Yii2 - migration foreign key

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A FOREIGN KEY is a key used to link two tables together.

Syntax 
    
    $this->addForeignKey(name, table, column, referringTable, referringColumn, delete, update);
    // delete options: RESTRICT, CASCADE, NO ACTION, SET DEFAULT, SET NULL
    // update options: RESTRICT, CASCADE, NO ACTION, SET DEFAULT, SET NULL

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