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in the query as if 15 is less than the sum of rental fees ), then the WHERE clause in the outer select evaluates to true, and the corresponding CUSTOMER_ID is added to the result set.
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A few SQL implementations, Oracle in particular, support using a subselect in the FROM clause of a query, a construct that is called an inline view. Essentially, this allows the result set of a subquery to be treated as if it were a prede ned table or view. Here is an example: This query nds the maximum number of times any single movie has been rented:
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SELECT MAX(RENTAL_COUNT) AS MAX_RENTAL_COUNT FROM (SELECT MOVIE_ID, COUNT(*) AS RENTAL_COUNT FROM MOVIE_RENTAL GROUP BY MOVIE_ID) MAX_RENTAL_COUNT ---------------5
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The inner query counts the number of rentals for each value of MOVIE_ID. The outer query then selects the maximum value of RENTAL_COUNT from the inner query, treated it as if it were a prede ned view. There is no limit to what you can do with inline views you can even join them to other views or tables.
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Choose the correct responses to each of the multiple-choice questions. Note that there may be more than one correct response to each question. 1. A subselect a. May be used to select values to be applied to WHERE clause conditions b. May be corrugated or noncorrugated c. Is a powerful way of calculating columns d. Must not be enclosed in parentheses e. Allows for the exible selection of rows
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2. A join without a WHERE clause or JOIN clause a. Results in an error message b. Returns no rows in the result set c. Performs an outer join d. Performs an inner join e. Results in a Cartesian product 3. An outer join a. May be written in Oracle SQL using a (+) symbol in the FROM clause b. May be written in Microsoft SQL Server using a *= or =* operator in the WHERE clause c. Returns all rows from only one of the two tables d. Returns all rows from one or both of the two tables e. Can be a left, right, or full outer join 4. A self join a. Can never result in a Cartesian product b. Can be either an inner or outer join c. Resolves recursive relationships d. May use a subselect to further limit rows e. Involves two different tables 5. A join a. Combines columns from two or more tables into a single query result b. Combines rows from multiple queries into a single query result c. Occurs whenever the FROM clause references more than one table d. Requires the use of a JOIN clause e. Requires a comma-separated table name list in the FROM clause 6. An equijoin a. Is also known as an outer join b. Is also known as an inner join c. Is also known as a self join d. Always matches rows using an equal (=) condition e. Always matches rows using a not equal (<>) condition
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7. Column name quali ers a. Resolve ambiguous column references b. May be a table name
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c. May be a number denoting the relative position of the table in the FROM list d. May be a column alias de ned in the FROM clause e. May be a table alias de ned in the FROM clause 8. A cross join is the same as a. A natural join b. A Cartesian product c. An outer join d. An inner join e. A self join 9. A JOIN clause with a USING keyword a. Cannot be used when the columns being matched have different names b. Cannot be used when the columns being matched have the same names c. De nes an inner join d. De nes an outer join e. De nes a self join 10. A correlated subselect a. Runs more ef ciently than a noncorrelated subselect b. Runs less ef ciently than a noncorrelated subselect c. Has a nested select that references column values from the outer select d. Has an outer select that references column values from the inner select e. Has a nested select that makes no reference to the column values in the outer select Write SQL SELECT statements to solve the problems listed below. 11. List the name and Customer Account ID of any deceased person (DEATH_ DATE that is NOT NULL) who is still listed on a Customer Account. 12. List the name of employees who are listed on a Customer Account. Use joins to determine which customers are employees and which employees have accounts.
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