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Column count of mysql.db is wrong. Expected 22, found 20. The table is probably

아래와 같은 에러를 확인할때
[ERROR] Column count of mysql.db is wrong. Expected 22, found 20. The table is probably corrupted
[ERROR] mysql.user has no `Event_priv` column at position 29
[ERROR] Event Scheduler: An error occurred when initializing system tables. Disabling the Event Scheduler.
 
mysql_upgrade –force -uroot -p [your mysql root password]
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