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Introduction to SQL
course content

Course Content

Introduction to SQL

Introduction to SQL

1. Retrieving Data
Retrieving Individual ColumnsRetrieving Multiple Columns Retrieving All ColumnsRetrieving Distinct RowsLimiting ResultsChallenge: Find the Population of the CountriesChallenge: Find All CountriesChallenge: Find All Countries With Their IDsChallenge: Find Country CapitalsChallenge: Find the Regions in Which All Countries Are Located
2. Sorting Retrieved Data
Sorting DataChallenge: Population SortSorting by Multiple ColumnsChallenge: Dual-Sort QuerySpecifying Sort DirectionChallenge: Sort the Countries by Region and CapitalChallenge: Sort Capitals in Descending OrderChallenge: Sort Countries in Ascending OrderChallenge: Find Countries, Their IDs, and Their PopulationsChallenge: Find Countries, IDs, Populations, Regions, and Sort ThemChallenge: Find All Continents and Sort Them in Ascending Order
3. Filtering Data
Using the WHERE ClauseChallenge: North America Population SortThe WHERE Clause Operators Challenge: Population Threshold QueryChecking for a Range of ValuesChecking for NO Value
4. Advanced Data Filtering
Using the AND OperatorChallenge: Europe Region SortUsing the OR operatorChallenge: America Regions FilterUsing the NOT OperatorChallenge: Non-Europe Capitals Sort
5. Aggregate Functions
The AVG() FunctionChallenge: Surface Area SelectionThe COUNT() FunctionChallenge: Continental CountThe MAX() FunctionThe MIN() FunctionChallenge: Large Surface Area AverageThe SUM() Function

book
Using the OR operator

The OR operator is used to filter records based on more than one condition, like if you want to return all countries from Asia but also those from Europe.

Here is the syntax of using the OR operator:

sql

Let's look at the example:


              
123

            
SELECT name, population, continent, region
FROM country
WHERE continent = 'Asia' OR continent = 'Europe';
copy

Here is the country table we are working with:

Task

Swipe to start coding

Write an SQL query to retrieve the name of the countries that are from 'Asia' or 'North America' continent.

Note

Note that north america is not the same as North America, and asia is not the same as Asia. Be careful and write correctly: North America and Asia.

Solution

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SectionΒ 4. ChapterΒ 3
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book
Using the OR operator

The OR operator is used to filter records based on more than one condition, like if you want to return all countries from Asia but also those from Europe.

Here is the syntax of using the OR operator:

sql

Let's look at the example:


              
123

            
SELECT name, population, continent, region
FROM country
WHERE continent = 'Asia' OR continent = 'Europe';
copy

Here is the country table we are working with:

Task

Swipe to start coding

Write an SQL query to retrieve the name of the countries that are from 'Asia' or 'North America' continent.

Note

Note that north america is not the same as North America, and asia is not the same as Asia. Be careful and write correctly: North America and Asia.

Solution

Switch to desktopSwitch to desktop for real-world practiceContinue from where you are using one of the options below
Everything was clear?

How can we improve it?

Thanks for your feedback!

SectionΒ 4. ChapterΒ 3
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