Question

I want to update the last generated row (the max(id) row.

I tried this code but it doesn’t work

update person t1
set t1.age = 25
where t1.id = (select max(t2.id)  from person t2
            where t2.address = 'LA, California');

MySQL tells me that : Error Code: 1093. You can't specify target table 't1' for update in FROM clause

So, I suppose that I cannot reach the same tale while performing operations such as updates.

How can I sole this problem ?

Regards.

Answer 1

You can try as:

UPDATE person t1
    INNER JOIN (SELECT MAX(id) AS id  FROM person
            WHERE t2.address = 'LA, California') t2
        ON t1.id = t2.id
SET t1.age = 25;

or

SELECT MAX(t2.id)
INTO @var_max_id
FROM person t2
WHERE t2.address = 'LA, California';

UPDATE person t1
SET t1.age = 25
WHERE t1.id = IFNULL(@var_max_id, -1);