I have a sql server 2012 table with a bunch of columns - none of these columns are a date/time stamp. Is there any way to get the date the rows were entered? Is there a hidden sys column somewhere that I can latch onto, just as a temporary measure?
No hidden sys column, but if you are using transaction logging you can try a log reader to view all the INSERT statements on the table.
To be able to use the date information. You should add a new column such as time_stamp and define an after insert trigger. Good luck.
Related
I ma trying to capture cpu usage of my current SQL server over a time period and came across a query from here
Please guide me how can i use the above query to insert the results in permanent table over collected period of time without overwriting timestamp values or duplicating entries?
Thanks
You could use a scheduled job to execute the query and insert data into your table
https://learn.microsoft.com/en-us/sql/ssms/agent/schedule-a-job?view=sql-server-ver15
If you use the syntax
INSERT INTO dbo.sysUseLig
SELECT --the query
Having previously created your table dbo.sysUseLig with columns with the correct data types you will have what you need.
There is a timestamp based column in the select.
I would like to write a SQL Server query which should get the difference between two dates (i.e. dates are available in two columns named "Start date" and "End date"). I would like to find the difference between two dates in these two different columns and update in another column as "Expired" if the difference is -1 or below. Most importantly: The time should start from the specified start date and it should check periodically.
To find the differential between two date values you use the DATEDIFF() function.
Also, depending on your requirements, you can set this up in your table as a Computed Column. That way any changes to the component columns in the computed column's definition will automatically update the computed column to reflect the new values.
With the PERSISTED keyword you can also allow the computed column to be indexed on.
Check the documentation here for more details: https://technet.microsoft.com/en-us/library/ms191250%28v=sql.105%29.aspx
This is based on what I think you are trying to do, it's not exactly clear.
I don't think you want to add a column to your table to identify what is expired because that column would be dependant on the "End Date" column as well as the primary key which would violate the 3rd normal form. It really shouldn't be needed because you can query out which ones are expired at any time. I can't really think of a scenario where you would need to have a column that indicates expiry. You can create a query like others mentioned to display (not create) another column that marks the expired rows, or you can simply display only the ones expired, or it might make more sense to move them to a different table.
SET IDENTITY_INSERT ExpiredTableName ON
INSERT INTO ExpiredTableName (Column1, Column2, StartDate, EndDate)
SELECT *
FROM TableName
WHERE DATEDIFF(day, InvoiceDate, '2015-04-20') >0
Identity Insert is for auto-generated keys only.
You can run your queries at regular time intervals like was already mentioned.
You can use DATEDIFF and case when like this:
update table set expColumn = case when DATEDIFF(day,start_date,end_date) > 0
then 'Expired' end FROM table
Hope this helps.
Is there a way to tell the last date time any table records were modified in SQL Server 2012? without having to put in a column for last update in table.
The idea is not to query say a 10 million record table when no rows were changed.
Is there a way to tell the last date time any table records were
modified in SQL Server 2012? without having to put in a column for
last update in table.
Yes - you can write an update/insert/delete trigger on the table that records the fact that an update happened along with the date and time.
The idea is not to query say a 10 million record table when no rows
were changed.
You might also want to look at the built in Change Tracking features
I have a SQL server database table that contain a few thousand records. These records are populated by PowerShell scripts on a weekly basis. These scripts basically overwrite last weeks data so the table only has information pertaining to the previous week. I would like to be able to take a copy of that tables data each week and add a date column with that day's date beside each record. I need this so can can do trend analysis in the future.
Unfortunately, I don't have access to the PowerShell scripts to edit them. Is there any way I can accomplish this using MS SQL server or some other way?
You can do the following. Create a table that will contain the clone + dates. Insert the results from your original table along with the date into your clone table. From your description you don't need a where clause because the results of the original table are wiped out only holding new data. After the initial table creation there is no need to do it again. You'll just simply do the insert piece. Obviously the below is very basic and is just to provide you the framework.
CREATE TABLE yourTableClone
(
col1 int
col2 varchar(5)...
col5 date
)
insert into yourTableClone
select *, getdate()
from yourOriginalTable
i have an requirment like this i need to delete all the customer who have not done transaaction for the past 800 days
i have an table customer where customerID is the primary key
*creditcard table have columns customerID,CreditcardID, where creditcard is an primary key*
Transcation table having column transactiondatetime, CreditcardID,CreditcardTransactionID here is the primarary key in this table.
All the transcationtable data is in the view called CreditcardTransaction so i am using the view to get the information
i have written an query to get the creditcard who have done transaction for the past 800 days and get their CreditcardID and store it in table
as the volume of data in CreditcardTransaction view is around 60 millon data the query what i have writeen fails and logs an message log file is full and throws message system out of memory exception.
INSERT INTO Tempcard
SELECT CreditcardID,transactiondatetime
FROM CreditcardTransaction WHERE
DATEDIFF(DAY ,CreditcardTransaction.transactiondatetime ,getdate())>600
As i need to get the CreditcardID when was their last Transactiondatetime
Need to show their data in an Excel sheet so, i am dumping in data in an Table then insert them into Excel.
what is teh best solution i show go ahead here
i am using an SSIS package(vs 2008 R2) where i call an SP dump data into Table then do few business logic finally insert data in to excel sheet.
Thanks
prince
One thought: Using a function in a Where clause can slow things down - considerably. Consider adding a column named IdleTransactionDays. This will allow you to use the DateDiff function in a Select clause. Later, you can query the Tempcard table to return the records with IdleTransactionDays greater than 600 - similar to this:
declare #DMinus600 datetime =
INSERT INTO Tempcard
(CreditcardID,transactiondatetime,IdleTransactionDays)
SELECT CreditcardID,transactiondatetime, DATEDIFF(DAY ,CreditcardTransaction.transactiondatetime ,getdate())
FROM CreditcardTransaction
Select * From Tempcard
Where IdleTransactionDays>600
Hope this helps,
Andy
Currently you're inserting those records row by row. You could create a SSIS package that reads your data with an OLEDB Source component, performs the necessary operations and bulk inserts them (a minimally logged operation) into your destination table.
You could also directly output your rows into an Excel file. Writing rows to an intermediate table decreases performance.
If your source query still times out, investigate if any indexes exist and that they are not too fragmented.
You could also partition your source data by year (based on transactiondatetime). This way the data will be loaded in bursts.