Specifying the attribute names in the select statement will make it easier to find errors in queries and also correct for problems that may occur in the base system.
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Q49: Figuring out what attributes you want in
Q55: The UNION clause is used to combine
Q56: The following queries produce the same results.
select
Q61: Correlated subqueries are less efficient than queries
Q64: Subqueries can only be used in the
Q69: A subquery in which processing the inner
Q70: EXISTS takes a value of false if
Q77: When EXISTS or NOT EXISTS is used
Q79: The following query will execute without errors.
select
Q80: The following SQL statement is an example
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