使用TableAdapter C＃[sql]计算两次之间的分钟数

Question

I want to calculate minutes between two times, I am generating method using TableAdapter.

I am trying with this

SELECT        
   name, signin, 
   DATEDIFF([minute], signin, [DateTime].Now) AS Expr1
FROM            
   Table1

This should calculate minute between the current time and the previous time

Answer 1

The correct text for this query should be

SELECT        
   name, signin, 
   DateDiff('n',signin,Now()) as MinuteDifference
FROM            
   Table1

To represent the difference in minutes to the DateDiff function you use the shortcut 'n' (between single quotes) and do not prefix the Now() function with the DateTime word. This is totally unknown to the Access Engine