Access null check

Easy to follow. No jargon. Pictures helped. Didn't match my screen. Incorrect instructions. Too technical. Not enough information. Not enough pictures. And credit for the answer. Thank you for the quick and correct response. IIf IsNull GordThompson - why do you say 'more traditional'? But like I said, "If it works Sign up or log in Sign up using Google.

Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Lets look at below example, In here, we have declared an Employee class.

We are accessing employee property by doing a null check using Conditional operator? Lets, re-write above statements using null-conditional operator?. In the above example, we are using null-conditional operator?. The usage of null-conditional operator?. In below example, we have created an Employee instance as emp and set emp.

Age property value to We have set emp. You can see in the out put window, we are able to fetch Name and Age property value correctly using, However Address properties are displayed as empty.

Lets see why this happened here? Name and emp? Age evaluated to valid values. In case of emp. City , emp? State , emp? Country and emp? For example, In below case, Age property is a value type and emp?. In 3, you learned that Null doesn't equal anything. That's true, as long as you're using native functions and VBA.

For instance, the following statement executed against an ADO Recordset object returns an error:. That's because ADO doesn't recognize the Is operator in this context.

The ADO library supports the Equals and Inequality operators when searching for or excluding null values. Fortunately, the correction is as simple as replacing the Is operator with the Equals operator:. You'll find Access a bit of an oddball on this issue. Many libraries use the Equals and Inequality operators instead of Is. If a non-native library returns an error when working with null values, this switch will probably do the trick.

Not all aggregate functions consider null values. The good news is, there's a bit of reason to the inconsistency. An aggregate function that evaluates a field does not evaluate null values in its result. However, Count , First , and Last do evaluate null values. It makes sense that they would--just because one field contains a null value doesn't negate the row's purpose within the context of the domain.

If you want to exclude null values in a count, specify the field in the form Count field. The result of both forms may or may not be the same. The point is, the field-specific form won't consider null values in its count.

Otherwise, Jet excludes the row from the results. This behavior is inherent in the equality issue discussed in 3. Because Null doesn't equal anything, it can't satisfy a condition other than Is Null. For instance, the simple expression. Now, that might be what you want, but it might not. If you want to include null values, include Is Null in the condition as follows:.