Database Management with SQL and NoSQL

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Questions and Answers

Which SQL query correctly updates the address of the customer 'White Clover Markets'?

UPDATE Customers WHERE CustomerName='White Clover Markets' SET Address='Windsor, N8Y 2P9, Canada';

UPDATE Customers SET Address='Windsor, N8Y 2P9, Canada' WHERE CustomerName='White Clover Markets'; (correct)

SET Address='Windsor, N8Y 2P9, Canada' WHERE CustomerName='White Clover Markets';

CHANGE Address='Windsor, N8Y 2P9, Canada' WHERE CustomerName='White Clover Markets';

What command would you use to remove the customer 'Wolski' from the Customers table?

DROP Customer FROM Customers WHERE CustomerName='Wolski';

ERASE FROM Customers WHERE CustomerName='Wolski';

REMOVE FROM Customers WHERE CustomerName='Wolski';

DELETE FROM Customers WHERE CustomerName='Wolski'; (correct)

Which of the following statements accurately defines a NoSQL database?

NoSQL databases store data in unstructured or semi-structured formats. (correct)

NoSQL databases use tables and structured schemas similar to relational databases.

NoSQL databases require a fixed schema and predefined data types.

NoSQL databases organize data using hierarchical structures like trees.

Which type of NoSQL database is specifically designed for storing key-value pairs?

Key-value stores Signup and view all the answers

Which option is NOT a characteristic of document databases in NoSQL?

Efficient for managing relationships between documents. Signup and view all the answers

In SQL, what does the SET command specifically do?

It specifies the new value for the column in an update. Signup and view all the answers

Which type of NoSQL database is optimized for querying complex networks of relationships?

Graph databases Signup and view all the answers

What does the DELETE command do in SQL?

Deletes specific rows of data based on a condition. Signup and view all the answers

What is a primary advantage of using NoSQL databases over traditional relational databases?

Simplified database design without rigid schemas. Signup and view all the answers

Which SQL command would you use to add a new record to a table?

INSERT Signup and view all the answers

What command would be used to start the process of importing the data from a CSV file into the students table?

LOAD DATA INFILE '/path/to/your/students.csv' INTO TABLE students Signup and view all the answers

Which backup method only includes the changes made since the last full backup?

Differential backup Signup and view all the answers

In a recovery scenario, what would a transaction log recovery achieve?

It replays in-doubt transactions to achieve consistency. Signup and view all the answers

What command is used to create a backup of the person table in the movie database?

mysqldump -u root -p movie Person > backup_person.sql Signup and view all the answers

What is a necessary step when restoring the movie database from a backup file?

mysql -u root -p movie < backup_movie.sql Signup and view all the answers

Which of the following statements is true regarding full backups?

Full backups include all data in the database. Signup and view all the answers

Which recovery method would you recommend for a server that restarted during active transactions?

Transaction log recovery Signup and view all the answers

What would the option 'IGNORE 1 ROWS;' accomplish in the context of importing CSV data?

Skip the first row, often a header row, during import. Signup and view all the answers

Which command is appropriate for performing a differential backup?

There is no specific SQL command for differential backup. Signup and view all the answers

When using mysqldump to backup a full database, which command is correct?

mysqldump -u root -p movie > backup_movie.sql Signup and view all the answers

Study Notes

SQL Queries for Database Management

SQL queries are used to manage data within a database.
INSERT: Adds new data records to a table.
DELETE: Removes data from a table.
UPDATE: Modifies existing data in a table.
SET: Used with UPDATE to specify which data to update.

Example SQL Statements

INSERT: Adds data to the Customers table
- Example: INSERT INTO Customers (CustomerName, ContactName, Address, City, PostalCode, Country) VALUES ('Cardinal', 'Tom B. Erichsen', 'Skagen 21', 'Stavanger', '4006', 'Norway');
DELETE: Removes a customer from the Customers table
- Example: DELETE FROM Customers WHERE CustomerName='Wolski';
UPDATE: Changes a customer's address
- Example: UPDATE Customers SET City='Windsor', PostalCode='N8Y 2P9', Country='Canada' WHERE CustomerName='White Clover Markets';

NoSQL Databases

NoSQL databases (Not Only SQL) are often called non-relational.
They don't organize data in tables with rows and columns like SQL databases.
NoSQL data is stored in unstructured formats.

Types of NoSQL Databases

Key-value stores: Store data as key-value pairs, where each key is unique.
- Example: User sessions on a website.
Document databases: Store documents in formats like JSON, BSON, or XML.
- More efficient for reading and searching documents than relational databases.
Graph databases: Store data as nodes connected by relationships.
- Efficient for querying networks of data.
Wide Column Stores: Similar to relational tables but columns are not attributes, they're values. Efficient for managing massive tables with sparse information.

A social network might use a graph database to represent users and their connections. Nodes would be users, and connections would indicate friendships.

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Description

This quiz covers essential SQL queries for managing databases, including INSERT, DELETE, and UPDATE commands. It also introduces NoSQL databases and their non-relational structure. Test your knowledge on these crucial aspects of database management!