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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
Checking for a Range of Values

To check for a range of values, we should use the BETWEEN operator. This operator requires two values: the start-value and the end-value of the range. Also, the AND keyword should be placed between these values.

Here is the syntax for using the BETWEEN operator:

Let's see an example:


              
123

            
SELECT name, population
FROM country
WHERE population BETWEEN 100000 AND 3000000;
copy

Here is the country table we are working with:

Task
test

Swipe to show code editor

Write an SQL query that returns the name, capital, and population columns from the country table (please retrieve these columns in this order), for all countries with a population between 6000000 and 80000000. Then sort the result by capital from A to Z.

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Section 3. Chapter 5
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book
Checking for a Range of Values

To check for a range of values, we should use the BETWEEN operator. This operator requires two values: the start-value and the end-value of the range. Also, the AND keyword should be placed between these values.

Here is the syntax for using the BETWEEN operator:

Let's see an example:


              
123

            
SELECT name, population
FROM country
WHERE population BETWEEN 100000 AND 3000000;
copy

Here is the country table we are working with:

Task
test

Swipe to show code editor

Write an SQL query that returns the name, capital, and population columns from the country table (please retrieve these columns in this order), for all countries with a population between 6000000 and 80000000. Then sort the result by capital from A to Z.

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!

Section 3. Chapter 5
Switch to desktopSwitch to desktop for real-world practiceContinue from where you are using one of the options below
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