MySQL根据另一个表中同一行的另一个字段值的重复外观更新布尔值

Question

i have a table (inactive) like:

email (varchar 50), country, active? (2)

and another table (active) like:

email (varchar 50), country

i want to check if any of the addresses in email column at "active" is also in the "inactive" table and if so so it would update the "active?" column to: 0/1 or yes/no.

Answer 1

update test1
  inner join test2
  on test1.email = test2.email
  set test1.active = 1
 ;

Answer 2

Try this solution using UPDATE LEFT JOIN:

UPDATE  inactive i LEFT JOIN active a USING(email)
SET i.`active?` = 1
WHERE a.country IS NOT NULL