Anyone know how to extract the date from a datetime stamp as part of the where clause?
eg.
select *
from tableA
where date between '01/08/2009' and '31/08/2009'
(Date is a timestamp!)
Many thanks,
Fiona
If this is sql server, it's not possible. The timestamp data type's name is misleading, as it does not store any date information of any kind. All it holds is a sequential value that allows you to establish record order (eg, item A was created before item B), and therefore you don't have enough information in that column alone to know on what day the row was created.
Since the link I provided is Sql Server 2000 specific, also check this link for information on SQL Server 2008:
http://msdn.microsoft.com/en-us/library/ms182776.aspx
timestamp is the synonym for the rowversion data type and is subject to the behavior of data type synonyms. In DDL statements, use rowversion instead of timestamp wherever possible.
To build a real timestamp column in Sql Server, use a DateTime (or DateTime2) data type and set it's default value to getdate() or current_timestamp.
If a real datetime value, not TIMESTAMP/ROWVERSION which is binary(8)...
SELECT DATEADD(DAY, DATEDIFF(DAY, 0, #MyValue), 0)
Related
I have an issue where I created a column sent_Date of type nvarchar while it's storing date and time.
Now when I try to sort it by date, it's not doing so correctly.
I am using this query:
select *
from tbl_skip
where sent_date > '9/27/2020 7:29:11 PM'
order by SENT_DATE desc
Like the comments have said, the real solution here is fix your design. That means changing the column's data type an nvarchar to a date and time data type, I'm going to use a datetime2(0) here, as your data is accurate to a second, so seems the most appropriate.
Firstly we need to convert the value to as ISO value. I'm also, however, going to create a new column called Bad_Sent_Date, to store values that could not be converted. Experience has taught many of us that systems that incorrectly use string data types to store dates (or numerical data) rarely have good data integrity rules on the value (because if they did, it wouldn't be an nvarchar) to start, so have bad values like '29/02/2019' or mix styles, such as having both '09/29/2020' and '29/09/2020'.
Based on the single example we have, I will assume your data is supposed to be in the format MM/dd/yy hh:mm:ss AM/PM:
ALTER TABLE dbo.tbl_skip ADD Bad_Sent_Date nvarchar(30) NULL;
GO
UPDATE TABLE dbo.tbl_skip
SET Bad_Sent_Date = CASE WHEN TRY_CONVERT(datetime2(0),Sent_date,101) IS NULL THEN Sent_date END,
Sent_Date = CONVERT(nvarchar(30),TRY_CONVERT(datetime2(0),Sent_date,101),126);
GO
Now we have an ISO format, we can change the table's data type:
ALTER TABLE dbo.tbl_skip ALTER COLUMN Sent_date datetime2(0) NULL;
Note that if you do have constraints on the column Sent_date, or it isn't NULLable, you will first need to DROP said CONSTRAINTs, change the column to be NULLable and then recreate said CONSTRAINTs after you have altered the column.
You can also review the "dates" that failed to be converted with the following:
SELECT bad_sent_date
FROM dbo.tbl_skip
WHERE bad_sent_date IS NOT NULL
AND Sent_date IS NULL;
Once that's all done, then your query simply needs an update to use an unambiguous date literal, and it'll work:
SELECT *
FROM tbl_skip
WHERE sent_date > '2020-09-27T19:29:11' --'9/27/2020 7:29:11 PM'
ORDER BY SENT_DATE DESC;
You can convert the data from string to datetime.
Please note i used 100 as an example to convert to date time. You can use below link to see if its behaving correctly. link -https://www.w3schools.com/sql/func_sqlserver_convert.asp
select *
from tbl_skip
where sent_date > convert(datetime,'9/27/2020 7:29:11 PM',100)
ORDER BY CONVERT(datetime,SENT_DATE,100) desc
You should be able to convert it to a datetime
select *
from tbl_skip
where sent_date > '9/27/2020 7:29:11 PM'
order by convert(datetime,SENT_DATE) desc
Just make sure the data in column is legit. If so, it would make sense to convert the column type to a datetime.
alter table tbl_skip alter column SENT_DATE datetime
If the data is mixed, you may need to fix it or use something like
order by try_convert(datetime,SENT_DATE) desc
I have a field that when something is inserted I want it to get the current Date & Time and insert this into the database. Is there a way to get the date & time, and set it as the default value?
Currently the default value is: (getdate()) Which sets only the date. How do I also set the time?
GETDATE() is a date and time in SQL Server.
Run SELECT GETDATE() to verify this.
What is the datatype of your field? If it's DATE then it will not hold time values as well.
One easy way is to give the field a default constraint:
create table YourTable
(
... other columns ...
CreateDt datetime default getdate(),
... other columns ...
)
A disadvantage of this method is that you can overwrite the value by specifying it in an insert clause.
Personally I would like to use GETUTCDATE() instead GETDATE() to avoid confusions.
SYSDATETIME() will get the current date and time.
Make sure the data type of the column is datetime, and not just date or it won't be able to hold a datetime.
Most SQL implementations (engines) do have CURRENT_TIMESTAMP function.
please tell me how to show the value of timestamp field of a table in datetime format (human understandable). and also how to use it in comparison while querying it.
Thanks
This can't be done. The TIMESTAMP datatype is misnamed - the name has been deprecated in favour of ROWVERSION in SQL 2008, which is a much clearer name.
TIMESTAMP stores an incrementing value which changes every time a row is updated.
If you want last updated dates stored against each row, you will need to add a DATETIME or SMALLDATETIME to your table and update it with the current date on each update.
You mean timestamp data type I think - http://msdn.microsoft.com/en-us/library/ms182776%28v=SQL.90%29.aspx
You can't convert it to datetime. According to the documentation in the link above :
> The timestamp data type is just an incrementing number and does not preserve a date or a time. To record a date or time, use a datetime data type.
Is there a way to insert only date in a datetime column in sql server without the time?
for example
date (datetime)
===============
12-01-2000
16-02-2000
or i should store this as a varchar and cast it when retriving so that i can convert to whatever form i need.
my solution is to store it as varchar and convert it to datetime whenever needed
SELECT CONVERT(VARCHAR(10),GETDATE(),111) -- get datepart only
or
also check this post about creating date type :
create user defined data types:
create type Date from dateTime
http://weblogs.sqlteam.com/jeffs/archive/2007/10/31/sql-server-2005-date-time-only-data-types.aspx
If you are using SQLServer 2008 you can use the date data type.
The following SQL will strip out any time values and set them all to zero. So you won't need to worry whether a time value is there or not.
Select Cast(Floor(Cast(MyDateColumn as float)) as DateTime) as MyDateColumn
From dbo.MyTable
Just use smalldatetime or date. Convert your dates to your format before you update your date values or after you select date values in your app.
You can change format of date format in sql queries or in your app.
Here is a list on date formats in sql
http://www.sql-server-helper.com/tips/date-formats.aspx
Here's a link on date data types
http://databases.about.com/od/sqlserver/a/date_time.htm
Good Luck!
How to Insert Only Date and Only time in the table(column datatype is DateTime) using SQL Server 2005.
As far as I know, Date and Time are always stored together. The intern representation of it is a number, that represents timeticks that are passed since a certain moment.
You can of course filter the date info and the time info out of it and store it as for example a string.
Or you can make a userdefined type as shown here : http://weblogs.sqlteam.com/jeffs/archive/2007/10/31/sql-server-2005-date-time-only-data-types.aspx