Checking Query in SQL

Question

I have a table called Attendance

Atn_No int

Atn_Date date

Atn_EmpNo varchar

I have another table Called Operation

Opn_No int

OPn_StartDate date

Opn_EndDate date

Opn_Activity varchar

Opn_ActivityHour int

What i want to check with Operation with the help Start & End Date Who's employees was working on that operation

Below is Operation Table DATA

Opn_StartDate	Opn_EndDate	Opn_Activity	Opn_ActivityHour
01-01-2016	03-01-2016	ABC	1
04-01-2016	06-01-2016	XYZ	2
07-01-2016	08-01-2016	LMN	3

Below Attendance Table DATA

Atn_No	Atn_Date	Atn_EmpNo
Atn-1	02-01-2016	A-1
Atn-2	02-01-2016	A-2
Atn_3	05-01-2016	A-3

Thanks

Basit.