Master SQL for Data Analysis - Let's Recap!

This video tutorial provides a comprehensive overview of database concepts, focusing on relational databases and SQL. It covers database terminology, table structures, keys, schemas, and metadata. The tutorial also explains how to create and manage databases using SQL commands, and how to query data effectively. Advanced topics include filtering, grouping, and ordering data, as well as understanding the database dictionary. The course concludes with guidance on further learning and practice.

What is the primary function of a DBMS?

• To store data in a spreadsheet format

• To serve as an interface between users and database instances

• To create visualizations of data

• To encrypt data for security

Which of the following is NOT a building block of the relational model?

• Attribute

• Relationship

• Index

• Entity

What is the purpose of a database schema?

• To visualize data trends

• To define the logical structure of related tables

• To store user passwords securely

• To manage network connections

Which SQL command is used to create a new table?

• ALTER TABLE

• INSERT INTO

• DROP TABLE

• CREATE TABLE

What is the purpose of the COPY command in PostgreSQL?

• To insert a large number of rows from a CSV file

• To copy data between schemas

• To duplicate a table

• To create a backup of the database

Which SQL clause is used to filter records based on a condition?

• HAVING

• WHERE

• GROUP BY

• ORDER BY

What is the function of the DISTINCT keyword in SQL?

• To sort the results in ascending order

• To calculate the sum of a column

• To join two tables

• To remove duplicate rows from the result set