A correlated subquery references one or more columns in the outer query,and the EXISTS operator is used to test whether the relationship or link is present.
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Q7: The EXISTS operator can be used with
Q8: When a multiple-column subquery is used in
Q9: A multiple-row subquery can be nested in
Q10: When used with a multiple-row subquery,the IN
Q11: Valid single-row operators include =,>,<,>=,<=.
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
Q16: Single-row operators can be used with multiple-row
Q17: The equal sign,=,is a valid single-row operator.
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