[Konstantinos]

It's a good tutorial. It'd be nice if you used ID for each player and use orm_setkey function as well. When a player disconnects, orm_update should be used so it will update the row of that player.

Something last:

pawn Code:

// OnPlayerMysqlFinish:
    if(cache_num_rows() == 1)
    {
        new ORM:ormid = PlayerInfo[playerid][pORM_ID] = orm_create("accounts");

        orm_addvar_string(ormid, PlayerInfo[playerid][pPassword], 128, "Password");
        orm_addvar_int(ormid, PlayerInfo[playerid][pKills], "Kills");
        orm_addvar_int(ormid, PlayerInfo[playerid][pDeaths], "Deaths");
        orm_addvar_int(ormid, PlayerInfo[playerid][pMoney], "Money");

        orm_apply_cache();
        
        ShowPlayerDialog(playerid, DIALOG_ACCOUNT_LOGIN, DIALOG_STYLE_PASSWORD, "Welcome to my server", "Please insert your password down below.", "Login", "Exit");
    }
    else if(!cache_num_rows())
    {
        ShowPlayerDialog(playerid, DIALOG_ACCOUNT_REGISTER, DIALOG_STYLE_PASSWORD, "Welcome to my server", "Please insert your password down below\nNotice! You'll need to save it to login under this account.", "Register", "Exit");
    }
    else {}

It can become:

pawn Code:

if(cache_num_rows())
{
    new ORM:ormid = PlayerInfo[playerid][pORM_ID] = orm_create("accounts");
    
    orm_addvar_string(ormid, PlayerInfo[playerid][pPassword], 128, "Password");
    orm_addvar_int(ormid, PlayerInfo[playerid][pKills], "Kills");
    orm_addvar_int(ormid, PlayerInfo[playerid][pDeaths], "Deaths");
    orm_addvar_int(ormid, PlayerInfo[playerid][pMoney], "Money");
    
    orm_apply_cache();
    
    ShowPlayerDialog(playerid, DIALOG_ACCOUNT_LOGIN, DIALOG_STYLE_PASSWORD, "Welcome to my server", "Please insert your password down below.", "Login", "Exit");
}
else ShowPlayerDialog(playerid, DIALOG_ACCOUNT_REGISTER, DIALOG_STYLE_PASSWORD, "Welcome to my server", "Please insert your password down below\nNotice! You'll need to save it to login under this account.", "Register", "Exit");

Good effort though.