q on numeric DATA-TYPES for columns of a table

Question

INT -A normal-sized integer that can be signed or unsigned. signed or unsigned MEANING????!! THANKS!

Answer 1

means it can store positive integer value as well as negative integer value

Answer 2

yeah that's right

Answer 3

no no wait signed means all the no s
but unsigned means only positive numbers
it is used when we have some values in positive terms only so in order to save memory we use unsigned , range of variable can be doubled by unsigned and writing signed or not will not make such difference

Answer 4

oh OK thanks a lot for that!

Do u mean that unsigned=0, and signed=either of a +ve or -ve value? So by saying, an integer value that can be signed or unsigned, they're really saying it can be literally ANY integer, whether it's +ve, -ve or even just 0. Is the right interpretation? THANKS :D