如何在vb.net中使用Switch语句访问数据库

Question

I'm trying to SELECT the highest date value from 2 field as a variable then use it in WHERE This is my query

SELECT Some_ID, Stuff_Name, Bla_number, Something_Else, SWITCH(Review_date > Revised_date, Review_date, Revised_date > Review_date, Revised_date) AS MaximumDate 
FROM DocList 
WHERE (MaximumDate >= CDATE('01/01/1990')) AND (MaximumDate <= CDATE('01/01/2011'))

I get the error No value given for one or more required parameters.

Answer 1

You have another typo, or it doesn't know what MaximumDate is:

SELECT 
   Some_ID, 
   Stuff_Name, 
   Bla_number, 
   Something_Else, 
   DateAdd("yyyy", 2, IIf(Review_date > Revised_date, Review_date, Revised_date)) AS MaximumDate 
FROM 
   DocList 
WHERE 
   IIf(Review_date > Revised_date, Review_date, Revised_date)
       Between #01/01/1990# AND #01/01/2011#