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| Section | Objectives |
|---|---|
| Using Joins | - Use cross joins - Use self-joins - Use equijoins and non-equijoins - Use outer joins (LEFT, RIGHT, FULL) |
| Using Subqueries | - Use correlated subqueries - Use single-row subqueries - Use multiple-row subqueries |
| Using SELECT Statements | - Use the WHERE clause to restrict rows - Execute a basic SELECT statement - Use the FETCH clause to limit rows returned - Use the ORDER BY clause to sort rows |
| Using DDL Statements | - Create and manage sequences - Create and manage views - Create and manage tables - Create and manage constraints - Create and manage indexes |
| Using Set Operators | - Use UNION, UNION ALL, INTERSECT, and MINUS operators |
| Controlling User Access | - Create and manage roles - Differentiate system privileges from object privileges - Grant and revoke privileges |
| Using DML Statements | - Delete rows from a table - Insert rows into a table - Update rows in a table - Control transactions - Use the MERGE statement |
| Using SQL Functions | - Use character, number, and date functions in SELECT statements - Use conversion functions |
1. What is the purpose of a correlated subquery?
A) A subquery that references columns from the outer query
B) A subquery that can be used only with aggregate functions
C) A subquery that depends on the result of another subquery
D) A subquery that combines data from multiple tables
2. Which SQL function converts a string representation of a date into a date data type?
A) DATE_CONVERT
B) TO_DATE
C) CAST_TO_DATE
D) CONVERT_TO_DATE
3. What is required for the queries combined by a SET operator to work correctly?
A) The tables must be joined using a primary key.
B) The result sets must have the same number of columns and compatible data types.
C) Both queries must use the GROUP BY clause.
D) Both queries must include the WHERE clause.
4. Which of the following can be achieved using a correlated subquery?
A) Comparing each employee's salary to the average salary of their department
B) Retrieving duplicate records from a single table
C) Joining two tables without a common column
D) Inserting data into a table
5. What is the default order of evaluation when multiple SET operators are used in a query?
A) INTERSECT, MINUS, UNION
B) INTERSECT, UNION, MINUS
C) UNION, INTERSECT, MINUS
D) UNION, MINUS, INTERSECT
Solutions:
| Question # 1 Answer: A | Question # 2 Answer: B | Question # 3 Answer: B | Question # 4 Answer: A | Question # 5 Answer: B |
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