Question

I have “users”

user_id usr_name email
1       john     [e-mail]
2       mike     [e-mail] 
3       tom      [e-mail]

table “positions”

pod_id   pos_name      magic_id email
1        carpenter       22     [e-mail] 
2        driver          33
3        guard           44     [e-mail]
4        cleaner         55     [e-mail]
5        accountant      66

now in table users i create column “magic_id”

is there way to add it from table positions with single query?

e.g.

UPDATE users 
   LEFT JOIN positions on positions.email = users.email
      SET users.magic_id = positions.magic_id

will this work?

Answer 1

This works, as can be seen at this SQLFiddle link:

http://sqlfiddle.com/#!2/431a9/1

UPDATE users 
    LEFT OUTER JOIN positions ON 
        positions.email = users.email
SET 
    users.magic_id = positions.magic_id;