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Asked: 2026-05-10T21:22:57+00:00

Here is a simple scenario with table characters: CharacterName GameTime Gold Live Foo 10

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Here is a simple scenario with table characters:

CharacterName GameTime Gold Live Foo 10 100 3  Foo 20 100 2  Foo 30 95 2

How do I get this output for the query SELECT Gold, Live FROM characters WHERE name = 'Foo' ORDER BY GameTime:

Gold Live 100 3 0 -1 -5 0

using MySQL stored procedure (or query) if it’s even possible? I thought of using 2 arrays like how one would normally do in a server-side language, but MySQL doesn’t have array types.

While I’m aware it’s probably easier to do in PHP (my server-side langauge), I want to know if it’s possible to do in MySQL, just as a learning material.

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1 Answer

  1. One possible solution using a temporary table:

    CREATE TABLE characters_by_gametime (   id INTEGER AUTO_INCREMENT PRIMARY KEY,   gold INTEGER,   live INTEGER);  INSERT INTO characters_by_gametime (gold, live) SELECT gold, live FROM characters ORDER BY game_time;  SELECT   c1.id,   c1.gold - IFNULL(c2.gold, 0) AS gold,   c1.live - IFNULL(c2.live, 0) AS live FROM   characters_by_gametime c1   LEFT JOIN characters_by_gametime c2     ON c1.id = c2.id + 1 ORDER BY   c1.id;

    Of course Eoin’s solution is better if your id column follows the order you want in the output.

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