database-normalizationfunctional-dependenciesdatabase-theory
What does the symbol "⊇" mean?
In the attached picture there's a symbol I don't understand. To understand additive functional dependency I need to know what the symbol means. Please advice?
It's the symbol where it says: "Suppose that X ⊇ Y and that..."
⊇ = ?
Thanks!
Solution
It means "X is a superset of Y". The subset symbol is the same but flipped horizontally.
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