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25 lut 2016 · SELECT h.ClientNumber, IIf(h.CheckoutDate=null,"Yes","") AS CurrentVisitor FROM VisitsTable AS h INNER JOIN ( SELECT ClientNumber, MAX(LastVisitDate) AS LastVisitStart FROM VisitsTable GROUP BY ClientNumber) AS t ON (h.LastVisitStart = t.LastVisitStart) AND (h.ClientNumber = t.ClientNumber);
17 mar 2022 · If DateOfIssue is Null then use DateOfExpectedIssue. if DateOfIssue is Not Null then use DateOfIssue. I have tried to modify but not sure if the following logic is correct: Nz ( [DateOfIssue],0) since not sure if a date can have a 0 value.
This criterion applies to a Date/Time field, such as BirthDate. Only records where the number of years between a person's birthdate and today's date is greater than 30 are included in the query result. Is Null. This criterion can be applied to any type of field to show records where the field value is null.
17 lis 2015 · If you're checking whether or not the value is NULL, there is no need to convert it to a date, unless you wanted to return a date value (which you don't seem to). Instead, use: SELECT ISNULL( DOB , '') Which will return '' if the value is NULL. A NULL date is NULL (no value).
Trying to insert a NULL value into a field is always problematic, especially for date fields. Best to use a variable for the SQL statement, in my experience. Then, if the date is null, the SQL won't even try to insert a null value. Otherwise, just use the full SQL string for all three fields.
12 paź 2006 · use Is Null and Not Is Null, respectively, in criteria expressions and SQL WHERE clauses. For instance, to find null values in a query, you’d enter Is Null in the appropriate field’s Criteria...
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.
