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1. In a relational database, what is a foreign key?
A) A key used to sort data in a specific order
B) A unique identifier for a record in a table
C) A key that is used to establish a relationship between two tables
D) A temporary key generated during query execution
2. Which of the following best describes a relational database?
A) A database where all data is stored as key-value pairs
B) A flat file system with no defined relationships between data
C) A database that uses a tabular structure with rows and columns to represent relationships between data entities
D) A database that organizes data hierarchically
3. What is required for the queries combined by a SET operator to work correctly?
A) Both queries must use the GROUP BY clause.
B) The tables must be joined using a primary key.
C) Both queries must include the WHERE clause.
D) The result sets must have the same number of columns and compatible data types.
4. Which SQL clause can be used in Oracle to limit the number of rows returned?
A) WHERE
B) DISTINCT
C) GROUP BY
D) FETCH FIRST n ROWS ONLY
5. How can you ensure that data is sorted in descending order in a SQL query?
A) Use the ORDER keyword
B) Use the ASC keyword
C) Use the DESC keyword
D) Use the DISTINCT keyword
Solutions:
| Question # 1 Answer: C | Question # 2 Answer: C | Question # 3 Answer: D | Question # 4 Answer: D | Question # 5 Answer: C |
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