What is that * sign some select statements about?

It's called the splat operatorIt returns every column, or field, of a recordIt replaces any single character in a stringIt's called the LIKE operator

Sweet! * is the splat operator that we use to retrieve every column of a record in a table. While it's a wildcard, it doesn't replace characters in strings.

Close! * is the splat operator that we use to retrieve every column of a record in a table. While it's a wildcard, it doesn't replace characters in strings.