Difference between varchar and char:
varchar are variable length strings with a maximum length specified. If a string is less than the maximum length, then it is stored verbatim without any extra characters.
char are fixed length strings with a set length specified. If a string is less than the set length, then it is padded with extra characters so that it's length is the set length.
Use varchar when your strings do not have a fixed length (e.g. names, cities, etc.)
Use char when your strings are always going to be the same length (e.g. phone numbers, zip codes, etc).
char are fixed length strings with a set length specified. If a string is less than the set length, then it is padded with extra characters so that it's length is the set length.
Use varchar when your strings do not have a fixed length (e.g. names, cities, etc.)
Use char when your strings are always going to be the same length (e.g. phone numbers, zip codes, etc).
