sql query

Question

Dear sir

I have two sql table Table1 and Table2 which have the following data

Table1

ID	ItemName	Quantity
1	Collar	100
2	freeze	200
3	collar	400
4	freeze	200
5	tv	200
6	tv	500

Table2

ID	ItemName	Quantity
1	Collar	70
2	collar	60
3	tv	200
4	freeze	50
5	tv	90
6	freeze	300

I want to find the difference of Sum of Quantity of both tables. And want to calculate like

Result

ItemName	Quantity
Collar	370
freeze	50
tv	410

Please help to execute sql query for solving this problem

Thanks advance