I have a doubt regarding the sqlite command that should be written for getting the name of MIN(count) and MAX(timestamp) and after retrieving, timestamp should be set for current timestamp amd and count should be incremented by 1.
For the first time, the table will be updates sa follows -
and for the next time, i have to update the timestamp for lil to current timestamp. Then for the third time, jil's timestamp must be updated.
I have tried to work with this, but I am getting logical errors, the table is not getting updated as per the requirement. How can I implement this?
I have solved the problem by making changes in the database. Initially, I have set the timestamp in descending order. then I wrote command to to display name with min(count)and min(timestamp) and updated in the same order. This worked for me.
Related
The table doesn't have any date time column. I want to if there is any inbuilt keyword which can does that.
I want to know all commits done after a particular date.
If flashback is enabled on the database you can get records on the table in an around a particular date range in Oracle.(It purely depends on if its enabled and for how long the flashback needs to be kept)
You can query to see the data in the table as of 3 days back as follows
select *
from table as of timestamp sysdate-3
I'm facing currently very, very strange behaviour.
I have an enterprise application, running on JBoss, the ORM is as you might expect hibernate and I'm doing some bulk operations.
I have a table and in that table there are all kind of fields and among the others there is a field of type DATETIME. In this field I'm saving user info, I have another field of the same type, configured with an trigger, so every time when the row is being updated the second DATETIME field is also updated.
I have a case where the first field should be increased with one second, so I'm doing bulk copy something like this:
UPDATE <TABLE_NAME> SET customerDATE = DATE_ADD(customerDATE, INTERVAL 1 SECOND)
My problem is that the query does not always work as expected.
What I see is that the second DATETIME field(the onne with the trigger) is being updated, together with some other fields, but the auto-increment with one second does not alway works(sometimes is also increased, sometimes not).
I tried searching for some known issues, but without success.
If anybody knows some problem in this direction I would really appreciate any help!
I'm testing now if there will be problems with more than an extra second.
Thanks in advance!
I think title is clear what is my problem. I am working with MySql I just wanted to know what was the first registration on my website and when I sorted the table according to timestamp, the id of people who registered on the website were not true. The Image bellow will show what do I mean:
and this is the code what phpMyAdmin created:
SELECT *
FROM `table`
ORDER BY `table`.`timestamp` ASC
LIMIT 0 , 30
whats wrong with my table time? and why id is not ordered same as timestamps
If we assume that id is an auto-increment field, then this is almost certainly due to the fact that timestamp column is not assigned at the same physical time the id column is assigned. For example, if you have a multi-page registration from a website application, the initial object may be inserted into the database to contain the initial data fields gathered on the first page. But perhaps the timestamp is only set after the final page of registration is complete. So depending on the time the user takes to complete registration, the timestamp can be out-of-sync with the id order.
There are multiple ways to work around this. One way is to assign timestamp when the record is first inserted into the database, or you could use a DB insert trigger to populate the timestamp field instead.
There is also the possibility that timestamp represents the date and time the user last modified their profile (or otherwise caused modification of the database record). In this case, the timestamp could be changing to a "future" value while the id stays constant.
I am trying to write a query to extract records updated in the last 2 hours in SQL Server 2008.
Could anyone help me write this?
select * from table where table.date1>=dateadd(hh,-2,getdate())
dateadd() function lets you subtract hours from getdate() letting you choose records updated past 2 hours
First, you have to design the table so you have a field where the time of the last change will be stored
Then, whenever you update a row, update the value in the 'last update' field. After that, you can use a script such as suggested by Vijaykumar
The downside of this method is that when a single record was changed more than once in the specified time period, you will be notified only about the time of the last update.
Another solution for tracking the updates is to read the database online transaction log file, but you'll need a third party tool for that
I have a simple problem for which I found a solution in early testing but cannot replicate now that I need to do it for real.
We are moving our news system from CuteNews to our self-built MySQL system. All the news has been imported into the database but the date field is Timestamp. I have created a new field (created_date) and want to populate this from the Timestamp in the date field.
As I said, I did do this previously in an early trial run and was convinced that the query I used, via PhpMyAdmin was along the lines of UPDATE News set created_date=UNIX_TIMESTAMP(date). This is probably slightly wrong as I am at work and posting from my phone but it was along those lines.
No errors were returned but all 'created_date' fields were populated as 0000-00-00 00:00 not with the date taken from the Timestamp in the date field.
I know it is simple and know the answer will be obvious when I see it but any pointers would be gratefully appreciated!
Steve.
EDIT: reading back through I realised a bit of what I posted may be misleading. In my original trial run using the update query put the correct DateTime in the field based on the corresponding Timestamp field. It is only this time that it shows 0000-00-00 00:00.
Ps. Thanks for the format tidy-up. It's a bit awkward on a phone!
I knew I was nearly there!! It was not UNIX_TIMESTAMP but FROM_UNIXTIME I was after.
UPDATE news SET created_date = FROM_UNIXTIME(date)
Thanks for the help.
Steve