Mysql: Swap data for different rows

Question

Suppose a table fruits that looks like this:

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| id |    name    |   color   | calories |
-------------         


        

Answer 1

Here's a way to store values temporarily without using a temp table or a dummy row in your fruit table:

SELECT name, color, calories FROM fruit WHERE id = 2 INTO @name, @color, @calories;

UPDATE fruit AS f1, fruit AS f2
SET
 f1.name = f2.name, f2.name = @name,
 f1.color = f2.color, f2.color = @color,
 f1.calories = f2.calories, f2.calories = @calories
WHERE (f1.id, f2.id) = (2, 5);

Here's another solution that uses a dummy id value:

UPDATE fruit SET id = 0 WHERE id = 5;
UPDATE fruit SET id = 5 WHERE id = 2;
UPDATE fruit SET id = 2 WHERE id = 0;