Six persons H, I, J, K, L and M have different weights in kg. I is heavier than J but lighter than H, who is the second heaviest among all. L is lighter than M, who is not the heaviest. Who among the following is the heaviest?
K > H > ? > ? > ? > ? Clearly, K is the heaviest.
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In a relational database, a foreign key is used to:
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Which of the following statements about ACID properties in a DBMS is incorrect?
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Which of the following joins returns all rows from both tables, filling in NULL values for non-matching rows?
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