Discussion
The wildcard in a WHERE clause is useful when?
Answer: B
Correct answer: An exact match is not possible in a SELECT statement.
Wildcards exist for the case where the exact value is unknown or where a pattern rather than a value is wanted - every surname beginning with "Mc", every product code with a particular third character.
Where the value is known exactly, = is both simpler and faster, since an equality test can use an index while a pattern beginning with a wildcard generally cannot. Wildcards belong to LIKE in a WHERE clause, so they have no place in a CREATE statement, which defines structure rather than selecting data.
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