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Foreign key constraints
Actions Constraint properties Column Creating a foreign key over a non-indexed column would automatically create an index on it. Alternatively, you can define an index below, before creating the foreign key. Foreign key constraint (INNODB)
Database Table Column
ON DELETE ON UPDATE
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Internal relationships Documentation
Column Internal relation An internal relation is not necessary when a corresponding FOREIGN KEY relation exists.
id
email_id
type
auth_bk
auth_id
active
host
port
folder
protocol
encryption
fetchfreq
fetchmax
postfetch
archivefolder
allow_spoofing
num_errors
last_error_msg
last_error
last_activity
created
updated