I have a problem related to MySQL query, I use WAMPServer.
I have data in database which have range of dates but when I select data for example
select * from CHD WHERE addtime>='2018-06-15' and addtime<='2018-06-21';
It displays data from '2018-06-15' to '2018-06-20', data of 2018-06-21 are not displayed even if I do
select * from CHD where addtime='2018-06-21';
is not working
Please anyone can help me
This assumes that your column is of type datetime.
The shorthand version of your date in the filter clause is assumed to be at midnight of the date. Your values that you are attempting to retrieve have times after midnight of that date. You either need to define a timestamp along with the date, or you need to filter by the day after for less than equal to or the day before for greater than equal
Related
I need to select data from mysql for last 7 days. I have field named 'date' and which have values in mm.dd.yy format.
So i tried to find special mysql request to do that, but its not work with my field, i gues that beacause date in wrong format.
How i can do that from php (use some variable to get mysql entries), or with custom select query ?
You can use STR_TO_DATE() to convert your idiosyncratic date format to a standard DATE value. An expression like this will do the trick
STR_TO_DATE('07.17.97', '%m.%d.%y')
Then you can say
WHERE STR_TO_DATE(`date`, '%m.%d.%y') >= CURDATE() - INTERVAL 7 DAY
in your query to filter items with date values starting a week ago.
But, if you have a lot of rows to filter you will have poor performance: this kind of WHERE clause is not sargable.
First read your table and change the date format
$new_date_format = date('Ymd',mktime(0,0,0,substr($date,0,2),substr($date,3,2),substr($date,6,2)));
After that you can make comparisions
I have a PHP scirpt that is always querying all the data from a database table and it's getting pretty slow. I really just need the data of a specific month and year.
Is there a simple way to get only those entries? For example, everything from February 2013?
The column that stores the dates in my table is of type datetime, if that applies to the solution.
You can add that condition in the WHERE clause of your select statement. I would recommend using BETWEEN operand for two dates:
SELECT myColumns
FROM myTable
WHERE dateColumn BETWEEN '2013-02-01' AND '2013-02-28';
If you mean to say you want everything beginning with February 2013, you can do so using the greater than or equal to operator:
SELECT myColumns
FROM myTable
WHERE dateColumn >= '2013-02-01';
EDIT
While the above are my preferred methods, I would like to add for completeness that MySQL also offers functions for grabbing specific parts of a date. If you wanted to create a paramaterized query where you could pass in the month and year as integers (instead of a start and end date) you could adjust your query like this:
SELECT myColumns
FROM myTable
WHERE MONTH(dateColumn) = 2 AND YEAR(dateColumn) = 2013;
Here is a whole bunch of helpful date and time functions.
You should index the datetime field for added efficiency and then use Between syntax in your sql. This will allow the mysql engine to remove all records that you are not interested in from the returned data set.
I'm new to MySQL and PHP but was wondering if someone could help me with a little project I'm doing for my boss.
I have a SQL database (MyDB) and a table in there (mytable) with two columns - the first column (index) is an auto-incrementing integer from 1-10, the second column (date) has different dates and timestamps in the format of Year-month-day time 2013-04-12 1326
I'm trying to create a simple PHP page that first gets the current date (easy enough) then looks at the table and shows the number of rows that fall within yesterday's date. For example, if I have 3 rows with 2013-04-11 XXXX and 2 rows with 2013-04-12 XXXX (and today is the 12th April 2013) the page will display 3. (The time is not important but we can't remove it from the table as it's auto created by one of the other staff's programs and he refuses to change it).
So far I've got my php page, done a connection to the DB and defined two variables:
$startdate = date('Y'."-".'n'."-".'d'." "."0000");
$enddate = date('Y'."-".'n'."-".'d'." "."2359");
As the timestamp doesn't matter I've gone for the min/max possible on the variables. I realise this will only give the current date, trying to work out how to get it to display the previous day as the date in the variable.
Now I'm trying to create a sql query that will count the number of rows where the date field falls within the startdate and enddate variables (-1 day) but not too sure where to start or how this would look. I then need to output this as a variable in PHP so I can echo it later in the page.
Anyone able to point me in the right direction? Hope any of this makes sense.
You could write a query with no params to do this (if its always just yesterday).
SELECT * FROM <table>
WHERE DATE_FORMAT(<date column>,'%j-%Y') = DATE_FORMAT(DATE_SUB(now(),INTERVAL 1 DAY), '%j-%Y');
Date functions in the where clause might not be super awesome performance wise
I have two field in a database table departureDateTime and arrivalDateTime and the values like
departureDateTime=03/18/2012 1:05 PM
arrivalDateTime=03/18/2012 3:15 PM
I have hundreds of records in the table.
I need to sort and display according to the duration from these two time. I know to calculate the duration from two dates
Duration=(strtotime($arrivalDateTime') - strtotime($departureDateTime))/3600
But how I write a mysql query to sort and display these 100 records from database
Does any one any idea?
Thanks
Change your departureDateTime to DATETIME instead of varchar or whatever you are currently using. Then you would use something like this:
SELECT other, stuff, TIMEDIFF(departureDateTime, arrivalDateTime) as theDifference FROM myTable ORDER BY theDifference ASC LIMIT 0, 100
If you kept your date and times in a date time column type then you wouldn't have this problem. Consider changing.
There are mysql functions to calculate dates and time too
http://dev.mysql.com/doc/refman/5.6/en/datetime.html
If not, you can do sorting in PHP using usort.
I am trying to select all records in a table which have a date between the current date and 1 month ahead.
The date is stored like this DD-MM-YYYY
And the query I have tried:
SELECT * from tablename WHERE renewalDate BETWEEN DATE_FORMAT(CURDATE(),GET_FORMAT(DATE,'EUR')) AND DATE_ADD(DATE_FORMAT(CURDATE(),GET_FORMAT(DATE,'EUR')), INTERVAL 1 MONTH)
But this does not return the correct results.
Is the date stored in an actual date or datetime field? If it's in a char/varchar field, you won't be able to use the BETWEEN syntax, as mysql will just treat them as fixed strings.