Converting Rows Into Columns And Updating A Table?

I have a table A, whose table structure is in the below format.

Table A

ID DESC VALUE
123 A 454
123 B 1111
123 C 111
123 D 222
124 A 123
124 B 1
124 C 111
124 D 44

Now i need to insert the data from this table to another table B, the sturcture of which is as below

Table B

ID A B C D
1234541111111222
124123111144

How do i frame a query to fetch data from table A and insert that into table B? I don't want to use max and decode combination. as it would return only single row for an ID. I need all the id's to be displayed.