I want to compare a datetime from sql and the todays date.
The datetime in sql is for example 2015/05/09 12:00:00 and the current date is 2015/05/09. I want to compare these things if they are equal, but for the whole day so the time is a problem. I have the following query.
$q1="SELECT reservations.reservation_id, reservations.room_id, room.room_rate, reservations.arrival_date, reservations.departure_date,
meals.meal_rate, room.room_rate, roomtype.max_persons,
CONCAT(clients.first_name,' ',clients.last_name)as name
FROM reservations, clients, meals, room, roomtype
WHERE reservations.room_id=room.room_id AND reservations.client_id=clients.client_id AND room.roomtype_id=roomtype.roomtype_id
AND reservations.meals=meals.meal_id AND reservations.arrival_date=CURDATE()
GROUP BY reservation_id
";
reservations.arrival_date=CURDATE() this is equal only at 12:00:00 o'clock. i want that to be equal for the whole day.Actually i want to compare if these two dates are equal without time but my database must be datetime with the time...
does anyone has an idea?
thanx in advance
You should learn to use standard join syntax. Simple rule: Never use commas in the from clause.
The answer to your question is either the date() function (or something similar):
where date(reservations.arrival_date) = CURDATE()
Or an inequality:
where (reservations.arrival_date >= CURDATE() and
reservations.arrival_date < date_add(CURDATE(), interval 1 day)
)
The second is actually preferred because it can make use of an index on reservations(arrival_date).
Related
I have a table called reports in MySQL(MariaDB) . There is a one(out of 5) column named logdate which is is of type datetime .columns stores the the date and time (in 24hr format) .
for ex here is sample value from that column
2021-04-10 09:35:00
I have to find all reports between a given date and time .
I get 4 variables from form data in PHP
$fromdate= $_POST['fromdate'];
$todate= $_POST['todate'];
$fromtime= $_POST['fromtime'];
$totime= $_POST['totime'];
$fromtime and $totime are just integers with value from 0-23 for hours.
For example the condition may be like get all data between 4th April 2021
from 5 o'clock To 8 April 2021 18 o'clock
i.e. From 2021-04-04 03:00:00 to 2021-04-08 18:00:00. There will be never condition on minutes and seconds .
My question is how to construct a datetime in PHP compatible with MySQL types so I can have good(efficient, there are millions of records in table ) search speed?
for ex
$select = "select * from reports where logdate between ? and ? ";
P.S: I tried saving date and time as integer as unixtime stamp. But when i convert from and to date received using strttotime() I facing time format issue due to bug in my code which so can use datetime only.
If you have any suggestion to improve efficiency of DB please suggest.Thanks
Hi this link may be of help in optimizing date comparison
MySQL SELECT WHERE datetime matches day (and not necessarily time)
This one below, will help you in formatting your strtotime() by using strptime()
https://www.php.net/manual/en/function.strptime.php
Also check your spelling or typo; you wrote "strttotime()" instead of "strtotime()" yours has an extra 't' in str"tto"time, it should be str"to"time, though without the double qoutes
Though I can't say for sure this is the most effective way but you can use hour(logdate) to compare with $fromdate and $todate
$select = "select * from reports where hour(logdate) between ? and ? ";
But it will only compare hour part. Please mention how you are getting date part to compare?
It is not a good idea to make a calculation on a field in the WHERE CLAUSE. In this case MySQL / MariaDB must calculate the value from this field to comapare it to see
if this ROW has this condition. So MySQL must read the whole table FULL TABLE SCAN and CANT use any INDEX.
A better way to do this is to store the calculation on fix site. Then MySQL calculated it only one time and can use a Index ( if there one) .
you can easy use a query like this:
$select = "SELECT * FROM reports where logdate between date(?) + INTERVAL ? HOUR AND date(?) + INTERVAL ? HOUR ";
to test see:
SELECT date('2021-04-05') + INTERVAL 16 HOUR;
result:
2021-04-05 16:00:00
Here is what is working for me after using Bernds solution .
I constructing datetime string in php
$fromstr ="$fromdate"." "."$fromtime".":00:00";
$tostr="$todate"." "."$totime".":00:00";
here is my query looks like for date of 7th April to 10th April
$ select = "SELECT * FROM reports where logdate >= '$fromstr' and logdate <= '$tostr' order by logdate";
after echoing it
"SELECT * FROM reports where logdate >= '2021-04-07 3:00:00' and logdate <= '2021-04-10 5:00:00' order by logdate";```
However I am not sure if can use index for logdate column and utilize it with above query.
I want to filter some items based on two different dates using MySQL. In my database I store data like 2017-03-28 10:55:10. But I need only the date part, not the time so I used the DATE() function:
select sum(cashamount) as sumcashsalesamount,
DATE(transactiondate) as datepart
from master_transaction
where transactiondate BETWEEN '2017-02-22%' AND '2017-03-28%'
order by transactiondate desc
Above this query have two dates 2017-02-22% and 2017-03-28% but this return no result.
But when I change this 2017-03-28% date to 2017-03-29% (tomorrow date) I get results.
Don't use between with "dates". I put that in quotes, because your values are really datetime values.
The best way to write this condition is:
where transactiondate >= '2017-02-22' and
transactiondate < '2017-03-29'
Note the inequality for the second condition. BETWEEN is inclusive, so it would include midnight on 2017-03-28.
Why is this best?
It allows the query optimizer to take advantage of indexes and partitions.
It is exactly the logic that you want.
It works for both date and datetime types.
BETWEEN is inclusive on both sides, and if no time component is given for a date, it defaults to 00:00:00. Since 2017-03-28 10:55:10 > 2017-03-28 00:00:00 it is not included in the result set.
2017-03-28% = 2017-03-28 00:00:00
If something happened during that day, you need 2017-03-28 23:59:59, or date_sub(2017-03-29, INTERVAL 1 second) for ease
You can only use wildcard characters (%) with LIKE.
Use:
where date(transactiondate) BETWEEN '2017-02-22' AND '2017-03-28'
if you use between and you want today, all day, you must put tomorrow date
And i fix my problem
select sum(cashamount) as sumcashsalesamount
from master_transaction
where DATE(transactiondate)BETWEEN '2017-02-22' AND '2017-03-28'
order by transactiondate desc
I just re-place the DATE(transactiondate) in where condition its worked
how to search between two date , when date format in database like :
2015-10-10 02:23:41 am
i just want to search between two date with format :
2015-10-10
without
02:23:41 am
any ideas please ?
Your question isn't completely clear. But, I guess you hope to find all the rows in your table where Date occurs on or after midnight on 2015-08-05 and before midnight on 2015-09-11 (the day after the end of the range you gave in your question.
Those two search criteria will find all the rows with Date values in the range you specified. (I'm ignoring the 02 at the end of 2015-09-10 02 in your question because I can't guess what it means, if anything.)
Try this query:
SELECT *
FROM table
WHERE `Date` >= '2015-08-05'
AND `Date` < '2015-09-10' + INTERVAL 1 DAY
This has the benefit that it can exploit an index on the Date column if you have one, so it can be fast.
You could write
SELECT *
FROM table /* slow! */
WHERE DATE(`Date`) BETWEEN '2015-08-05' AND '2015-09-10'
That's slightly easier to read, but the WHERE condition isn't sargable, so the query will be slower.
Notice that the beginning of the range uses >= -- on or after midnight, and the end of the range uses < -- before midnight.
Pro tip: Avoid the use of reserved words like DATE for column names. If you make mistakes writing your queries, their presence can really confuse MySQL, not to mention you, and slow you down.
May I suggest:
select * from table where cast(date as date) between '2015-08-05' and '2015-09-10'
When your where clause is based on a timestamp, but you're using date as the parameters for your between, it excludes anything that happens on the second date unless it happened precisely at midnight.
When using the end date for the range, include the time of the end of the day:
SELECT *
FROM YourTable
WHERE date BETWEEN '2015-08-05' AND '2015-09-10 23:59:59'
I am trying to abstract querying a month of data on the MySQL level without having to implement a series of conditions that determine the last day of a given month on a given year. LAST_DAY() seemed to be the answer but it appears to only return the date and not the provided time.
SELECT LAST_DAY('2011-02-05 23:59:59');
returns
2011-02-28
When I try to use it in a query, I lose all the entries from the last day of the month because without time the date value is not accepted.
SELECT * FROM subscriptions
WHERE (`modified_at` BETWEEN '2014-12-01 00:00:01' AND LAST_DAY('2014-12-01 23:59:59'));
How can I modify this query so that the LAST_DAY function either generates the last time of the day or preserves the time given?
How about changing the logic to ignore times?
SELECT *
FROM subscriptions
WHERE `modified_at` >= '2014-12-01' AND
`modified_at` < date_add('2014-12-01', interval 1 month)
And this doesn't need last_day().
Use ADDTIME(expr1,expr2);
Like this:
ADDTIME(LAST_DAY('2011-02-05 23:59:59'), '23:59:59')
Here is my table
I am executing a query that give me result of fields whose item_valid_from must be greater than today's date and item_valid_to must be less than today.
My query is
select *
from tbl1
where item_valid_from >= CurDate()
and item_valid_to < CurDate()
Any Solution?
I would advise you to change item_valid_* field formats to DATE field format. You will save you a lot of trouble in the future.
But ok, if you don't want to do that, then you can use STR_TO_DATE() function:
SELECT *
FROM `table`
WHERE CURDATE() BETWEEN STR_TO_DATE(`from_field`, '%d-%m-%Y') AND STR_TO_DATE(`to_field`, '%d-%m-%Y')
demo
Assuming the datatype item_valid_from and item_valid_to is DATE, TIMESTAMP, etc, then you have your operators backwards. Think of the time as seconds since 1970, since this is how it is stored in unix time. That means that item_valid_from is going to be smaller than item_valid_to, and you want it to display when today is somewhere between them. You want the item_valid_from to be less than or equal to now, and the item_valid_to to be greater than now (not in the past).
SELECT *
FROM tbl1
WHERE item_valid_from <= CURDATE() AND item_valid_to > CURDATE()
See this SQL Fiddle for an example, only 2-4 are valid and show up in the results being valid from a date in the past and expiring on a date in the future.
You have to use following query which change current date format then compare date and fetch result :
SELECT *
FROM tbl1
WHERE date_format(item_valid_from,'%d-%m-%Y') >= date_format(CurDate( ),'%d-%m-%Y')
AND date_format(item_valid_to,'%d-%m-%Y') < date_format(CurDate( ),'%d-%m-%Y')
Please Check this :http://sqlfiddle.com/#!2/561d0/2