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25 lut 2016 · The following query is not returning values for CurrentVisitor in my ms access 2010 database: SELECT ClientNumber, MAX(LastVisitDate) AS LastVisitStart. FROM VisitsTable. GROUP BY ClientNumber) AS t. I think the reason is that the check for null in the If() operation is not written correctly.
18 gru 2013 · select if(isnull(date_field) or date_field = '1900-01-01 00:00:00', null, date_field) from table_name;
20 gru 2023 · Regarding "end dates" - Rather than using nulls or a ZLS, I used essentially an impossible date as the marker. When dealing with dates in Access, you can legally display any date from 1-Jan-100 to 31-Dec-9999.
10 lis 2012 · SELECT LightDuty.FDID, LightDuty.[First Name], LightDuty.[Last Name], LightDuty.Unit, LightDuty.[Permanent Assignment], LightDuty.[Drs Excuse Exp], LightDuty.[Email Address], LightDuty.[Email Sent Date] FROM LightDuty WHERE (((LightDuty.[Email Sent Date])=IsNull([Email Sent Date])) AND ((DateDiff('d',Date(),[Drs Excuse Exp]))=14));
2 lut 2012 · Here are some common date criteria examples, ranging from simple date filters to more complex date range calculations. Some of the more complex examples use Access date functions to extract different parts of a date to help you get just the results you want.
It would help if you provided the entire SQL statement. You should be able to use "OR Is Null" in your WHERE CLAUSE. Generically this might look like: SELECT * FROM tblYourTableName. WHERE Account_Number = Forms!YourForm!txtAcctNum . AND (Course_Date = Forms!YourForm!txtCourseDate OR Course_Date Is Null);
You can use the Nz function to return zero, a zero-length string (" "), or another specified value when a Variant is Null. For example, you can use this function to convert a Null value to another value and prevent it from propagating through an expression.
