Can we do data slicing in apex.

Question

Hello,
I've got very interesting requirement, but m unable to figure out the solution.
I have a table in which data is stored in such a way as shown in figure(1) below. In Apex report I have to show it like as in Figure(2).
Please help if anybody has solution, either within the apex or some special SQL is required to get the data.
Figure(1)
Col1     Col2     Col3     Col4
A X U W
B Y
C
D
Z
E V
Figure(2)
Col1     Col2     Col3     Col4
A X U W
B Y V
C Z
D
E

Answer 1

Data got distorted in editor, I am posting new figures with space replacing it with hyphen
Col1     Col2     Col3     Col4
A--------X-------U-------W--
B--------Y------------------
C---------------------------
D---------------------------
---------Z------------------
E----------------V----------
Col1     Col2     Col3     Col4
A--------X-------U-------W--
B--------Y-------V----------
C--------Z------------------
D---------------------------
E---------------------------