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9. Which of the following statements about JOIN in relational algebra is false?
a. inner join only returns matched records from the tables being joined
b. X join Y is not the same as Y join X
c. K left outer join L returns all records from K and the unmatched values from L will be null
d. P right outer join Q returns all records from Q and the unmatched values from P will be null
9. Which of the following statements about JOIN in relational algebra is false?
a. inner join only returns matched records from the tables being joined
b. X join Y is not the same as Y join X
c. K left outer join L returns all records from K and the unmatched values from L will be null
d. P right outer join Q returns all records from Q and the unmatched values from P will be null
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