How to sort the results of a ranking?

6

I'm developing a game, and in it I need to do a ranking according to the time it took the user to reach the end of the game.

My question is, what kind of data should I use in my database to be able to organize when displaying the ranking?

I have the time variable ex: "00:32:54" but it is a string, how do I get it organized in a ranking?

    
asked by Gabriel Longatti 15.09.2015 в 19:05

2 answers

6

You could use either TIME type or type INT or DOUBLE / FLOAT / NUMERIC (depending on the database). TIME (MySQL) implementation:

CREATE TABLE rankingbytime (
  id INT NOT NULL PRIMARY KEY AUTO_INCREMENT,
  nome VARCHAR(40),
  tempo TIME
);

INSERT INTO rankingbytime (nome, tempo) VALUES
('Fulano', '00:32:54'),
('Beltrano', '00:29:52'),
('Ciclano', '00:30:19'),
('Treuslano', '00:31:20'),
('Peuslano', '00:35:14');

SELECT id, nome, tempo FROM rankingbytime ORDER BY tempo ASC;

Output:

| id |      nome |                     tempo |
|----|-----------|---------------------------|
|  2 |  Beltrano | January, 01 1970 00:29:52 |
|  3 |   Ciclano | January, 01 1970 00:30:19 |
|  4 | Treuslano | January, 01 1970 00:31:20 |
|  1 |    Fulano | January, 01 1970 00:32:54 |
|  5 |  Peuslano | January, 01 1970 00:35:14 |

Implementing the FLOAT (MySQL) type:

CREATE TABLE rankingbyseconds (
  id INT NOT NULL PRIMARY KEY AUTO_INCREMENT,
  nome VARCHAR(40),
  tempo FLOAT(13,3)
);
INSERT INTO rankingbyseconds (nome, tempo) VALUES
('Fulano', 1974.523),
('Beltrano', 1792.584),
('Ciclano', 1819.287),
('Treuslano', 1880.518),
('Peuslano', 2114.261);

SELECT id, nome, tempo FROM rankingbyseconds ORDER BY tempo ASC;

Decimal float are the thousandths, if you use only seconds, you can use the INT field type by calculating only integers that would represent the number of seconds.

Output:

| id |      nome |    tempo |
|----|-----------|----------|
|  2 |  Beltrano | 1792.584 |
|  3 |   Ciclano | 1819.287 |
|  4 | Treuslano | 1880.518 |
|  1 |    Fulano | 1974.523 |
|  5 |  Peuslano | 2114.261 |

Examples Running in SQLFiddle

You can also use DATETIME type and save the start date and time, date and end time, this template is for you to search.

    
15.09.2015 / 19:45
4

I would use PHP to convert the time in seconds, and then only record the number in the database, can do a scoring system, example 1 second equals 3 points, lost a life -100 points, then multiply the seconds by 3 and add everything in the end.

Example of the function in PHP that converts time in seconds:

<?php 
function seconds_from_time($time) { 
    list($h, $m, $s) = explode(':', $time); 
    return ($h * 3600) + ($m * 60) + $s; 
} 

echo seconds_from_time("00:32:54");
    
15.09.2015 в 19:26