What is the function of a left outer join

By Rebecca
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What is the function of a left outer join?

(a) It preserves tuples only in the relation named before the operation

(b) It preserves tuples only in the relation named after the operation

(c) It preserved tuples in the relations named on both the sides of the operation

(d) It does not preserve any tuples on either side of the relation

Answer:

(a) It preserves tuples only in the relation named before the operation

What is the function of a left outer join

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