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Define in which normalisation form if an attribute of a composite key is dependent on an attribute of other composite key.
Ans: 3NF
A relation is in 3 NF if an attribute of a composite key is relies on an attribute of other composite key. (If an attribute of a composite key is relies upon an attribute of other composite key then the relation is not in BCNF, therefore it has to be decomposed.)
Explain the EXISTS and UNIQUE functions of SQL. Give an example for each? EXISTS: The EXISTS function takes one parameter that is a SQL statement. If any records exist which
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Data slice explanation
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