Possible Duplicate:
Column padding in tables
How do I adjust the padding in a table, meaning the distance between cell content and cell border? And how do I allow normal text flow so line breaks are added automatically, so the table doesn't stretch over the margin?
These margin/padding problems are illustrated in the figure:

arraystretchto adjust spacing between rows,@{}construct to change column spacing and delimiters,p-columns to make column fixed width. If you can provide an example working code, it will be easier to help. – mythealias Nov 26 '12 at 10:30