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How is the left outer join symbol represented in relational algebra?

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How is the left outer join symbol represented in relational algebra?

(a) ⟕

(b) ⟖

(c) ⟗

(d) ⋈
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The correct option is (a) ⟕

To elaborate: The symbol of the left outer join is similar to the symbol of the natural join but it has two dashes on the top and bottom left side.
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