>>Sir you used your following codes
>>
>>

>>SELECT Date, DatePart(hour,Date) as Hr, reading
>>FROM bin1_empty A
>>WHERE EXISTS( 
>>(SELECT Min(Date) as date_B
>>FROM bin1_empty B
>>WHERE DatePart(hour,A.Date) = DatePart(hour,B.Date) 
>>HAVING B.Date_B = A.Date)
>>OR EXISTS(
>>SELECT Min(Date) as date_C
>>FROM bin1 C
>>WHERE DatePart(hour,A.Date) = DatePart(hour,C.Date)
>>HAVING C.Date_C = A.Date)
>>

>>
>>but it has error shown in image.
>
>
>I think there was one ) too much:
>
>

>SELECT Date, DatePart(hour,Date) as Hr, reading
>FROM bin1_empty A
>WHERE EXISTS( 
>SELECT Min(Date) as date_B
>FROM bin1_empty B
>WHERE DatePart(hour,A.Date) = DatePart(hour,B.Date) 
>HAVING B.Date_B = A.Date)
>OR EXISTS(
>SELECT Min(Date) as date_C
>FROM bin1 C
>WHERE DatePart(hour,A.Date) = DatePart(hour,C.Date)
>HAVING C.Date_C = A.Date)
>

Sir it has still error like shown in image.