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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

bookRetrieving Multiple Columns

Inspecting the Table

Let's delve deeper into the country database. This database contains a single table, also named country. We'll take a closer look at the data within this table.

This table contains 15 rows, representing 15 unique records for various countries.

Now, let's discuss the columns. The table includes 7 columns: id, name, continent, region, SurfaceArea, capital, and population.

  1. id - the unique identifier for each record;

  2. name - the name of the country;

  3. continent - the continent where the country is located;

  4. region - the specific region within the continent;

  5. SurfaceArea - the total land area of the country;

  6. capital - the capital city of the country;

  7. population - the number of people living in the country.

The Syntax for Selecting Multiple Columns

To retrieve multiple columns, use the SELECT statement. After SELECT, list the column names you want to retrieve, separated by commas.

The syntax looks like this:

Here's an example of how to select three columns from the country table:


              
12

            
SELECT id, name, capital 
FROM country;
copy

Here's a short example of the country table:

Task
test

Swipe to show code editor

Write an SQL query to retrieve the continent and population columns from the country table.

Note

Remember that columns must be separated by commas!

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Section 1. Chapter 2
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bookRetrieving Multiple Columns

Inspecting the Table

Let's delve deeper into the country database. This database contains a single table, also named country. We'll take a closer look at the data within this table.

This table contains 15 rows, representing 15 unique records for various countries.

Now, let's discuss the columns. The table includes 7 columns: id, name, continent, region, SurfaceArea, capital, and population.

  1. id - the unique identifier for each record;

  2. name - the name of the country;

  3. continent - the continent where the country is located;

  4. region - the specific region within the continent;

  5. SurfaceArea - the total land area of the country;

  6. capital - the capital city of the country;

  7. population - the number of people living in the country.

The Syntax for Selecting Multiple Columns

To retrieve multiple columns, use the SELECT statement. After SELECT, list the column names you want to retrieve, separated by commas.

The syntax looks like this:

Here's an example of how to select three columns from the country table:


              
12

            
SELECT id, name, capital 
FROM country;
copy

Here's a short example of the country table:

Task
test

Swipe to show code editor

Write an SQL query to retrieve the continent and population columns from the country table.

Note

Remember that columns must be separated by commas!

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 1. Chapter 2
toggle bottom row

bookRetrieving Multiple Columns

Inspecting the Table

Let's delve deeper into the country database. This database contains a single table, also named country. We'll take a closer look at the data within this table.

This table contains 15 rows, representing 15 unique records for various countries.

Now, let's discuss the columns. The table includes 7 columns: id, name, continent, region, SurfaceArea, capital, and population.

  1. id - the unique identifier for each record;

  2. name - the name of the country;

  3. continent - the continent where the country is located;

  4. region - the specific region within the continent;

  5. SurfaceArea - the total land area of the country;

  6. capital - the capital city of the country;

  7. population - the number of people living in the country.

The Syntax for Selecting Multiple Columns

To retrieve multiple columns, use the SELECT statement. After SELECT, list the column names you want to retrieve, separated by commas.

The syntax looks like this:

Here's an example of how to select three columns from the country table:


              
12

            
SELECT id, name, capital 
FROM country;
copy

Here's a short example of the country table:

Task
test

Swipe to show code editor

Write an SQL query to retrieve the continent and population columns from the country table.

Note

Remember that columns must be separated by commas!

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!

Inspecting the Table

Let's delve deeper into the country database. This database contains a single table, also named country. We'll take a closer look at the data within this table.

This table contains 15 rows, representing 15 unique records for various countries.

Now, let's discuss the columns. The table includes 7 columns: id, name, continent, region, SurfaceArea, capital, and population.

  1. id - the unique identifier for each record;

  2. name - the name of the country;

  3. continent - the continent where the country is located;

  4. region - the specific region within the continent;

  5. SurfaceArea - the total land area of the country;

  6. capital - the capital city of the country;

  7. population - the number of people living in the country.

The Syntax for Selecting Multiple Columns

To retrieve multiple columns, use the SELECT statement. After SELECT, list the column names you want to retrieve, separated by commas.

The syntax looks like this:

Here's an example of how to select three columns from the country table:


              
12

            
SELECT id, name, capital 
FROM country;
copy

Here's a short example of the country table:

Task
test

Swipe to show code editor

Write an SQL query to retrieve the continent and population columns from the country table.

Note

Remember that columns must be separated by commas!

Switch to desktopSwitch to desktop for real-world practiceContinue from where you are using one of the options below
Section 1. Chapter 2
Switch to desktopSwitch to desktop for real-world practiceContinue from where you are using one of the options below
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