This is OrientDb 2.1.4.
The following query works fine:
select from SyncableHist where history_date <= date('2016-04-12 21:25:17','yyyy-MM-dd HH:mm:ss')
and returns as expected three records and each records has the value of history_date = '2016-04-12 21:25:17'. The history_date is a DATETIME type.
However this does not return any records:
select from SyncableHist where history_date = date('2016-04-12 21:25:17','yyyy-MM-dd HH:mm:ss')
Any ideas???
Thanks!
Format your date to string before compare. Not sure why, but probably have something extra like miliseconds or your database can't compare both this way.
select from SyncableHist where history_date.format('yyyy-MM-dd HH:mm:ss') = '2016-04-12 21:25:17'
Related
I'm trying to translate this SQL statement to LINQ:
SELECT sessionid, userid, CAST(sessiondate AS DATETIME) + CAST(sessiontime AS DATETIME) AS sessiondatetime FROM sometable
where sessiondate is of type DATE and sessiontime is of type TIME.
I've tried the following:
var query = from session in table
select new
{
session.Id,
session.UserId,
DateTime = session.Date + session.Time
};
where table is the return value of a GetTable<Session>() call on a DataContext instance and the Session class maps sessionid to Id, userid to UserId, sessiondate to Date (DateTime), and sessiontime to Time (TimeSpan).
The LINQ gets translated to this rather lengthy SQL statement:
SELECT [t0].[sessionid] AS [Id], [t0].[userid] AS [UserId], CONVERT(DateTime,DATEADD(HOUR, DATEPART(HOUR, [t0].[sessiontime]), CONVERT(DateTime,DATEADD(MINUTE, DATEPART(MINUTE, [t0].[sessiontime]), CONVERT(DateTime,DATEADD(SECOND, DATEPART(SECOND, [t0].[sessiontime]), CONVERT(DateTime,DATEADD(MILLISECOND, DATEPART(MILLISECOND, [t0].[sessiontime]), [t0].[sessiondate])))))))) AS [DateTime] FROM [sometable] AS [t0]
Unfortunately, when attempting to execute that statement, it tells me that "The datepart millisecond is not supported by date function dateadd for data type date." I'm guessing it's unhappy about the DATEADD call with milliseconds. Is there a way to fix this?
Edit: note that both session.Date and session.Time are nullable.
That unfortunate data structure makes the code unfortunately ugly:
var query = from session in table
select new
{
session.id,
session.userid,
combinedDate = new DateTime(
session.Date.Year, session.Date.Month, session.Date.Day,
session.Time.Hour, session.Time.Minute, session.Time.Second,
session.Time.Millisecond)
};
Can anybody please guide me in writing this below SQL in U-SQL language used in Azure Data Lake
select tt.userId, count(tt.userId) from (SELECT userId,count(userId) as cou
FROM [dbo].[users]
where createdTime> DATEADD(wk,-1,GETDATE())
group by userId,DATEPART(minute,createdTime)/5) tt group by tt.userId
I don't find the DATEPART function in U-SQL . Azure Data Analytic job is giving me error.
U-SQL does not provide T-SQL intrinsic functions except for a few (like LIKE). See https://msdn.microsoft.com/en-us/library/azure/mt621343.aspx for a list.
So how do you do DateTime operations? You just use the C# functions and methods!
So DATEADD(wk, -1, GETDATE()) is something like DateTime.Now.AddDays(-7)
and
DATEPART(minute,createdTime)/5 (there is an extra ) in your line) is something like createdTime.Minute/5 (maybe you need to cast it to a double if you want non-integer value).
For anybody who is looking for the implementation mentioned by Michael. It's like below
#records =
EXTRACT userId string,
createdTime DateTime
FROM "/datalake/input/data.tsv"
USING Extractors.Tsv();
#result =
SELECT
userId,
COUNT(createdTime) AS userCount
FROM #records
WHERE createdTime > DateTime.Now.AddDays(-30)
GROUP BY userId,createdTime.Minute/5;
#result2= SELECT userId,COUNT(userId) AS TotalCount
FROM #result
GROUP BY userId;
OUTPUT #result2
TO "/datalake/output/data.csv"
USING Outputters.Csv();
I have a table containing entries with date and time. I try to create a NamedQuery which only compares the date part.
#NamedQuery(name = "Vote.findForDate", query = "SELECT v FROM Vote v WHERE v.createdAt = :date")
...
createNamedQuery("Vote.findForDate").setParameter("date", date, TemporalType.DATE).getResultList();
But it seems that it always tries to compare the whole datetime.
Is there no way without using date() function in SQL?
I try to be independent from the database. For example h2 has no date() function.
One possible solution is the usage of date as column type and reduce the information.
#Column(name = "voteDate")
#Temporal(value = TemporalType.DATE)
private Date voteDate;
I want to create a table in SQLite in which one of the field is for date, in which date and time of current instance should save. Which data type should I use?
I'm planning to use 'timestamp'. How to insert current timestamp value to the field? Also how to write content values for this date field?
SQLite supports the standard SQL variables CURRENT_DATE, CURRENT_TIME, and CURRENT_TIMESTAMP:
INSERT INTO Date (LastModifiedTime) VALUES(CURRENT_TIMESTAMP)
The default data type for dates/times in SQLite is TEXT.
ContentValues do not allow to use generic SQL expressions, only fixed values, so you have to read the current time in Java:
cv.put("LastModifiedTime",
new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date()));
INSERT INTO Date (LastModifiedTime) VALUES(DateTime('now'))
Use this site for further reference.
To get the current local(system) time, add the 'localtime' option:
select datetime('now', 'localtime');
I'm using timestamps a lot in my app. For me the best way to keep the timestamp is to convert it in milliseconds. After that it is easy to convert it to any locale.
If you need the current time use System.currentTimeMillis().
Content values are easy to use, you just and field and value, like:
ContentValues ins_reminder = new ContentValues();
ins_reminder.put("REMIND_TIMESTAMP", System.currentTimeMillis());
Since SQLite 3.38.0, there is a unixepoch() function that returns UNIX timestamp in integer. Does the same thing as strftime('%s').
References:
release log draft
check-in
In my case i wanted to have a timestamp with fractions of a second.
The keyword CURRENT_TIMESTAMP has only a precision of YYYY-MM-DD HH:MM:SS (see docs DEFAULT clause).
The function strftime() can return fractions of a second
Example to use strftime() in an INSERT
INSERT INTO YourTable (TimeStamp)
VALUES (strftime('%Y-%m-%d %H:%M:%S:%s'))
Comparison of CURRENT_TIMESTAMP and strftime()
SELECT 'CURRENT_TIMESTAMP' as Timestamp_Command,
CURRENT_TIMESTAMP as TimeStamp_Precision,
'only seconds' as Timestamp_Comment
UNION ALL
SELECT 'strftime(%Y-%m-%d %H:%M:%S:%s)' as Timestamp_Command,
(strftime('%Y-%m-%d %H:%M:%S:%s')) as TimeStamp_Precision,
'with fraction of a second' as Timestamp_Comment
Example to use it in c#
The following is based on bulk insert in sqlite with ado.net
public static void InsertBulk(SqliteConnection connection)
{
connection.Open();
using (var transaction = connection.BeginTransaction())
{
var command = connection.CreateCommand();
command.CommandText =
#"INSERT INTO BulkInsertTable (CreatedOn, TimeStamp)
VALUES ($createdOn, strftime('%Y-%m-%d %H:%M:%S:%s'))";
var parameter3 = command.CreateParameter();
parameter3.ParameterName = "$createdOn";
command.Parameters.Add(parameter3);
// Insert a lot of data
// calling System.DateTime.Now outside the loop is faster
var universalTime = System.DateTime.Now.ToUniversalTime();
for (var i = 0; i < 15_000; i++)
{
parameter3.Value = System.DateTime.Now.ToUniversalTime();
// faster
// parameter3.Value = universalTime;
command.ExecuteNonQuery();
}
transaction.Commit();
}
connection.Close();
}
When I write this query
SELECT Convert(datetime,Convert(varchar,CAST(GETUTCDATE() AS DATE))+' '+
CONVERT(varchar, cast(meas_pain.datetime AS time))) FROM meas_pain
it works for me but when I use the same part in WHERE clause it gives error 'Conversion failed when converting date and/or time from character string.'
SELECT schedules.id
FROM meas_pain LEFT JOIN schedules ON schedules.id=meas_pain.schd_id
WHERE meas_pain.schd_id=9150 AND
Convert(datetime,(Convert(varchar,CAST(GETUTCDATE() AS DATE))+' '+
CONVERT(varchar, cast(meas_pain.datetime AS time)))) <
CONVERT(datetime,DATEADD(Minute,0,getutcdate()))
can anybody explain??
I am not sure why this error does not appear in your select statement, since I can reproduce the error using just
SET DATEFORMAT DMY;
SELECT CONVERT(DATETIME, CONVERT(VARCHAR,CAST(GETUTCDATE() AS DATE)))
Example of Error
You are relying on localised conversion settings, you should use explicit conversion, e.g.
SET DATEFORMAT DMY;
SELECT CONVERT(DATETIME, CONVERT(VARCHAR, CAST(GETUTCDATE() AS DATE), 111), 111)
By explicitly defining the date format to convert both to varchar and from varchar (111) you can avoid any implied conversions.
However, If your dates/times are stored as such there should be no need for all the conversion to and from varchar, this is just more chance for things to go wrong, and unnecessary work, you can simply add a time to a datetime. e.g.
DECLARE #Date1 DATETIME = DATEADD(HOUR, 1, GETUTCDATE()),
#Date2 DATETIME = DATEADD(DAY, 1, GETUTCDATE());
SELECT [Date1] = #Date1,
[Date2] = #Date2,
[Date1/Time2] = CAST(CAST(#Date1 AS DATE) AS DATETIME) +
CAST(#Date2 AS TIME);
From what I can gather from your query you are just trying to get results where the time of meas_pain.datetime is less that the current UTC time, regardless of date. So you should be able to simplify your query to just:
SELECT schedules.id
FROM meas_pain
LEFT JOIN schedules
ON schedules.id = meas_pain.schd_id
WHERE meas_pain.schd_id = 9150
AND CAST(meas_pain.[DateTime] AS TIME) < CAST(GETUTCDATE() AS TIME);
And remove further redundant conversions.
Simplified example on SQL Fiddle
ADENDUM
Apparently this time comparison is not what you are after (although it is what the query you have posted is doing), so I am assuming GETUTCDATE() is just for demonstration.
The conversion you are trying to perform is equivalent to this:
CAST(CAST(GETUTCDATE() AS DATE) AS DATETIME) + CAST(meas_pain.[DateTime] AS TIME)
Another example on SQL Fiddle using the above conversion