如果来自不同表的两个ID匹配，MySQL将特定值插入列中？

Question

I have 3 tables employees , managers , users . I want to insert value 1 into users column is_manager only if the id from employees matches id from managers . id is primary key in employees and primary and foreign key in managers .

Any help would be appreciated. Thanks

Answer 1

Either

UPDATE users 
INNER JOIN managers ON users.id=managers.id
SET users.is_manager=1

or

UPDATE users SET is_manager=1
WHERE id IN (
  SELECT id FROM managers
)

will do. I recommend the latter for better readability.