SQL Concepts and Functions

This video tutorial introduces SQL, a programming language for managing databases. It covers the basic structure of SQL commands, focusing on the select statement, which is essential for the IGCSE syllabus. The tutorial demonstrates how to use Python to execute SQL commands and provides examples of select statements with various criteria. It also explores more complex SQL queries using Boolean operators and aggregate functions like count and sum. The video aims to equip students with the necessary SQL knowledge for their exams.

What does SQL stand for?

• Structured Query Language

• Sequential Query Language

• Standard Query Language

• Simple Query Language

Which SQL statement is essential for the IGCSE syllabus?

• DELETE

• INSERT

• SELECT

• UPDATE

What keyword is used to specify the table in a SELECT statement?

• TABLE

• FROM

• SELECT

• WHERE

In the query 'SELECT population FROM world WHERE name = 'Albania'', what does 'population' represent?

• Clause

• Criteria

• Field

• Table

Which wildcard character is used to select all fields in a table?

• #

• *

• _

• %

What does the LIKE clause do in a SQL query?

• Deletes records

• Joins two tables

• Filters data based on a pattern

• Sorts the data

Which Boolean operator can be used in a WHERE clause?

• SUM

• AND

• LIKE

• ORDER BY

What does the COUNT function do in SQL?

• Adds up values

• Calculates the average

• Counts the number of rows

• Finds the maximum value

Which data types can the SUM function be used on?

• Date and Time

• Integer and Real

• Boolean and Text

• Text and Integer

In the query 'SELECT SUM(population) FROM world WHERE continent = 'Europe'', what does the SUM function do?

• Counts the number of records

• Sorts the population values

• Adds up the population values

• Finds the average population