SQL Join and Like Quiz

What is the purpose of the SQL join statement?

• To combine rows from two or more tables based on a related column

• To create a new table

• To update rows in a table

• To delete rows from a table

How is the SQL Like keyword used in a query?

• The SQL Like keyword is used to perform mathematical operations in a query

• The SQL Like keyword is used in a query to search for a specified pattern in a column.

• The SQL Like keyword is used to update records in a table

• The SQL Like keyword is used to join multiple tables in a query

Explain the role of the where clause in SQL.

• The WHERE clause is used for sorting data in SQL.

• The WHERE clause is used to create new tables in SQL.

• The WHERE clause filters records based on a specified condition.

• The WHERE clause is used to perform mathematical operations in SQL.

Provide an example of an SQL query using the intersect operator.

• SELECT column_name(s) FROM table1 INTERSECT SELECT column_name(s) FROM table2;

• SELECT column_name(s) FROM table1 EXCEPT SELECT column_name(s) FROM table2;

• SELECT column_name(s) FROM table1 UNION SELECT column_name(s) FROM table2;

• SELECT column_name(s) FROM table1 JOIN SELECT column_name(s) FROM table2;

What does the select statement do in SQL?

• The SELECT statement retrieves data from a database.

• The SELECT statement creates a new database.

• The SELECT statement deletes data from a database.

• The SELECT statement updates data in a database.

Define the concept of projection in SQL.

• Updating values in a table in SQL

• Combining multiple tables in SQL

• Deleting rows from a table in SQL

• Selecting specific columns from a table in SQL.

When would you use a left join in SQL?

• When you want to retrieve all records from the right table and the matched records from the left table.

• When you want to retrieve all records from both tables.

• When you want to retrieve all records from the left table and the matched records from the right table.

• When you want to retrieve only unmatched records from the left table.

Give an example of a complex SQL query involving multiple joins.

• SELECT customers.name, orders.order_date, products.product_name FROM customers JOIN orders ON customers.customer_id = orders.customer_id JOIN order_details ON orders.order_id = order_details.order_id JOIN products ON order_details.product_id = products.product_id;

• SELECT customers.name, orders.order_date, products.product_name FROM customers JOIN orders ON customers.customer_id = orders.customer_id JOIN order_details ON orders.order_id = order_details.order_id JOIN products ON order_details.product_id = products.product_id GROUP BY customers.name;

• SELECT customers.name, orders.order_date, products.product_name FROM customers JOIN orders ON customers.customer_id = orders.customer_id JOIN order_details ON orders.order_id = order_details.order_id JOIN products ON order_details.product_id = products.product_id WHERE customers.status = 'active';

• SELECT customers.name, orders.order_date, products.product_name FROM customers JOIN orders ON customers.customer_id = orders.customer_id JOIN order_details ON orders.order_id = order_details.order_id LEFT JOIN products ON order_details.product_id = products.product_id;

Using which word allows you to specify that more than one condition must be met in a query?

• Also

• And

• Or

• Where

Using a subquery is equivalent to performing two sequential queries and using the result of the first query as the search values in the second query.

• True

• False