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Handling A NULL Datetime In DATEDIFF()


 I want to select records where AnswerDate is within 30 days of today, and include records that have a NULL AnswerDate.

How can I tell DATEDIFF to treat NULL as Today?  (I think I am looking for something like VBA's nz() function.) 

 

SELECT RegistrationID ,  

AnswerDate, 

(DATEDIFF(dd,AnswerDate,GETUTCDATE())) AS InvitationAge

FROM Registration

WHERE (DATEDIFF(dd,AnswerDate,GETUTCDATE())) <= 30

 

Thanks


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I'm importing data form an Excel file to a Sql Server Database. Some of the data imported represents time as a double type so i convert the times into DateTime to be inserted into the database. The time values that aren't available in the Excel file are 0.. so what i want to do is insert null into the database for all the values that are 0 in the excel file... How do i do that based on this code i have so far:protected void ButtonImport_Click(object sender, EventArgs e){PanelUpload.Visible = false;PanelView.Visible = false;PanelImport.Visible = true;LabelImport.Text = "";OleDbCommand objCommand = new OleDbCommand();objCommand = ExcelConnection(); OleDbDataReader reader;reader = objCommand.ExecuteReader(); while (reader.Read()){DateTime? in_1 = null;DateTime? out_1 = null;DateTime? in_2 = null;DateTime? out_2 = null;   int emp_id = Convert.ToInt32(reader["emp_id"]);DateTime date_entry = Convert.ToDateTime(reader["date_entry"]);if (Convert.ToDouble(reader["in_1"]) != 0)in_1 = ConvertDoubleToDateTime((double)reader["in_1"]);if (Convert.ToDouble(reader["out_1"]) != 0)out_1 = ConvertDoubleToDateTime((double)reader["out_1"]);if (Convert.ToDouble(reader["in_2"]) != 0)in_2 = ConvertDoubleToDateTime((double)reader["in_2"]);if (Convert.ToDouble(reader["out_2"]) != 0)out_2 = ConvertDoubleToDateTime((double)reader["out_2"]); ImportIntoAttendance(emp_id, date_entry, in_1, out_1, in_2, out_2);} reader.Close();}protected void ImportIntoAttendance(int emp_id, DateTime date_entry, DateTime? in_1, DateTime? out_1, DateTime? in_2, DateTime? out_2){ SqlDataSource AttendanceDataSource = new SqlDataSource();AttendanceDataSource.ConnectionString = ConfigurationManager.ConnectionStrings["SalariesConnectionString1"].ToString();AttendanceDataSource.InsertCommandType = SqlDataSourceCommandType.Text;AttendanceDataSource.InsertCommand = "INSERT INTO Attendance (emp_id, date_entry, in_1, out_1, in_2, out_2) " +"VALUES ('" + emp_id + "', '" + date_entry + "', '" + in_1 + "', '" + out_1 + "', " +"'" + in_2 + "', '" + out_2 + "')"; int rowsAffected = 0;try{rowsAffected = AttendanceDataSource.Insert();}catch(Exception ex){LabelImport.Text += "<font color=red>" + ex + "</font><br />";} }private DateTime ConvertDoubleToDateTime(double dbTime){string[] SplitTime = dbTime.ToString().Split('.');string hours = SplitTime[0];string minutes = String.Empty;string time = String.Empty; if (dbTime.ToString().IndexOf('.') != -1){if (SplitTime[1].Length >= 1){if (SplitTime[1].Length == 1)minutes = Convert.ToString(Convert.ToDouble(SplitTime[1]) * 10);else if (SplitTime[1].Length > 1)minutes = SplitTime[1];}}elseminutes = "00";time = hours + ":" + minutes;return Convert.ToDateTime(time);}

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Seeking Correct Syntax To Pass A NULL Value For A Datetime Field From An Asp Page To SQL
Hello,I've been searching the web for quite some time to resolve the problemof "1/1/1900" returning in a datetime field in SQL that resulted from ablank (not NULL) value being passed to it through an ASP page.The solution is that a NULL value needs to passed to SQL from ASP.Thats fine...I understand the why the problem is happening and thesolution around it. HOWEVER, I can't seem to get the proper syntax towork in the ASP page. It seems no matter what I try the "1/1/1900"still results. Below are a few variations of the code that I havetried, with the key part being the first section. Does anyone have anysuggestions?!?!?______________cDateClosed = ""If(Request.Form("dateClosed")= "") ThencDateClosed = (NULL)end ifsql="UPDATE rfa SET "&_"dateClosed='"& cDateClosed &"', "&_"where rfaId='"& Request.Form("RFAID")&"'"_____________________________cDateClosed = ""If(Request.Form("dateClosed") <> "") ThencDateClosed = (NULL)end ifsql="UPDATE rfa SET "&_"dateClosed='"& cDateClosed &"', "&_"where rfaId='"& Request.Form("RFAID")&"'"_____________________________cDateClosed = ""If(Request.Form("dateClosed")= "") ThencDateClosed = NULLend ifsql="UPDATE rfa SET "&_"dateClosed='"& cDateClosed &"', "&_"where rfaId='"& Request.Form("RFAID")&"'"_______________Thanks in advance!!!!

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Problem With Isnull. Need To Substitute Null If A Var Is Null And Compare It To Null And Return True
Hey. I need to substitute a value from a table if the input var is null. This is fine if the value coming from tableis not null. But, it the table value is also null, it doesn't work. The problem I'm getting is in the isnull line which is in Dark green color because @inFileVersion is set to null explicitly and when the isnull function evaluates, value returned from DR.FileVersion is also null which is correct. I want the null=null to return true which is why i set ansi_nulls off. But it doesn't return anything. And the select statement should return something but in my case it returns null. If I comment the isnull statements in the where clause, everything works fine. Please tell me what am I doing wrong. Is it possible to do this without setting the ansi_nulls to off??? Thank you

set ansi_nulls off


go

declare

@inFileName VARCHAR (100),

@inFileSize INT,

@Id int,

@inlanguageid INT,

@inFileVersion VARCHAR (100),

@ExeState int

set @inFileName = 'A0006337.EXE'

set @inFileSize = 28796

set @Id= 1

set @inlanguageid =null

set @inFileVersion =NULL

set @ExeState =0

select Dr.StateID fromtable1 dR

where

DR.[FileName] = @inFileName

AND DR.FileSize =@inFileSize

AND DR.FileVersion = isnull(@inFileVersion,DR.FileVersion)

AND DR.languageid = isnull(@inlanguageid,null)

AND DR.[ID]= @ID

)

go

set ansi_nulls on

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Null Values For Datetime Values Converted To '0001-01-01'
Hi

can somebody explain me how I can assign aNULL value to a datetime type field in the script transformation editor in a data flow task.
In the script hereunder,Row.Datum1_IsNull is true, but still Row.OutputDatum1 will be assigned a value '0001-01-01' which generates an error (not a valid datetime). All alternatives known to me (CDate("") or Convert.ToDateTime("") or Convert.ToDateTime(System.DBNull.Value)) were not successful.
Leaving outthe ELSE clause generates following error: Error: Year, Month, and Day parameters describe an un-representable DateTime.




If Not Row.Datum1_IsNull Then

Row.OutputDatum1 = Row.Datum1

Else

Row.OutputDatum1 = CDate(System.Convert.DBNull)

End If



Any help welcome.

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DateDiff
I'm using a datediff(mi, start, stop) to get the duration of an operation. i want it displayed in HH:MM format. can anyone help me w/ a way to do that????



tia,
e3witt

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Datediff Or MAX?
Hello,

My string is:

SELECT weight FROM progress WHERE dateInput = (SELECT MAX(dateInput) FROM progress) AND memberID = 1

The problem is that the MAX dateInput doesn't belongs to memberID 1. It belongs to memberID 2. What I want is that I wanna choose the MAX Date of memberID 1. I thought of maybe using datadiff function. But I don't know how to make the datediff statement. Maybe I can write the datediff statement whereby the least datediff between the dateInput and getdate() will be the row I want. I really appreciate the person that helps me this problem... Thanks 1st of all!

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DateDiff
I am trying to select records from whatever the current date would be and 12 months before whatever the current date is. How would I go about doing this. The table that I am trying to do this with has a year column and a month column.

I was playing with the date diff function, but I can only get dates from the specified date range. I need it to be where if I run it tomorrow, it will get that day and everything within the last 12 months.

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Datediff
If I wanted to get everyone DOB who is over 18 how would I do that? I am currently trying something like this, but no luck...


Declare @todays_date datetime

Select from person
CASE
WHEN dateadd(year, datediff (year, Date_Of_Birth, @Todays_Date), Date_Of_Birth) > @Todays_Date -- Date of Birth check
THEN datediff (year, Date_Of_Birth, @Todays_Date) - 1
ELSE datediff (year, Date_Of_Birth, @Todays_Date)
END
>= 18

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SELECT DATEDIFF(mm,0,'01/25/2008')
Returns 1296 what does it represent...

Thanks

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Hi,
I have a Table Where I have Two Date columns and I want to find the Differnce in the 3rd column.ie DateReceived - AsOnDate = NoofDays.I tried this code
SELECT SRNO,CONVERT (VARCHAR,AsonDate,102)as ASONDATE,CONVERT(VARCHAR, DateReceived, 102) AS DateReceived,CONVERT(VARCHAR, DateAcknowledged, 102) AS NoofDays,
sum(CASE WHEN DATEDIFF(DAY, DATERECEIVED,ASONDATE, GETDATE())
FROM Details


Plz help me...

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Hi there i am using the datediff funtion but it does not seem to be inclusive of the two dates eg
SELECT DATEDIFF(day, s_Date, e_date) AS NumberOfDays,*
FROM weekendtest

i know i could do
SELECT DATEDIFF(day, s_Date, e_date)+1 AS NumberOfDays,*
FROM weekendtest

but i was just wondering if there some other function i should use that would be more appropriate

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Hi
I've a problem!!!
i want to use datediff thats no problem. But the first parameter has to
be parameterised. What datatype do i declare it as. i declare it as varchar
it returns me an error : Invalid parameter 1 specified for datediff.

i'm doing this in a stored procedure.

Is there a way out or do i've to use the good old 'IF' or 'Case' ?



regards
pradeep

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DATEDIFF?
I need to get a listing of all persons who are atleast 18 years of age. A date of birth field in the database is in this format:

4/25/2008 12:00:00 AM

My solution would be where the difference between the current date and the dob is >= 18.

I tried...

select * from table where datediff(yy,dob,getdate)) >= 18.

But this only seems to subtract the years and ignore the days/months, which I need. Could anyone provide the syntax I need?

Help is appreciated. Thanks.

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Could somebody please explain to me why I get the following results:


select datepart (ww, '10/02/08') --returns 6

select datepart (ww, '18/02/08') --returns 8

select datediff (ww, '10/02/08', '18/02/08') -- returns 1

I was expecting the third query to return 2.

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Hi,
I'm inserting a datetime values into sql server 2000 from c#

SQL server table details
Table nameate_test
columnname datatype
No int
date_t DateTime

C# coding
SqlConnection connectionToDatabase = new SqlConnection("Data Source=.\SQLEXPRESS;Initial Catalog=testdb;Integrated Security=SSPI");
connectionToDatabase.Open();
DataTable dt1 = new DataTable();
dt1.Columns.Add("no",typeof(System.Int16));
dt1.Columns.Add("date_t", typeof(System.DateTime));
DataRow dr = dt1.NewRow();
dr["no"] = 1;
dr["date_t"] = DateTime.Now;
dt1.Rows.Add(dr);
for(int i=0;i<dt1.Rows.Count;i++)
{
string str=dt1.Rows["no"].ToString();
DateTime dt=(DateTime)dt1.Rows["date_t"];
string insertQuery = "insert into date_test values(" + str + ",'" + dt + "')";
SqlCommand cmd = new SqlCommand(insertQuery, connectionToDatabase);
cmd.ExecuteNonQuery();
MessageBox.Show("saved");
}
When I run the above code, data is inserted into the table
The value in the date_t column is 2007-07-09 22:10:11 000.The milliseconds value is always 000 only.I need the millisecond values also in date_t column.
Is there any conversion needed for millisecond values?

thanks,
Mani

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I'm getting error:
String was not recognized as a valid DateTime.
my insert parameter: 
<asp:Parameter Name="LastModified" Type="DateTime" DefaultValue= "<%=DateTime.Now.ToString() %>"
my insert command:
InsertCommand="INSERT INTO [Product] ([Enabled], [ProductCode], [ProductName], [ProductAlias], [CarrierId], [DfltPlanId], [DoubleRating], [DoubleRateProductId], [ConnCharges], [StartDate], [EndDate], [Contracted], [BaseProductId], [LastModified], [LastUser]) VALUES (@Enabled, @ProductCode, @ProductName, @ProductAlias, @CarrierId, @DfltPlanId, @DoubleRating, @DoubleRateProductId, @ConnCharges, @StartDate, @EndDate, @Contracted, @BaseProductId, @LastModified, @LastUser)"
LastModified is a datetime field.
 Running sql2005

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I'm trying to include a DATEDIFF compare in my Where clause, but it seems to ignore the comparison I'm trying to invoke, and just returns all  rows.  When I display the result of the DATEDIFF  command, it looks good, but I can't seem to have it incorporated in my Where clause.
The following is my code -
 select [Pkg ID], [Elm (s)], [Type Name (s)], [End Exec Date], [End Exec Time]
from pkgactions
WHERE (8 > DateDiff(year, [End Exec Date], GetDate() ))
order by [pkg id]
 
Thanks

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