My exercise is:
The actor HARPO WILLIAMS was accidentally entered in the actor table as GROUCHO WILLIAMS. Write a query to fix the record.
so I am trying to query it by:
update actor
set actor.first_name = 'HARPO'
where actor_id in (
select actor.actor_id from actor
where concat(actor.first_name, ' ', actor.last_name) = 'GROUCHO WILLIAMS'
);
unfortunately error is thrown
You can't specify target table 'actor' for update in FORM clause
How can I fix that?
You don't need subquery for this; just match the first_name and last_name separately to get the row to update. Following query can also utilize the benefit of composite index (first_name, last_name)
(if defined) on the actor
table:
update actor
set actor.first_name = 'HARPO'
where actor.first_name = 'GROUCHO'
AND actor.last_name = 'WILLIAMS'
Dont use subquery for this, you can use simple update or else like this,
UPDATE actor AS s, (SELECT id FROM actor WHERE fname='GROUCHO' AND lname = 'WILLIAMS') AS p
SET s.fname = 'HARPO'
WHERE s.id = p.id;
DB FIDDLE LINK: https://dbfiddle.uk/?rdbms=mysql_8.0&fiddle=5ceb8e0d5d5837ce2ec13f18bfd103b2
Just match the first name and the last names seperately to update the row. I don't think the subquery is important.
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