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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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+ Add constraint
Internal relationships Documentation
Column Internal relation An internal relation is not necessary when a corresponding FOREIGN KEY relation exists.
id
course
name
intro
introformat
practice
modattempts
usepassword
password
dependency
conditions
grade
custom
ongoing
usemaxgrade
maxanswers
maxattempts
review
nextpagedefault
feedback
minquestions
maxpages
timelimit
retake
activitylink
mediafile
mediaheight
mediawidth
mediaclose
slideshow
width
height
bgcolor
displayleft
displayleftif
progressbar
available
deadline
timemodified
completionendreached
completiontimespent
allowofflineattempts