For example, if i have search string "2017-12-14" then i need to find all rows that matches 7-day range: "%-12-11", "%-12-12", "%-12-13", "%-12-14", "%-12-15", "%-12-16", "%-12-17".
Is it possible to do with MySql only?
To select same day cross years you can use following trick.
get the list of last 7 days/1 week NOW() - INTERVAL 1 WEEK
get the DAYOFYEAR of that days
search the database for all values of the same day in year
.
SELECT * FROM timevalues
WHERE DAYOFYEAR(timefield) IN (
SELECT DAYOFYEAR(timefield)
FROM timevalues
WHERE DATE(timefield) BETWEEN NOW() - INTERVAL 1 WEEK AND NOW()
)
;
Note: Leap year is not taken into calculation!
According to my brief investigation according to the leap year it would be easier to extend the SQL query with tolerance of 1 day, ie to use - INTERVAL 8 DAY instead of 7 and then control the validity of the day outside the database during processing the data in a loop.
Yes, it is possible.
The function you are looking for is +/- INTERVAL expr unit. See MySQL Date and Time Functions
So to get 7 days back use - INTERVAL 7 DAY:
SELECT *
FROM tablename
WHERE DATE(timefield) BETWEEN '2017-12-14' - INTERVAL 7 DAY AND '2017-12-14'
According to your example would be enough to use -INTERVAL 1 WEEK:
SELECT *
FROM tablename
WHERE DATE(timefield) BETWEEN '2017-12-14' - INTERVAL 1 WEEK AND '2017-12-14'
And List of all possible units
MICROSECOND SECOND MINUTE HOUR DAY WEEK MONTH QUARTER YEAR
SECOND_MICROSECOND MINUTE_MICROSECOND MINUTE_SECOND HOUR_MICROSECOND
HOUR_SECOND HOUR_MINUTE DAY_MICROSECOND DAY_SECOND DAY_MINUTE DAY_HOUR
YEAR_MONTH
Related
I try select data from MySQL for this / last and next calendar month. There are couple of similar posts but none of them address January vs last or December vs next. I know I could do it in PHP around SQL but maybe someone have nice and clean way to address in in SQL. I tried with MOD () but this brings the problem of years. i.e. previous calendar month to avoid 0 in January
SELECT * FROM tbl_reservations WHERE ( (MONTH(tbl_reservations.start) = MOD((MONTH(NOW()) +11 ), 12)) AND ( YEAR(tbl_reservations.start) = YEAR(NOW()) ) )
Any ideas? Thanks.
I think it is pretty easy. For the last calendar month:
where extract(year_month from r.start) = extract(year_month from now() - interval 1 month)
You would can use similar logic for next month.
The above is not index friendly. The index friendly version is more cumbersome:
where r.start < curdate() - interval (1 - day(curdate())) day and
r.start >= (curdate() - interval (1 - day(curdate())) day) + interval 1 month
This gets the first day of the month by subtracting (1 - day(curdate())) days. Date manipulations and comparisons are then used to get dates for the last month.
Looking for some help regarding mysql date functions.
I am looking to show data for a time period of today to 8 days ago (I have been using this line of code in mysql WHERE TIME > CURDATE() - INTERVAL 8 DAY ) ) as well as the above time period but one year ago.
Try using
DATE_SUB with TIMESTAMPDIFF,
TIMESTAMP syntax,
TIMESTAMPDIFF(unit, datetime_expr1, datetime_expr2);
DATE_SUB syntax,
DATE_SUB(date, INTERVAL value unit);
Example,
SELECT TIMESTAMPDIFF(SECOND, DATE_SUB('2018-06-04 22:59:00', INTERVAL 10 DAY),
'2018-06-04 22:59:00');
I'm trying to get all rows from DATE column
values from 10 days ago till today
i'm trying to undesrtand why this syntax isn't working:
select * from table WHERE date BETWEEN NOW() AND NOW() - INTERVAL 10 DAY ORDER BY date
You have to start with the lower value when using between
select *
from table
WHERE date BETWEEN NOW() - INTERVAL 10 DAY and NOW()
ORDER BY date
The problem is not related to the NOW() function but to the BETWEEN operator, the lower timestamp has to be specified first:
where date between now() - interval 10 day and now()
however, depending on your requirements, you might want to use this:
where date between current_date() - interval 10 day and current_date()
or just
where date>=current_date() - interval 10 day
now() returns a timestamp that contains date and time information, while current_date() returns just the current date without time information. If date is just a date column, without time information, using now() - interval 10 day you will get just the latest 9 days and not the latest 10 as you might expect.
This query is selecting rows applied last 30 days:
SELECT `amount` FROM `mg_inputs` WHERE `amount`<0 AND `product`='144' AND DATE(firstedit) BETWEEN CURDATE() - INTERVAL 30 DAY AND CURDATE()
How about queries selecting rows applied last 30 days, but 1 month ago (between: today-30days and today-60days)? Same question goes for "2 months ago". Nothing is working for me at all (SQL is returning errors).
One important thing to note here is that not all months are 30 days, so instead of using INTERVAL DAY use INTERVAL MONTH.
Next, you don't need to use the subtraction sign for dates, you can use the DATE_SUB() function which will do what you need.
Last, keeping those things in mind, you can use the BETWEEN operator to check for rows within a date range. So, for example, if you want all rows from one month ago, try this:
SELECT *
FROM myTable
WHERE dateColumn BETWEEN DATE_SUB(CURDATE(), INTERVAL 2 MONTH) AND DATE_SUB(CURDATE(), INTERVAL 1 MONTH);
You should note that for the BETWEEN operator to work properly, the older date must appear first. Here is an SQL Fiddle example that demonstrates that.
Why this query is not working
SELECT * FROM history WHERE DATE(date) < CURDATE() + 30
I am trying to get the data from 30 days but my query is not working.Why
What does +30 mean? Days? Years? Months? Hours? You need to use (the proper syntax) a format MySQL understands:
SELECT * FROM history WHERE DATE(date) < CURDATE() + INTERVAL 30 DAY
To get the data from today on to 30 days after current day, you've got to set an upper and an lower limit, so use:
SELECT * FROM history WHERE
date >= CURDATE()
AND
date < CURDATE() + INTERVAL 31 DAY
Please note that by not using a function on your date column you won't prohibit MySQL to use an index on this column.
The lower limit should be obvious, the upper limit means that you've got the complete day that's 30 days later than today. If you use + INTERVAL 30 DAY instead this last day is excluded from the result.
Because you're not using the right construct, try:
SELECT * FROM history WHERE DATE_ADD(date, INTERVAL 30 DAY);