think this is what you want:
SELECT *
FROM your_table
WHERE lastquery_date >= NOW() - INTERVAL 12 MINUTE