How does a SELECT query work in SQL? Provide an example.

SELECT column1, column2 FROM table_name WHERE condition

SELECT column1, column2 WHERE condition

SELECT column1, column2 FROM table_name ORDER BY column1

What is the purpose of a DELETE query in SQL? Give an example.

DELETE FROM table_name WHERE condition;

DELETE * table_name WHERE condition;

REMOVE FROM table_name WHERE condition;

DROP FROM table_name WHERE condition;

What is the difference between INNER JOIN and OUTER JOIN in SQL?

INNER JOIN compares and returns matching rows, while OUTER JOIN returns all rows with NULLs for non-matching rows.

INNER JOIN is faster than OUTER JOIN in terms of performance

INNER JOIN is used for self-joins, while OUTER JOIN is used for joining different tables

INNER JOIN combines all rows from both tables, while OUTER JOIN only includes matching rows

Give an example of using the SUM() function in SQL.

SELECT SUM(column_name) FROM table_name;

SUM(column_name) FROM table_name;

SUM(column_name) ORDER BY table_name;

SELECT SUM(column_name) WHERE table_name;

What is the role of PRIMARY KEY constraint in a table?

Uniquely identifies each record in a table and enforces uniqueness and non-null values for the specified column(s).

Limits the number of records that can be stored in the table.

Automatically sorts the records in the table based on the specified column(s).

Ensures data integrity by allowing duplicate values in the specified column(s).

How can you use a subquery to filter results in SQL?

SELECT * FROM table_name WHERE column_name IN (SELECT column_name FROM another_table WHERE condition)

SELECT * FROM table_name WHERE column_name NOT IN (SELECT column_name FROM another_table WHERE condition)

SELECT * FROM table_name WHERE column_name = (SELECT column_name FROM another_table WHERE condition)

SELECT * FROM table_name WHERE column_name LIKE (SELECT column_name FROM another_table WHERE condition)

Explain the process of database normalization and its benefits.

The benefits of database normalization include minimizing data redundancy, improving data integrity, enhancing query performance, simplifying data maintenance, and reducing the chances of anomalies.

Database normalization makes data maintenance more complex.

Database normalization is the process of adding redundant data to improve performance.

Database normalization has no impact on data integrity.

What is the purpose of the HAVING clause in SQL queries?

The HAVING clause is used to filter rows after the GROUP BY clause has been applied.

The HAVING clause is used to filter rows before the GROUP BY clause is applied.

The HAVING clause is used to sort rows in a specific order.

The HAVING clause is used to limit the number of rows returned in a query.

Explain the difference between UNION and UNION ALL in SQL.

UNION combines and removes duplicate rows from the result set, while UNION ALL combines all rows including duplicates.

UNION ALL combines and removes duplicate rows from the result set, while UNION combines all rows including duplicates.

UNION sorts the result set in ascending order, while UNION ALL sorts it in descending order.

UNION ALL sorts the result set in ascending order, while UNION sorts it in descending order.

What is the purpose of the TRUNCATE statement in SQL?

TRUNCATE statement is used to remove all rows from a table, but the table structure remains intact.

TRUNCATE statement is used to delete specific rows from a table based on a condition.

TRUNCATE statement is used to update specific rows in a table based on a condition.

TRUNCATE statement is used to add new rows to a table.

Explain the concept of SQL Indexes and their importance.

SQL Indexes are used to improve the performance of queries by providing quick access to rows in a table.

SQL Indexes are used to sort data in a table.

SQL Indexes are used to enforce data integrity constraints.

SQL Indexes are used to delete specific rows from a table based on a condition.

What is the purpose of the GROUP BY clause in SQL queries? Provide an example.

The GROUP BY clause is used to combine rows into summary rows based on a column value.

The GROUP BY clause is used to filter rows before the WHERE clause is applied.

The GROUP BY clause is used to sort rows in a specific order.

The GROUP BY clause is used to limit the number of rows returned in a query.

Explain the difference between a LEFT JOIN and a RIGHT JOIN in SQL.

LEFT JOIN returns all rows from the left table and the matched rows from the right table, while RIGHT JOIN returns all rows from the right table and the matched rows from the left table.

LEFT JOIN combines all rows from both tables, while RIGHT JOIN only includes matching rows.

LEFT JOIN is used for self-joins, while RIGHT JOIN is used for joining different tables.

LEFT JOIN compares and returns matching rows, while RIGHT JOIN returns all rows with NULLs for non-matching rows.

Explain the concept of SQL Views and their significance.

SQL Views are virtual tables that display the result of a SELECT query and provide a way to simplify complex queries and secure sensitive data.

SQL Views are used to delete specific rows from a table based on a condition.

SQL Views are used to enforce data integrity constraints.

SQL Views are used to sort data in a table.

What is the purpose of the DISTINCT keyword in SQL queries? Provide an example.

The DISTINCT keyword is used to remove duplicate rows from the result set.

The DISTINCT keyword is used to filter rows before the WHERE clause is applied.

The DISTINCT keyword is used to sort rows in a specific order.

The DISTINCT keyword is used to limit the number of rows returned in a query.

What is the purpose of the LIKE operator in SQL queries? Provide an example.

The LIKE operator is used to search for a specified pattern in a column.

The LIKE operator is used to filter rows before the WHERE clause is applied.

The LIKE operator is used to sort rows in a specific order.

The LIKE operator is used to combine rows into summary rows based on a column value.

What is the purpose of the ORDER BY clause in SQL queries? Provide an example.

The ORDER BY clause is used to sort rows in a specific order.

The ORDER BY clause is used to limit the number of rows returned in a query.

The ORDER BY clause is used to filter rows before the WHERE clause is applied.

The ORDER BY clause is used to combine rows into summary rows based on a column value.

Give an example of using the SUM() function in SQL.

SELECT SUM(column_name) FROM table_name;

SUM(column_name) FROM table_name;

SUM(column_name) ORDER BY table_name;

SELECT SUM(column_name) WHERE table_name;

Explain the difference between a PRIMARY KEY and a UNIQUE constraint in SQL.

PRIMARY KEY constraint uniquely identifies each record in a table and does not allow NULL values, while UNIQUE constraint ensures that all values in a column are unique but allows NULL values.

PRIMARY KEY constraint allows NULL values, while UNIQUE constraint does not allow NULL values.

PRIMARY KEY constraint can be applied to multiple columns, while UNIQUE constraint can only be applied to a single column.

PRIMARY KEY constraint is used for sorting data in a table, while UNIQUE constraint is used for filtering data.

How does the WHERE clause work in SQL queries? Provide an example.

WHERE clause is used to filter rows based on a specified condition, such as 'SELECT * FROM table_name WHERE column_name = value'.

WHERE clause is used to sort rows in a specific order.

WHERE clause is used to combine rows into summary rows based on a column value.

WHERE clause is used to limit the number of rows returned in a query.

What is the purpose of the BETWEEN operator in SQL queries? Provide an example.

The BETWEEN operator is used to filter rows based on a specific range of values.

The BETWEEN operator is used to sort rows in a specific order.

The BETWEEN operator is used to combine rows into summary rows based on a column value.

The BETWEEN operator is used to limit the number of rows returned in a query.

MySQL is a relational database management system

MySQL is a programming language

MySQL is a web development framework

MySQL is a cloud computing platform

What is the purpose of the UPDATE query in SQL? Provide an example.

UPDATE table_name SET column_name = value WHERE condition;

MODIFY table_name SET column_name = value WHERE condition;

CHANGE table_name SET column_name = value WHERE condition;

ALTER table_name SET column_name = value WHERE condition;

How can you use the SET keyword in an UPDATE query in SQL?

SET is used to specify the columns and values to be updated in the query.

SET is used to filter rows based on a specified condition.

SET is used to combine rows into summary rows based on a column value.

SET is used to limit the number of rows returned in a query.

Explain the importance of using WHERE clause in an UPDATE query.

WHERE clause is used to filter rows based on a specified condition.

WHERE clause is used to specify the columns and values to be updated in the query.

WHERE clause is used to combine rows into summary rows based on a column value.

WHERE clause is used to limit the number of rows returned in a query.

MySQL

Authored by Anurag Kalmodiya

Computers

12th Grade

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MULTIPLE CHOICE QUESTION

45 sec • 2 pts

What are the different data types available in SQL?

integer, float, char, varchar, date, time, timestamp, boolean

text

string

double

MULTIPLE CHOICE QUESTION

45 sec • 2 pts

Explain the concept of SQL Joins with an example.

An example of SQL Join would be: SELECT Orders.OrderID, Customers.CustomerName FROM Orders RIGHT JOIN Customers ON Orders.CustomerID = Customers.CustomerID;

SELECT Orders.OrderID, Customers.CustomerName FROM Orders LEFT JOIN Customers ON Orders.CustomerID = Customers.CustomerID;

An example of SQL Join would be: SELECT Orders.OrderID, Customers.CustomerName FROM Orders INNER JOIN Customers ON Orders.CustomerID = Customers.CustomerID;

An example of SQL Join would be: SELECT Orders.OrderID, Customers.CustomerName FROM Orders CROSS JOIN Customers ON Orders.CustomerID = Customers.CustomerID;

MULTIPLE CHOICE QUESTION

45 sec • 2 pts

What are Aggregate Functions in SQL? Provide examples.

Aggregate functions in SQL are functions that operate on a set of values to return a single value. Examples include COUNT(), SUM(), AVG(), MIN(), and MAX().

Aggregate functions in SQL return multiple values instead of a single value

Examples of Aggregate Functions in SQL include DELETE() and UPDATE()

Aggregate functions in SQL are functions that operate on a single value

MULTIPLE CHOICE QUESTION

45 sec • 2 pts

Discuss the importance of SQL Constraints in database management.

SQL Constraints play a crucial role in maintaining data integrity and consistency in a database by enforcing rules on the data stored in tables.

SQL Constraints are primarily used for data encryption in databases.

SQL Constraints are unnecessary and slow down database operations.

SQL Constraints are only used for aesthetic purposes in database design.

MULTIPLE CHOICE QUESTION

45 sec • 2 pts

How are Subqueries used in SQL? Provide a scenario.

Subqueries are used in SQL to combine multiple tables into one result set.

Subqueries are used in SQL to sort data in descending order.

Subqueries are used in SQL to update multiple records in a single query.

Subqueries are used in SQL to nest one query within another query, allowing for more complex and specific data retrieval.

MULTIPLE CHOICE QUESTION

45 sec • 2 pts

Explain the concept of Normalization in SQL databases.

Normalization involves combining large tables into a single table

Normalization does not involve defining relationships between tables

Normalization in SQL databases is the process of organizing data in a database efficiently. It involves reducing data redundancy and dependency by dividing large tables into smaller ones and defining relationships between them using foreign keys.

Normalization is the process of adding redundancy to data in a database

MULTIPLE CHOICE QUESTION

45 sec • 2 pts

Write a sample INSERT query in SQL.

INSERT INTO table_name (column1, column2, column3) VALUE (value1, value2, value3);

INSERT INTO table_name VALUES (value1, value2, value3);

INSERT INTO table_name (column1, column2, column3) VALUES (value1, value2, value3);

INSERT INTO table_name (column1, column2) VALUES (value1, value2);

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MySQL

What are the different data types available in SQL?

Explain the concept of SQL Joins with an example.

What are Aggregate Functions in SQL? Provide examples.

Discuss the importance of SQL Constraints in database management.

How are Subqueries used in SQL? Provide a scenario.

Explain the concept of Normalization in SQL databases.

Write a sample INSERT query in SQL.

How does a SELECT query work in SQL? Provide an example.

What is the purpose of a DELETE query in SQL? Give an example.

Which data type would you use for storing a date in SQL?

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