Single-row operators can be used with multiple-row subqueries that return only one column of results.
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Q11: Valid single-row operators include =,>,<,>=,<=.
Q12: A correlated subquery references one or more
Q13: If a subquery is nested in a
Q14: Multiple-row subqueries are nested queries that can
Q15: A single-row subquery can return several columns,but
Q17: The equal sign,=,is a valid single-row operator.
Q18: A subquery nested in a SELECT clause
Q19: A subquery can only be nested in
Q20: A single-row subquery can be nested in
Q21: A(n)single-row subquery can be nested in a(n)SELECT
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