Final Answer:
Correlated subquery terms refers to a type of subquery that is processed, or executed, once for each row in the outer query. Thus the correct option is B. Correlated subquery.
Step-by-step explanation:
A correlated subquery is a type of subquery that is processed once for each row in the outer query. Unlike other subqueries, the correlated subquery depends on the values from the outer query. This means that the subquery is executed repeatedly, once for each row in the result set of the outer query.
In a correlated subquery, the inner query references columns from the tables in the outer query. This creates a relationship between the inner and outer queries, making the subquery's execution dependent on the data from the outer query. The correlation enables the subquery to be executed in the context of each row of the outer query, providing tailored results for each iteration.
For example, if we have a query that retrieves employee information along with the total number of employees in each department, a correlated subquery could be used to calculate the count for each department dynamically. The subquery would be processed once for each department in the outer query, producing accurate and specific results for each department.
In summary, a correlated subquery is the correct choice because it is specifically designed to be executed once for each row in the outer query, taking into account the values from that row to generate tailored results.
Thus the correct option is B. Correlated subquery.