Let's Build a Simple Database

enum MetaCommandResult {                                                                                              
    Exit,                                                                                                             
    Success,                                                                                                          
    UnrecognizedCommand,                                                                                              
} 

enum Statement {                                                                                                      
    Insert,                                                                                                           
    Select,                                                                                                           
    Unrecognized(String),                                                                                             
}