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Cross tab convert rows to columns

Last Modified: 2013-11-05
Hi experts,
I've a table with structure:
RoomID   Floor   RoomNo
1               1           P101
2               1           P102
3               2           P201
4               2           P202
5               2           P203

Now I want my query return something like this (a floor has 4 rooms maximum)
Floor     Room1     Room2      Room3     Room4
1            P101         P102        NULL        NULL
2            P201         P202         P203        NULL

Really appriciate
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