mysql - Query execution is taking too long -


I currently have two tables in a database Called emails in both unread and non-spoken tables have a column called Email I want to compare these two tables and wherever in the email matches I want to update the columns in the email table, which is called e-mail_status_id2 ... the query I am using is

< Pre> UPDATE email E SET E.Email_status_id = 2 where e-mails (U.S. U.S. Select this option);

I am currently using mysql

There are 2704569 rows of emails in the e-mail table and 12102 rows of emails in the table without any breaks

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The first thing is that Reminders (email) : 

  create index id_unsubscribed_email on allowed subscription (email); Or, better than that, declare it as the  primary key , especially if it is the only column in the table. 
 
 Then, MySQL sometimes performs a poor job of applying  in  There are several ways to write queries to use the index.  is present  is a specific method: 
 
  Update email and set up email_status_id = 2 where it is available (Select Unsubscribe U from where u.email = e.email );  
 
 The  included  version should have the same performance with the index. 
 
 Edit: 
 
 The query can also help with the email (email)  query For some reason, I assumed that it was already in the table Only important will be important.

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