With a SELECT…WHERE id IN (…), order results by IN()? [duplicate]

问题

This question already has answers here:

Closed 9 years ago.

Possible Duplicate:
Ordering by the order of values in a SQL IN() clause

With a query such as:

SELECT * FROM images WHERE id IN (12,9,15,3,1)

is it possible to order the results by the contents of the IN clause?

The result I'm looking for would be something like:

[0] => Array
    (
        [id] => 12
        [file_name] => foo
    )   
[1] => Array
    (
        [id] => 9
        [file_name] => bar
    )   
[2] => Array
    (
        [id] => 15
        [file_name] => baz
    )
...

回答1:

The IN clause defines a set, and a set in mathematics has no order.

However there seems to be a workaround for MySQL by using the FIELD() function:

• Ordering by the order of values in a SQL IN() clause

来源：https://stackoverflow.com/questions/2435986/with-a-select-where-id-in-order-results-by-in