I've tried looking around for this but I can't find an answer that seems to work with the code I'm using. Basically, the below query searches on any result from the current date. I'm trying to make it so it will search only on the last hour.
In oracle I could do this using sysdate-1/24, is there a simple equivalent within SQL server? Bearing in mind I'm already using cast to get the current sysdate.
Select distinct m_record_server
from search_recording_file1
where tr_date_recorded >= cast(convert(varchar(10), getdate(), 110) as datetime)
and m_record_server is not null
You can use:
getdate() - 1.0/24
SQL Server allows you to use such arithmetic on datetime.
The more common way would be:
dateadd(hour, -1, getdate())
In your query, you do not need to cast to a string at all:
Select distinct m_record_server
from search_recording_file1
where tr_date_recorded >= getdate() - 1.0/24 and m_record_server is not null;
If you want the date that was there one hour ago (which seems to be the intent of the code, if not the rest of the question):
Select distinct m_record_server
from search_recording_file1
where tr_date_recorded >= cast(getdate() - 1.0/24 as date) and m_record_server is not null;
Related
I need to retrieve data from a table that has date referenced only the previous day, I am trying to do with the query below but I am not getting:
SELECT
Log.ValorEntrada, Log.DataHoraEvento, Log.NumeroEntrada
FROM
Log
WHERE
Log.DataHoraEvento = (GETDATE()-1)
How can I get this result?
In SQL Server, GETDATE() has a time component. I would recommend:
WHERE Log.DataHoraEvento >= CAST(GETDATE()-1 as DATE) AND
Log.DataHoraEvento < CAST(GETDATE() as DATE)
This condition is "sargable", meaning that an index can be used. The following also is:
WHERE CONVERT(DATE, Log.DataHoraEvento) >= CONVERT(DATE, GETDATE())
Almost all functions prevent the use of indexes, but conversion/casting to a date is an exception.
Finally, if you don't care about indexes, you can also write this as:
WHERE DATEDIFF(day, Log.DataHoraEvento, GETDATE()) = 1
DATEDIFF() with day as the first argument counts the number of "day" boundaries between the two date/times. Everything that happened yesterday has exactly one date boundary.
If DataHoraEvento is a DATETIME, its likely that it has the full time, hence GETDATE()-1 isn't getting any matches. You should search for a range like this:
SELECT L.ValorEntrada, L.DataHoraEvento, L.NumeroEntrada
FROM dbo.[Log] L
WHERE L.DataHoraEvento >= CONVERT(DATE,DATEADD(DAY,-1,GETDATE()))
AND L.DataHoraEvento < CONVERT(DATE,GETDATE());
SELECT Log.ValorEntrada, Log.DataHoraEvento, Log.NumeroEntrada
FROM Log
WHERE Log.DataHoraEvento >= DATEADD(dd,DATEDIFF(dd,1,GETDATE()),0)
AND Log.DataHoraEvento < DATEADD(dd,DATEDIFF(dd,0,GETDATE()),0)
You should also use SYSDATETIME() (if you on SQL Server 2008+) instead of GETDATE() as this gives you datetime2(7) precision.
You can try this :
MEMBER BETWEEN DATEADD(day, -2, GETDATE()) AND DATEADD(day, -1, GETDATE())
I was wondering if someone could help me as I can't seem to find an answer to the following that I have been searching for.
Select
Count(pm1.number) As number
From
SCenter.probsummarym1 As pm1
Where
pm1.open_time >= Today()
I have the above that works great if I put in the date as '01-05-2015'
But I want today's date each day when it refreshes.
Sorry if this is pretty basic but I am just lost on this one
GETDATE() will return the current date and time.
You may then use a CAST() or CONVERT() to strip the time value and be left with just the date, ie.
SELECT CONVERT(VARCHAR(10), GETDATE(), 110)
The above code would return 05-19-2015 for today.
Select
Count(pm1.number) As number
From SCenter.probsummarym1 As pm1
Where
pm1.open_time >= GETDATE() //or CONVERT(VARCHAR(10), GETDATE(), 110)
I have a column that stores data in datetime format. I want to check for all instances where the time part of this column is not equal to 00:00:00:000 - the date does not matter.
Basically, if time() was a function, something like this:
SELECT *
FROM progen.DY
WHERE TIME(DY_DATE) <> '00:00:00:000'
How do I go about doing this?
You only need a minor tweak on what you already have.
SELECT *
FROM progen.DY
WHERE TIME(DY_DATE) <> '00:00:00:000'
Use CONVERT to change your DATETIME to a TIME.
SELECT *
FROM progen.DY
WHERE CONVERT(TIME, DY_DATE) <> '00:00:00:000'
Another way is to convert it to different datatype, eg
SELECT *
FROM progen.DY
WHERE CAST(DY_DATE as float) - CAST(DY_DATE as int) > 0
SQLFiddle Demo
I do this all the time when trying to see if a table's column should be turned into a date instead of a datetime, which is really the answer.
select *
from progen.dy
where cast(dy_date as Date) <> dy_date
the cast removes the time and datetime has higher precedence, so when compared, if the are unequal then it has a time value. Same thing could be done with a cast to time, with a bit of different syntax.
Use DATEDIFF and DATEADD to instead get the date part of the datetime. Compare the column against the date only, and it will return those rows that have a non-zero time.
The way this works is that we first calculate the difference (in days) between the epoch and the value. We add that number to the epoch to create a new datetime. Since the result of DATEDIFF is an integer, any time component gets rounded off.
SELECT *
FROM Table
WHERE DateColumn <> DATEADD(d, DATEDIFF(d, 0, DateColumn), 0)
The time function could then be implemented by the following, not that I recommend it for this specific scenario:
SELECT DATEDIFF(minute, DATEADD(d, DATEDIFF(d, 0, DateColumn), 0), DateColumn) as MinutesIntoDay,
-- or, if you require higher precision
DATEDIFF(second, DATEADD(d, DATEDIFF(d, 0, DateColumn), 0), DateColumn) as MinutesIntoDay
FROM Table
Edit: As mentioned in other answers, you can cast to DATE to achieve the same effect as DATEADD(d, DATEDIFF(d, 0, DateColumn), 0), which cleans up nicely. However, DATE was only added in SQL Server 2008, whereas the formula has compatibility back to at least SQL 2000. So if you need the backwards compatibility or are dealing with SQL CE, casting to DATE is unavailable.
SELECT *
FROM progen.DY
WHERE CONVERT(TIME, DY_DATE - CONVERT(DATE, DY_DATE)) > '00:00'
I'm working with SQL Server 2005.
I have a column called purchase_time of type datetime. How do I select this column with the time part - just the date.
Thanks,
Barry
EDIT:
Would it be safe to get the datetime and split it via Python on the first space, or is this format locale dependant?
In versions < 2008 (which, based on other comments to some of the answers, I believe you are running), the most efficient way is to keep it as a datetime type and use date math to avoid string conversions.
SELECT DATEADD(DAY, DATEDIFF(DAY, '20000101', purchase_time), '20000101')
FROM dbo.table;
EDIT
If you want the date only for display purposes, not for calculations or grouping, that is probably best handled at the client. You can do it in SQL simply by saying:
SELECT dt = CONVERT(CHAR(10), purchase_time, 120)
FROM dbo.table;
In SQL Server 2008 you can use the newly added date type:
select convert(date, purchase_time) from TableName
Update:
In versions prior to SQL 2008, I used the following solution for this problem:
select convert(datetime, convert(int, convert(float, purchase_time)))
from TableName
I hope anyone can translate my abstract query.
I want to select * from TABLE where ( [MYDATETIMEROW] < (TODAY - 3 Days)).
Does I have to Convert, cast or use datepart or anything else?.. im confused.
Are there simple rules? I would'nt have problems to do that with linq but simple sql I learned just hardly.
Thank you and best regards.
In simple terms:
Select * from Table where MyDateTimeRow < dateadd(dd,-3,getdate())
But using getdate() will provide both a date and a time, experience says that this is unlikely to be exactly what you want - you might want to strip the time down and just consider the date portion
Select * From Table where MyDateTimeRow < dateadd(dd, datediff(dd, 0, getdate()) - 3, 0)
You want the DateAdd function to manipulate dates and the GetDate function to get the current date:
SELECT * FROM MyTable WHERE [MyDateTimeRow] < DateAdd(dd, -3, GetDate())