Benefit from a mission critical IT monitoring with Monitis Premium or get it FREE for your entry level monitoring needs.
-Over 200,000 users
-More than 300,000 websites monitored
-Used in 197 countries
-Recommended by 98% of users
COURSE of the MONTH
12 days, 11 hours left to enrollBecome a Premium Member and unlock a new, free course in leading technologies each month.
Solved
sql server - how to query specific time - T SQL
Posted on 2012-12-31
I have a timestamp field.
I need to query all the records for the hour.. A record for 1,2,3 o'clock.
The data looks like
2012-11-01 01:00:00
2012-11-01 01:15:00
2012-11-01 01:45:00
2012-11-01 02:00:00
2012-11-01 02:15:00
2012-11-01 03:00:00
How do query for the full hour?
I need to query all the records for the hour.. A record for 1,2,3 o'clock.
The data looks like
2012-11-01 01:00:00
2012-11-01 01:15:00
2012-11-01 01:45:00
2012-11-01 02:00:00
2012-11-01 02:15:00
2012-11-01 03:00:00
How do query for the full hour?
[X]
Welcome to Experts Exchange
Add your voice to the tech community where 5M+ people just like you are talking about what matters.
- Help others & share knowledge
- Earn cash & points
- Learn & ask questions
2-
2
- +1
6 Comments
Active 2 days ago
This will give you the basic structure of the query:
select * from your_table
where column_name between convert(datetime, '2012-11-01 01:00:00', 120) and convert(datetime, '2012-11-01 02:00:00', 120)
select * from your_table
where column_name between convert(datetime, '2012-11-01 01:00:00', 120) and convert(datetime, '2012-11-01 02:00:00', 120)
Active 1 day ago
Just so you understand, a TimeStamp field is not the same as a Date/Time field. According to Microsoft:
"It is used as a mechanism for version-stamping table rows. The storage size is 8 bytes. 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."
"It is used as a mechanism for version-stamping table rows. The storage size is 8 bytes. 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."
Active 1 day ago
Most important are:
1) not to perform any function on the column itself
2) not to count the same row more than once
I strongly recommend the style below for ALL date/datetime checks:
--query for 1AM rows only
WHERE
datetime_column >= '20121101 01:00:00' AND
datetime_column < '20121101 02:00:00'
Leaving out the dashes prevents any conversion errors ('YYYYMMDD' is always interpreted correctly) and/or misunderstandings about what the date value represents.
Using >= and < rather than between avoids counting rows on the exact hour twice.
1) not to perform any function on the column itself
2) not to count the same row more than once
I strongly recommend the style below for ALL date/datetime checks:
--query for 1AM rows only
WHERE
datetime_column >= '20121101 01:00:00' AND
datetime_column < '20121101 02:00:00'
Leaving out the dashes prevents any conversion errors ('YYYYMMDD' is always interpreted correctly) and/or misunderstandings about what the date value represents.
Using >= and < rather than between avoids counting rows on the exact hour twice.
But I have many dates!
What about this...
First
SUBSTRING( CONVERT(nvarchar(30), TIMESTAMP, 120),15,5) AS DT
then
select .... WHERE DT = '00:00'
What about this...
First
SUBSTRING( CONVERT(nvarchar(30), TIMESTAMP, 120),15,5) AS DT
then
select .... WHERE DT = '00:00'
Active 1 day ago
If you just want to group a lot of rows by their hours only, ignoring dates, do as below.
Yes, it uses a function on the column, but when you want all values you have to:
SELECT
HOUR(TIMESTAMP) AS HR,
...
FROM dbo.tablename
--OPTIONAL!: for example, all records for current year only
--WHERE
--TIMESTAMP >= '20120101' AND TIMESTAMP < '20130101'
GROUP BY
HOUR(TIMESTAMP)
ORDER BY
HOUR(TIMESTAMP)
If you want to see days, but only one row per hour per day, you can do this:
SELECT
DATEADD(HOUR, DATEDIFF(HOUR, 0, TIMESTAMP), 0) AS DT,
...
FROM dbo.tablename
--OPTIONAL!: for example, all records for current year only
--WHERE
--TIMESTAMP >= '20120101' AND TIMESTAMP < '20130101'
GROUP BY
DATEADD(HOUR, DATEDIFF(HOUR, 0, TIMESTAMP), 0)
ORDER BY
DATEADD(HOUR, DATEDIFF(HOUR, 0, TIMESTAMP), 0)
Yes, it uses a function on the column, but when you want all values you have to:
SELECT
HOUR(TIMESTAMP) AS HR,
...
FROM dbo.tablename
--OPTIONAL!: for example, all records for current year only
--WHERE
--TIMESTAMP >= '20120101' AND TIMESTAMP < '20130101'
GROUP BY
HOUR(TIMESTAMP)
ORDER BY
HOUR(TIMESTAMP)
If you want to see days, but only one row per hour per day, you can do this:
SELECT
DATEADD(HOUR, DATEDIFF(HOUR, 0, TIMESTAMP), 0) AS DT,
...
FROM dbo.tablename
--OPTIONAL!: for example, all records for current year only
--WHERE
--TIMESTAMP >= '20120101' AND TIMESTAMP < '20130101'
GROUP BY
DATEADD(HOUR, DATEDIFF(HOUR, 0, TIMESTAMP), 0)
ORDER BY
DATEADD(HOUR, DATEDIFF(HOUR, 0, TIMESTAMP), 0)
Featured Post
We value your feedback.
Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!
Question has a verified solution.
If you are experiencing a similar issue, please ask a related question
Why is this different from all of the other step by step guides? Â Because I make a living as a DBA and not as a writer and I lived through this experience.
Defining the name:
When I talk to people they say different names on this subject stuff l…
Recently we ran in to an issue while running some SQL jobs where we were trying to process the cubes. We got an error saying failure stating 'NT SERVICE\SQLSERVERAGENT does not have access to Analysis Services. So this is a way to automate that wit…
This videos aims to give the viewer a basic demonstration of how a user can query current session information by using the SYS_CONTEXT function
Via a live example, show how to backup a database, simulate a failure backup the tail of the database transaction log and perform the restore.
Suggested Courses
Course of the Month12 days, 11 hours left to enroll
777 members asked questions and received personalized solutions in the past 7 days.
Join the community of 500,000 technology professionals and ask your questions.