Problem using calculated expression within Dcount

Hello,

All help is appreciated, I'm struggling with the following.

Using Access 2003 (front end) connecting to Oracle 7 database (back end). I'm trying to create a query in access that will show how many instances of something happens.

Within the query I am using a calculated filed called "registered".The syntax is

Registered: DateDiff("w",[date_valid],[timestamp])

This returns a number 0.00, 1.00, 2.00 etc

Within the query or form (I've tried both), I'm trying to count the number times that 0.00 appears. I will then take this figure and use it to calculate the percentage. My problem is when using the dcount function to count the instances that something appears. I've tried the following

DCount("salary","Applications","registered=0.00")

This is where the errors start, I've also tried

DCount("salary","Applications","(DateDiff(""w"",[date_valid],[timestamp]))=1.00")

but this also errors with the same message. The error message always refers to "Start Date" which is one of the parameters of "date_valid" (the other being "End Date"). I've removed this parameter but it still asks for it.

Where am I going wrong?

re: Problem using calculated expression within Dcount

In a new query based on the first query ...
Mary

re: Problem using calculated expression within Dcount

Thanks for that, you have solved my problem, I didn't know about the IIF function.

Thanks again

re: Problem using calculated expression within Dcount

You're welcome.