What is a correlated sub-query?Select one:a.A sub-query that substitutes the names of the outer queryb.A sub-query that uses the correlation name of an outer queryc.A sub-query that does not depend on its outer query’s correlation namesd.An independent query that uses the correlation name of another independent query.
Question
What is a correlated sub-query?Select one:a.A sub-query that substitutes the names of the outer queryb.A sub-query that uses the correlation name of an outer queryc.A sub-query that does not depend on its outer query’s correlation namesd.An independent query that uses the correlation name of another independent query.
Solution
A correlated sub-query is a sub-query that uses the correlation name of an outer query. This means that the sub-query depends on the outer query for its values, and it is executed once for each row processed by the outer query. This is different from a regular sub-query, which is run only once and the results are used by the main query.
Similar Questions
Which of the following is a correlated subquery?Select one:a.Uses the result of an outer query to determine the processing of an outer queryb.Uses the result of an inner query to determine the processing of an outer queryc.Uses the result of an inner query to determine the processing of an inner queryd.Uses the result of an outer query to determine the processing of an inner query
What is unique about a correlated subquery?1 pointA correlated subquery depends on input from the outer query to return values and always appear in the WHERE clause.A correlated subquery is independent of the outer query meaning they can be executed as a standalone query and always appear in the WHERE clause.A correlated subquery depends on input from the outer query to return values and always appear in the FROM clause.A correlated subquery is independent of the outer query meaning they can be executed as a standalone query and always appear in the FROM clause.
When you have a query inside of another query, the term “subquery” refers to which query?1 pointInnerOuter
What is a subquery?a.A subquery is a condition that excludes all the invalid tuples from the databaseb.A subquery is a relation that is externally specified which can be used to handle data in queriesc.A subquery is a select-from-where expression that is nested within another queryd.A subquery is any query that is nested within another query
What is true about co-related sub-queries?The tables used in the main query are also used in a co-related sub-queryThe sub-queries which reference a column used in the main query are called co-related sub-queriesThe sub-queries which are written without parenthesis are called co-related sub-queriesThe sub-queries which mandatorily use different tables than those used in the main query are called co-related sub-queries
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