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5 months ago
When running a correlated subquery, the DBMS ________.

• runs the lower SELECT statement by itself and then sends the results to the upper SELECT statement.

• runs the upper SELECT statement by itself and then sends the results to the lower SELECT statement.

• alternates running the lower SELECT statement with running the upper SELECT statement based on each result of the lower SELECT statement

• Either runs the lower SELECT statement by itself and then sends the results to the upper SELECT statement or runs the upper SELECT statement by itself and then sends the results to the lower SELECT statement may be used depending on the query.
Textbook 
Database Processing: Fundamentals, Design, and Implementation
Edition: 15th
Authors:
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alternates running the lower SELECT statement with running the upper SELECT statement based on each result of the lower SELECT statement
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