How to update multiple rows at once in MySQL?

You have a table students with id, score1, and score2 like this, where id is the primary key:

id	score1	score2
1	10	9
2	8	3
3	10	6
4	4	8

And here is the new table of data that you want to update to:

id	score1	score2
1	5	8
2	10	8
3	8	3
4	10	7

There are a couple of ways to do it.

1. You can either write multiple UPDATE queries like this and run them all at once:

UPDATE students SET score1 = 5, score2 = 8 WHERE id = 1;
UPDATE students SET score1 = 10, score2 = 8 WHERE id = 2;
UPDATE students SET score1 = 8, score2 = 3 WHERE id = 3;
UPDATE students SET score1 = 10, score2 = 7 WHERE id = 4;

2. Or you can UPDATE with JOIN statement:

UPDATE students s
JOIN (
    SELECT 1 as id, 5 as new_score1, 8 as new_score2
    UNION ALL
    SELECT 2, 10, 8
    UNION ALL
    SELECT 3, 8, 3
    UNION ALL
    SELECT 4, 10, 7
) vals ON s.id = vals.id
SET score1 = new_score1, score2 = new_score2;

3. Or you can use INSERT ... ON DUPLICATE KEY UPDATE

INSERT INTO students 
    (id, score1, score2)
    VALUES 
        (1, 5, 8),
        (2, 10, 8),
        (3, 8, 3),
        (4, 10, 7)
    ON DUPLICATE KEY UPDATE 
        score1 = VALUES(score1),
    score2 = VALUES(score2);

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