How to display data with 3 columns using for loop

I have retrieved more than 50 rows from database, and i need to display that like below...
Data1    Data5       Data9   
Data2    Data6       Data10
Data3    Data7       Data11
Data4    Data8        Data12
.            .               .
.            .               .
.            .               .
.            .               .
Now i concatenate that values in a string variable using for loop.
...