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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 All Columns

Instead of listing each column, you can use the asterisk * to retrieve all columns from the table at once. This is especially useful when you need to view all the data in a table without manually typing out each column name. Here’s an example:


              
12

            
SELECT * 
FROM table_name;
copy
Task
test

Swipe to show code editor

Write an SQL query to retrieve ALL columns from the country table.

Switch to desktopSwitch to desktop for real-world practiceContinue from where you are using one of the options below
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Section 1. Chapter 3
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bookRetrieving All Columns

Instead of listing each column, you can use the asterisk * to retrieve all columns from the table at once. This is especially useful when you need to view all the data in a table without manually typing out each column name. Here’s an example:


              
12

            
SELECT * 
FROM table_name;
copy
Task
test

Swipe to show code editor

Write an SQL query to retrieve ALL columns from the country table.

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 3
toggle bottom row

bookRetrieving All Columns

Instead of listing each column, you can use the asterisk * to retrieve all columns from the table at once. This is especially useful when you need to view all the data in a table without manually typing out each column name. Here’s an example:


              
12

            
SELECT * 
FROM table_name;
copy
Task
test

Swipe to show code editor

Write an SQL query to retrieve ALL columns from the country table.

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!

Instead of listing each column, you can use the asterisk * to retrieve all columns from the table at once. This is especially useful when you need to view all the data in a table without manually typing out each column name. Here’s an example:


              
12

            
SELECT * 
FROM table_name;
copy
Task
test

Swipe to show code editor

Write an SQL query to retrieve ALL columns from the country table.

Switch to desktopSwitch to desktop for real-world practiceContinue from where you are using one of the options below
Section 1. Chapter 3
Switch to desktopSwitch to desktop for real-world practiceContinue from where you are using one of the options below
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