Given a set of data with date_created stored like 2017-04-13 23:29:52, how would I construct an SQL query to select all items that were created within the last 3 hours?
I originally thought to do something like this:
SELECT
*,
MAX(date_created)
FROM items
GROUP BY date_created
but that would not be exactly what I want. I'm not sure how to go about this.
Use NOW() and INTERVAL in your WHERE clause
SELECT * FROM items WHERE date_created <= NOW() - INTERVAL 180 minute AND date_created >= NOW() - INTERVAL 210 minute
This one uses CURDATE, CURDATE and DATE_ADD:
SELECT *
FROM items
WHERE DATE(date_created) = CURDATE()
AND TIME(date_created) BETWEEN CURTIME() AND DATE_ADD(CURTIME(), INTERVAL -3 HOUR)
select * from items where
extract(hours from age(current_timestamp, date_created))>=3;
Extract keyword would extract hours difference from current timestamp and return only that is greater than or equal to 3.
Related
I am trying to count the rows in a table in my database that were inserted within X hours or X days. I have tried repeatedly but I keep getting empty set responses.
The start_stamp column in my table is formatted like this: 2013-08-07 18:18:37
I have tried many variations on:
select * from mytable where start_stamp = now() interval -1 day;
But all to no avail. Can someone tell me what I am doing wrong?
Rather than selecting rows where start_stamp is equal to now() - 1day, you need rows where it is greater than or equal to that range. Additionally, your syntax is a little off. MySQL's date arithmetic uses column_value - INTERVAL <number> <period>, so you need:
SELECT COUNT(*) AS num_new_rows
FROM mytable
WHERE start_stamp >= NOW() - INTERVAL 1 DAY
Likewise to get n hours ago, use INTERVAL n HOUR
# Within 3 hours...
WHERE start_stamp >= NOW() - INTERVAL 3 HOUR
The syntax for date interval arithmetic is described in a small paragraph beneath the DATE_ADD() function reference in the official MySQL documentation.
Here are a some examples...
All entries within the past 6 hours:
select * from mytable where start_stamp >= now() - interval 6 hour;
All entries within the past 2 days:
select * from mytable where start_stamp >= now() - interval 2 day;
All entries within the past 2 1/2 days:
select * from mytable where start_stamp >= now() - interval 2 day - interval 12 hour;
I want to fetch data of last 1 hour from mySQL database. I can certainly do it in java after results have been fetched but i don't want to unnecessarily put load on application. Please help.
select * from tb_data
where createdtime > ADDDATE(NOW(), INTERVAL -1 HOUR)
If the column is of type DATE you can use the DATE_SUB function, which substracts a given time interval from a DATE.
SELECT * FROM [table] WHERE [date_column] > DATE_SUB(NOW(), INTERVAL 1 HOUR)
Documentation
select * from yourtable where created_at between NOW() and date_sub(NOW() , interval 1 HOUR)
I would like to rows that have only been entered in the last 1 day.
I have a date column which stores YYYY-MM-DD, and I allow the user to send a date that they want to look at in this format yyymmdd how can I use this data to limit it to the previous day only?
I would imagine it is something to do with the BETWEEN keyword but I cant figure it out.
SELECT * from TABLE_NAME WHERE ROW_DATE BETWEEN '2011-03-20' AND '2011-03-21'
This query:
SELECT *
FROM mytable
WHERE mydate >= STR_TO_DATE('110321', '%y%m%d') - INTERVAL 1 DAY
AND mydate < STR_TO_DATE('110321', '%y%m%d')
will return all records for Mar 20, 2011
From the MySQL manual (here):
SELECT something FROM tbl_name WHERE DATE_SUB(CURDATE(), INTERVAL 1 DAY) <= date_col;
SELECT * FROM YourTable WHERE date_column = DATE_ADD(CURDATE(), INTERVAL -1 DAY)
This returns all rows for today and yesterday.
I am storing rows with MySQL using a date col. Everytime I insert a new row I use date=CURDATE() .
Is there anyway I can run a SELECT statement that selects all rows that were created within the last 24 hours?
Joel
Try this:
SELECT * FROM table WHERE date >= DATE_SUB(NOW(), INTERVAL 24 HOUR))
You can use the sub_date() function with interval to make a range of dates between now and 24 hours ago:
SELECT * FROM
table WHERE
date_field BETWEEN curdate() AND DATE_SUB(curdate(), INTERVAL 1 DAY);
I always have trouble with complicated SQL queries.
This is what I have
$query = '
SELECT id,
name,
info,
date_time
FROM acms_events
WHERE date_time = DATE_SUB(NOW(), INTERVAL 1 HOUR)
AND active = 1
ORDER BY date_time ASC
LIMIT 6
';
I want to get up to 6 rows that are upcoming within the hour. Is my query wrong? It does not seem to get events that are upcoming within the next hour when I test it.
What is the correct syntax for this?
I'm going to postulate that you're looking at a group of records that contain a range of DATETIME values, so you probably want something more like this:
SELECT id,
name,
info,
date_time
FROM acms_events
WHERE date_time < DATE_ADD(NOW(), INTERVAL 1 HOUR)
AND date_time >= NOW()
AND active = 1
ORDER BY date_time ASC
LIMIT 6
Otherwise, your query is looking for records with a date_time of exactly "now + 1 hour". I'm assuming all your dates aren't specific to that particular second. ;)
To clarify a bit, DATE_ADD() and DATE_SUB() return exact timestamps, so your query above roughly translates to something like SELECT ... WHERE date_time = '2010-04-14 23:10:05' ORDER BY ..., which I don't think is what you want.
WHERE date_time = DATE_SUB(NOW(), INTERVAL 1 HOUR)
means date_time equals exactly now minus one hour, which would result in any record exactly one hour old.
Why not use
WHERE TIMEDIFF(date_time, NOW()) < '01:00:00'
AND date_time > NOW()