mysql replace values in a table

Question

I have a users table in my mysql database with columns like id, age and gender. I have inserted around 500 records into it.

Now i need to interchange the gender for the records, i.e., replace male with female and female with male.

I thought to do it this way:

update users set gender='female' where gender='male';
update users set gender='male' where gender='female';

But as you can see, as soon as i run the first query, all the records will be updated with the gender set to 'female'.

How can i modify the query or shall i go another way?

Answer 1

update users set gender=case when gender='male' then 'female' else 'male' end where gender in ('male','female');