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feat(curriculum): Add relational database quiz (#56561)
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BethiPooja
@@ -17,439 +17,439 @@ Answer all of the questions below correctly to pass the quiz.
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#### --text--
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Placeholder question
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What is a relational database?
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#### --distractors--
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Placeholder distractor 1
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A database structured to recognize non-relation between stored items.
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---
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Placeholder distractor 2
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A database that stores unstructured data.
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---
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Placeholder distractor 3
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A flat file-based system.
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#### --answer--
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Placeholder answer
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A database structured to recognize relations between stored items.
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### --question--
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#### --text--
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Placeholder question
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How does a non-relational database differ from a relational database?
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#### --distractors--
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Placeholder distractor 1
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Non-relational databases use tables, while relational databases do not.
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---
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Placeholder distractor 2
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Relational databases can store unstructured data.
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---
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Placeholder distractor 3
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Non-relational databases are slower than relational databases.
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#### --answer--
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Placeholder answer
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Non-relational databases can store unstructured data.
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### --question--
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#### --text--
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Placeholder question
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What does the `\l` command do when executed in the PostgreSQL interactive terminal (`psql`)?
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#### --distractors--
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Placeholder distractor 1
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Lists all schemas
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---
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Placeholder distractor 2
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Lists all tables
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---
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Placeholder distractor 3
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Connects to a database
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#### --answer--
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Placeholder answer
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Lists all databases
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### --question--
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#### --text--
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Placeholder question
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Which of the following commands creates a new table in SQL?
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#### --distractors--
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Placeholder distractor 1
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`ADD TABLE`
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---
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Placeholder distractor 2
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`NEW TABLE`
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---
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Placeholder distractor 3
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`ALTER TABLE`
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#### --answer--
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Placeholder answer
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`CREATE TABLE`
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### --question--
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#### --text--
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Placeholder question
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What is the purpose of a foreign key in a relational database?
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#### --distractors--
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Placeholder distractor 1
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To allow duplication of data.
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---
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Placeholder distractor 2
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To uniquely identify a row in the table.
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---
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Placeholder distractor 3
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To store large amounts of text data.
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#### --answer--
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Placeholder answer
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To create a relationship between two tables.
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### --question--
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#### --text--
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Placeholder question
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Which command will add a new column to an existing table?
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#### --distractors--
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Placeholder distractor 1
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`ADD COLUMN column_name TO table_name data_type;`
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---
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Placeholder distractor 2
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`INSERT COLUMN column_name INTO table_name data_type;`
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---
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Placeholder distractor 3
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`MODIFY TABLE table_name ADD COLUMN column_name data_type;`
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#### --answer--
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Placeholder answer
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`ALTER TABLE table_name ADD COLUMN column_name data_type;`
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### --question--
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#### --text--
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Placeholder question
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What type of relationship exists when one record in Table A corresponds to one or more records in Table B?
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#### --distractors--
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Placeholder distractor 1
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One-to-One (1-1)
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---
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Placeholder distractor 2
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Many-to-Many (m-m)
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---
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Placeholder distractor 3
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Many-to-one(m-1)
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#### --answer--
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Placeholder answer
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One-to-Many (1-m)
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### --question--
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#### --text--
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Placeholder question
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What is the primary purpose of normalization in a relational database?
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#### --distractors--
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Placeholder distractor 1
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To increase the speed of data retrieval.
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---
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Placeholder distractor 2
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To enforce security measures.
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---
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Placeholder distractor 3
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To simplify the database schema.
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#### --answer--
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Placeholder answer
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To eliminate data redundancy and ensure data integrity.
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### --question--
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#### --text--
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Placeholder question
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How do you delete a column from a table in SQL?
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#### --distractors--
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Placeholder distractor 1
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`REMOVE COLUMN column_name FROM table_name;`
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---
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Placeholder distractor 2
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`DELETE COLUMN column_name FROM table_name;`
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---
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Placeholder distractor 3
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`MODIFY TABLE table_name DELETE column_name;`
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#### --answer--
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Placeholder answer
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`ALTER TABLE table_name DROP COLUMN column_name;`
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### --question--
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#### --text--
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Placeholder question
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What is the function of the `PRIMARY KEY` constraint in SQL?
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#### --distractors--
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Placeholder distractor 1
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To link two tables together.
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---
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Placeholder distractor 2
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To define the default value for a column.
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---
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Placeholder distractor 3
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To allow null values in the column.
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#### --answer--
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Placeholder answer
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To ensure that the column contains unique values.
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### --question--
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#### --text--
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Placeholder question
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What does the command `\c` do in the PostgreSQL interactive terminal (`psql`)?
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#### --distractors--
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Placeholder distractor 1
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Lists all tables in the current database.
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---
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Placeholder distractor 2
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Displays the current database connection details.
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---
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Placeholder distractor 3
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Exits the `psql` shell.
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#### --answer--
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Placeholder answer
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Connects to the specified database.
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### --question--
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#### --text--
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Placeholder question
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What is a composite key in a relational database?
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#### --distractors--
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Placeholder distractor 1
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A key that is derived from another key.
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---
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Placeholder distractor 2
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A key that changes frequently based on data updates.
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---
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Placeholder distractor 3
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A key used exclusively for foreign key relationships.
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#### --answer--
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Placeholder answer
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A key that is composed of multiple columns to uniquely identify a record.
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### --question--
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#### --text--
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Placeholder question
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Which command inserts data into a table?
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#### --distractors--
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Placeholder distractor 1
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`PUT VALUES`
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---
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Placeholder distractor 2
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`UPDATE INTO`
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---
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Placeholder distractor 3
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`ADD DATA`
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#### --answer--
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Placeholder answer
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`INSERT INTO`
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### --question--
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#### --text--
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Placeholder question
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How do you rename a column in SQL?
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#### --distractors--
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Placeholder distractor 1
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`MODIFY COLUMN`
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---
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Placeholder distractor 2
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`CHANGE COLUMN`
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---
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Placeholder distractor 3
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`ALTER COLUMN`
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#### --answer--
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Placeholder answer
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`RENAME COLUMN`
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### --question--
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#### --text--
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Placeholder question
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Which query will delete all records from the employees table?
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#### --distractors--
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Placeholder distractor 1
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`REMOVE ALL`
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---
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Placeholder distractor 2
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`TRUNCATE employees`
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---
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Placeholder distractor 3
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`DROP RECORDS`
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#### --answer--
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Placeholder answer
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`DELETE FROM employees`
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### --question--
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#### --text--
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Placeholder question
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Which SQL constraint specifically ensures that a column can contain only unique values, allowing nulls?
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#### --distractors--
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Placeholder distractor 1
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`NOT NULL`
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---
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Placeholder distractor 2
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`FOREIGN KEY`
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---
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Placeholder distractor 3
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`PRIMARY KEY`
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#### --answer--
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Placeholder answer
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`UNIQUE`
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### --question--
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#### --text--
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Placeholder question
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In a relational database, what is an index used for?
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#### --distractors--
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Placeholder distractor 1
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To store additional metadata about tables.
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---
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Placeholder distractor 2
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To ensure unique values in a column.
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---
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Placeholder distractor 3
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To enforce data integrity.
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#### --answer--
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Placeholder answer
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To speed up data retrieval.
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### --question--
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#### --text--
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Placeholder question
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What does a one-to-one (1-1) relationship represent in a relational database?
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#### --distractors--
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Placeholder distractor 1
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Each record in Table A corresponds to one or more records in Table B.
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---
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Placeholder distractor 2
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Each record in Table A corresponds to no records in Table B.
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---
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Placeholder distractor 3
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Each record in Table A corresponds to multiple records in Table B and vice versa.
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#### --answer--
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Placeholder answer
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Each record in Table A corresponds to exactly one record in Table B.
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### --question--
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#### --text--
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Placeholder question
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What command will list all tables in the current PostgreSQL database?
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#### --distractors--
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Placeholder distractor 1
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`\l`
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---
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Placeholder distractor 2
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`SHOW TABLES`
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---
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Placeholder distractor 3
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`\t`
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#### --answer--
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Placeholder answer
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`\d`
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### --question--
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#### --text--
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Placeholder question
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What is a composite key in a relational database?
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#### --distractors--
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Placeholder distractor 1
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A key that is derived from another key.
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---
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Placeholder distractor 2
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A key that changes frequently based on data updates.
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---
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Placeholder distractor 3
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A key used exclusively for foreign key relationships.
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#### --answer--
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Placeholder answer
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A key that is composed of multiple columns to uniquely identify a record.
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