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Ranking in MySQL results

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A friend of me asked me long time ago: "How can I have a ranking on a result with MySQL?". Now I found some time to write it down:

Lets do first some preparation for the example:

CREATE TABLE sales (
  id     INT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY
, fruit  VARCHAR(32)
, amount DECIMAL
);

INSERT INTO sales
VALUES (NULL, 'apple', 12.75), (NULL, 'orange', 1.89), (NULL, 'pear', 19.23)
     , (NULL, 'banana', 4.25), (NULL, 'cherry', 123.75), (NULL, 'plum', 23.15)
;

Now lets query:

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