Natural Sort in MySQL

2018-12-31 05:24发布

Is there an elegant way to have performant, natural sorting in a MySQL database?

For example if I have this data set:

  • Final Fantasy
  • Final Fantasy 4
  • Final Fantasy 10
  • Final Fantasy 12
  • Final Fantasy 12: Chains of Promathia
  • Final Fantasy Adventure
  • Final Fantasy Origins
  • Final Fantasy Tactics

Any other elegant solution than to split up the games' names into their components

  • Title: "Final Fantasy"
  • Number: "12"
  • Subtitle: "Chains of Promathia"

to make sure that they come out in the right order? (10 after 4, not before 2).

Doing so is a pain in the a** because every now and then there's another game that breaks that mechanism of parsing the game title (e.g. "Warhammer 40,000", "James Bond 007")

19条回答
不再属于我。
2楼-- · 2018-12-31 06:30

A simplified non-udf version of the best response of @plaix/Richard Toth/Luke Hoggett, which works only for the first integer in the field, is

SELECT name,
LEAST(
    IFNULL(NULLIF(LOCATE('0', name), 0), ~0),
    IFNULL(NULLIF(LOCATE('1', name), 0), ~0),
    IFNULL(NULLIF(LOCATE('2', name), 0), ~0),
    IFNULL(NULLIF(LOCATE('3', name), 0), ~0),
    IFNULL(NULLIF(LOCATE('4', name), 0), ~0),
    IFNULL(NULLIF(LOCATE('5', name), 0), ~0),
    IFNULL(NULLIF(LOCATE('6', name), 0), ~0),
    IFNULL(NULLIF(LOCATE('7', name), 0), ~0),
    IFNULL(NULLIF(LOCATE('8', name), 0), ~0),
    IFNULL(NULLIF(LOCATE('9', name), 0), ~0)
) AS first_int
FROM table
ORDER BY IF(first_int = ~0, name, CONCAT(
    SUBSTR(name, 1, first_int - 1),
    LPAD(CAST(SUBSTR(name, first_int) AS UNSIGNED), LENGTH(~0), '0'),
    SUBSTR(name, first_int + LENGTH(CAST(SUBSTR(name, first_int) AS UNSIGNED)))
)) ASC
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