I want to update a row which has timestamp datatype named date_start. Here's an example:
date_start = 2017-04-26 12:34:11
I want to update it, but to save the time, so it'll look like this:
date_start = 2017-05-28 12:34:11
Any ideas? So far I tried extract method and concat method.
Best Regards..
If you just want to update the date component of the timestamp while retaining the time component then you can build the updated timestamp using string concatenation with TIME():
UPDATE yourTable
SET date_start = CONCAT('2017-05-28 ', TIME(date_start))
WHERE <some condition>
Demo
Related
UPDATE table1
SET date1 = DATE_FORMAT(DATE_ADD(STR_TO_DATE(date1,'%m/%d/%Y'),INTERVAL 1 DAY),'%m/%d/%Y'),
date2 = date2 + 1*24*60*60
ORDER BY STR_TO_DATE(date1,'%m/%d/%Y') DESC;
I am trying to update all dates in table1 1 day a head (using MySql), I am using the query above.
in table1, ad_id + date1 represent a uniqe key and thats why I am using the Order By line.
this query worked on my local data base but when I run it on anther data base I get this error:
Duplicate entry '40001305194-07/02/2018' for key 'ad_id_2'
this doesn't make sense since in the data base their is no date 07/02/2018 for this ad_id.
and for date 07/01/2018 there is only 1 line for this ad_id.
what am I doing wrong, thanks in advance :)
How can I update only the time in an already existing DateTime field in MySQL? I want the date to stay the same.
Try this:
UPDATE yourtable
SET yourcolumn = concat(date(yourcolumn), ' 21:00:00')
WHERE Id = yourid;
Try this:
UPDATE t1 SET DateTimeField = CONCAT(DATE(DateTimeField),' 12:34:56');
UPDATE myTable
SET myDateTime = ADDTIME(DATE(myDateTime), #myTimeSpan)
WHERE id = #id;
Documented on MySQl date functions MySQL docs
I have solved in this way:
UPDATE table
SET myDateTime = CONCAT_WS(' ',DATE(myDateTime), CURTIME())
WHERE id = #id;
Obviously you should change CURTIME() with your desired time.
UPDATE myTable
SET myDateTime = ADDTIME(myDateTime, #myTimeSpan)
WHERE id = #id;
For exact syntax of function, see this.
Try this:
UPDATE sms
SET entry_period_end_date= entry_period_end_date+INTERVAL 6 Hour
WHERE TIME(entry_period_end_date) = '06:00:00';
UPDATE `table`
SET time = ADDTIME(time, INTERVAL 13 Hour);
Well, exactly what you are asking for is not possible. The date and time components can't be updated separately, so you have to calculate the new DateTime value from the existing one so that you can replace the whole value.
MySQL DEV page shows functions like subtime and difftime
A sample code to back the time all posts in 3 hours is above:
UPDATE tablepost SET datepost = SUBTIME( datepost , '0 3:0:0' );
Note that values 0 dont alter the respective field. Take care this code, use select first to test these function.
Reference: http://dev.mysql.com/doc/refman/5.5/en/date-and-time-functions.html#function_subtime
Asuming you have a DATE field and TIME field and want to inject the time into the date, try this:
UPDATE mytable
SET mydatefield = ADDTIME( DATE_FORMAT(mydatefield,'%Y-%m-%d 00:00:00'), mydatefield)
WHERE myid = ...
I used ADDTIME in the following way
Earlier in my cloud server, the DateTime was set to UTC but after changing the DateTime to Asia/Kolkata ie UTC 5:30 I wanted the same to reflect in my database tables.
I wanted to update the created_at and updated_at column by 5 hours 30 minutes. I did the following
To update all the rows of the table
UPDATE
products
SET
created_at = ADDTIME(created_at, '5:30:0'),
updated_at = ADDTIME(updated_at, '5:30:0')
You can omit the WHERE condition if you want to update all the records, but since my new records were updated with proper values. So only my rows below id less than 2500 must be updated
UPDATE
products
SET
created_at = ADDTIME(created_at, '5:30:0'),
updated_at = ADDTIME(updated_at, '5:30:0')
WHERE
id < 2500;
This what helped me. I convert time to minutes firstly: 150 for 2:30 am.
UPDATE lesson SET starts_at = DATE_ADD(Date(starts_at), INTERVAL 150 MINUTE)
Minutes are enough accurate for me, though you can use other units: https://dev.mysql.com/doc/refman/8.0/en/date-and-time-functions.html#function_date-add
I have the following mysql table:
tasks:
=====================
tid
status
desc
duedate
And i have the following records in that table:
records
===========================
1
active
Test description
08/15/2014
2
active
Another description
08/31/204
I am trying to get the days that there is a task for, in that particular month. I have the following query but when i run it it gets both records but "day" is null on both of them for some reason. Can someone please help me with this.
MYSQL QUERY
====================
SELECT DATE_FORMAT(due_date,'%d') AS day FROM tasks WHERE due_date BETWEEN '08/01/2014' AND '08/31/2014'
Try:
SELECT DAY(due_date) AS day
FROM tasks
WHERE due_date >= '2014-08'
AND due_date < '2014-09';
DAY() is a better function for what you want and I prefer using >= and < than BETWEEN for date comparisons, as it allows you to specify precise ranges more easily. Here, for example, you don't need to know the number of days in the month.
I have also used the default date format, which is preferable. If you need the, in my opinion, cray American date format, use DATE_FORMAT() in your SELECT.
This will only work with DATE, DATETIME and TIMESTAMP columns, which is how your due_date should be stored, preferably DATE.
UPDATE
To convert the VARCHAR column to DATE run:
UPDATE tasks SET due_date=STR_TO_DATE(due_date,'%m/%d/%Y')
Then change the type. Also remember to change your INSERT statements to use the default format.
You've got to convert those "date" strings to proper date values with STR_TO_DATE:
SELECT
DAY(STR_TO_DATE(due_date,'%m/%d/%Y')) AS day
FROM tasks
WHERE
STR_TO_DATE(due_date, '%m/%d/%Y')
BETWEEN STR_TO_DATE('08/01/2014' '%m/%d/%Y')
AND STR_TO_DATE('08/31/2014', '%m/%d/%Y')
else you're comparing strings instead.
Note:
It would be better to use a proper DATE or DATETIME column instead.
With the current VARCHAR format MySQL is unable to use indexes. That's very bad for performance.
You can convert your data by adding another column to your table:
ALTER TABLE tasks
ADD COLUMN new_due_date DATE;
Then you use an UPDATE statement to fill this new column
UPDATE tasks
SET new_due_date = STR_TO_DATE(due_date, '%m/%d/%Y');
If you don't need your old column anymore then you can delete this column and modify the new column to have the name of the old one. Then you will have your table with all your data in a DATE column.
im having a problem where i cant think of a solution, maybe im having a bad table-structure or i just dont know enough about mysql select commands to think of a good solution. Maybe you can help me out:
So i got a table that has a Column with the Date-format (yyyy-mm-dd) i wanted to select all upcoming dates so i did:
SELECT * WHERE date >= now.
This worked kinda well but i also got "dates" where only the year is entered (2014-00-00) i also wanted to select these but "now" is already bigger so i made another column with the year only and if the month, date or both arent known i will use 0000-00-00 and the Column "year" now i could select like this:
SELECT * WHERE date >= now AND year >=now(year)
Now all entrys with 0000-00-00 wont be selected. If i use OR the entrys from last year will be shown.
So thats my problem, is there any way i can change my table so i can have entries with only the year or only year and month and of course all together? I already considered get rid of the date-format and use simple INT with seperated columns for year, month and date. But i think i will have the same problem.
Sometimes i just want to do a capsuled select like
SELECT *
WHERE (date >= now AND year >= now(year))
OR date == "0000-00-00" (i know that this doesnt work)
If I understood your problem correctly, you could use this request:
WHERE (date >= now OR year > now(year))
There is probably a simpler way though, that would preserve your design, like initializing at January 1st (01-01) instead of 00-00
I think you can use this code:
$_SESSION['month'] = //set here your selected month
$_SESSION['year'] = //set here your selected year
SELECT * FROM table WHERE DATEPART(m,date) >= '".$_SESSION['month']."' AND DATEPART(yyyy,year) >= '".$_SESSION['year']."' AND date <> '0000-00-00'
Change your table structure format. Actually just allow for that field to have null value when not entered. By default it will be null then. You shouldn't be storing 0000-00-00 as a value for Date type field. I would rather leave it as null , or as suggested in some of previous answers, initialize it with some other date. It would be much easier to manipulate with database then.
the problem is that half of you write is not MySQL and your database schema is terrible...
You have the following problems:
column data date does not have the date data type.
To fix it, you need to add a cast to the select statement eg. cast(datecolumn as date)
select * from table where cast(datecolumn as date) >= '2014-01-10';
the way to use now date is using the now function.
select now(), date(now());
result> 2014-01-10 11:11:36, 2014-01-10
select * from table where cast(datecolumn as date) >= date(now());
Because your datecolumn is not a date (2014-00-00 is not a valid date), you need to use string manipulation to extract the year.
select substring('2014-01-01', 1,4)
result> 2014
select * from table where substring(datecolumn, 1,4) = year(now());
The comparassion operator is = and not ==
the select statement syntax looks like this (pay attention because you are missing the table in your statement)
select * from [Table] where [column] = condition ...
You probably need or instead of ands, therefore your query should look like this:
select * from FooTable where
cast(datecolumn as date) >= date(now())
or substring(datecolumn, 1,4) >= year(now())
or datecolumn = '0000-00-00'
You should use something like phpmyAdmin or mySQL workbench to test your sql queries before try to use them on php, java or whatever is your programing language.
I have a TIMESTAMP column containing:
2011-10-12 12:00:00
Now I want to be able to take user input to change the time only, and not the date. So, if the user inputs 5:00 pm I first convert the input to 17:00:00, then my problem is UPDATING the TIMESTAMP to 2011-10-12 17:00:00 without overwriting the date. The user can pick any time, but they are restricted to this day, and I need to store the date and time in the same column like this because it's already used in many other parts of the application.
Note: I would prefer not to SELECT the TIMESTAMP first before updating if it's possible to UPDATE just the TIME portion without a SELECT.
I looked at DATE TIME functions and there are lots of ways of adding an interval to the time, but I don't see anyway to set it to something specific.
update table
set datetime_field = concat_ws(' ',date(datetime_field), '17:00:00') where id = x
UPDATE tab
SET ts_field = ADDTIME(DATE(ts_field), new_time)
WHERE id = ?;