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â The Big Bang Theory. As the name implies, a Self-Insert Fic is one where the author has made a simulacrum of themselves, commonly called an avatar, in the story's world as a key character (usually The Protagonist, but any other role that's vital to the story qualifies).
What is Self Join in SQL? A self join is a join in which a table is joined with itself (which is also called Unary relationships), especially when the table has a FOREIGN KEY which references its own PRIMARY KEY. To join a table itself means that each row of the table is combined with itself and with every other row of the table. The self join can be viewed as a join of two copies of the same table. The table is not actually copied, but SQL performs the command as though it were.