to sum values in same row

I need help , i want to have a column which will sum some values.
Example right now i have:
	ID	Column_1	Column_2
	1	   a	   	   3
	2	   b	   	   2
	2	   b	   	   1
	2	   b	   	   5
	3	   a	   	   1
	3	   a	   	   11
	4	   c	   	   45
	5	   d	   	   5

I want to have:
	ID	Column_1	Column_2
	1	   a	   	   3
	2	   b	   	   8
	3	   a	   	   12
	4	   c	   	   45
	5	   d	   	   5

I dont want to have total in another row, i want to have all data about each ID in one row.

Any chance to make it?