Course Content

Introduction to SQL

1. Retrieving Data

Retrieving Individual Columns Retrieving Multiple Columns Retrieving All Columns Retrieving Distinct Rows Limiting Results Challenge: Find the Population of the Countries Challenge: Find All Countries Challenge: Find All Countries With Their IDs Challenge: Find Country Capitals Challenge: Find the Regions in Which All Countries Are Located

2. Sorting Retrieved Data

Sorting Data Challenge: Population Sort Sorting by Multiple Columns Challenge: Dual-Sort Query Specifying Sort Direction Challenge: Sort the Countries by Region and Capital Challenge: Sort Capitals in Descending Order Challenge: Sort Countries in Ascending Order Challenge: Find Countries, Their IDs, and Their Populations Challenge: Find Countries, IDs, Populations, Regions, and Sort Them Challenge: Find All Continents and Sort Them in Ascending Order

3. Filtering Data

Using the WHERE Clause Challenge: North America Population Sort The WHERE Clause Operators Challenge: Population Threshold Query Checking for a Range of Values Checking for NO Value

4. Advanced Data Filtering

Using the AND Operator Challenge: Europe Region Sort Using the OR operator Challenge: America Regions Filter Using the NOT Operator Challenge: Non-Europe Capitals Sort

5. Aggregate Functions

The AVG() Function Challenge: Surface Area Selection The COUNT() Function Challenge: Continental Count The MAX() Function The MIN() Function Challenge: Large Surface Area Average The SUM() Function

Using the NOT Operator

In order to cancel the condition, you need to use the keyword NOT.

The NOT operator is essential when you want to exclude certain records from your query results. It allows you to specify conditions that should not be met, effectively filtering out unwanted data. This can be particularly useful in scenarios where you need to focus on a subset of data that does not meet specific criteria.

First, let’s look at the syntax:

Now let's look at the example:


              123
            
SELECT name, capital
FROM country
WHERE NOT continent='Asia';

Explanation: The NOT operator rejects the condition here; hence, it matches the continent to anything that is not Asia.

Here is the country table we are working with:

Task

Swipe to show code editor

Write an SQL query to get the name and capital columns from the country table (please retrieve these columns in this order). These countries must be not from the 'South America' continent.

Note

Pay attention to the fact that the names of the continents begin with a capital letter and not a lowercase one; this is very important.

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Section 4. Chapter 5

Using the NOT Operator

In order to cancel the condition, you need to use the keyword NOT.

First, let’s look at the syntax:

Now let's look at the example:


              123
            
SELECT name, capital
FROM country
WHERE NOT continent='Asia';

Explanation: The NOT operator rejects the condition here; hence, it matches the continent to anything that is not Asia.

Here is the country table we are working with:

Task

Swipe to show code editor

Write an SQL query to get the name and capital columns from the country table (please retrieve these columns in this order). These countries must be not from the 'South America' continent.

Note

Pay attention to the fact that the names of the continents begin with a capital letter and not a lowercase one; this is very important.

Switch to desktop for real-world practiceContinue from where you are using one of the options below

Everything was clear?

Thanks for your feedback!

Section 4. Chapter 5

Using the NOT Operator

In order to cancel the condition, you need to use the keyword NOT.

First, let’s look at the syntax:

Now let's look at the example:


              123
            
SELECT name, capital
FROM country
WHERE NOT continent='Asia';

Explanation: The NOT operator rejects the condition here; hence, it matches the continent to anything that is not Asia.

Here is the country table we are working with:

Task

Swipe to show code editor

Write an SQL query to get the name and capital columns from the country table (please retrieve these columns in this order). These countries must be not from the 'South America' continent.

Note

Pay attention to the fact that the names of the continents begin with a capital letter and not a lowercase one; this is very important.

Switch to desktop for real-world practiceContinue from where you are using one of the options below

Everything was clear?

Thanks for your feedback!

In order to cancel the condition, you need to use the keyword NOT.

First, let’s look at the syntax:

Now let's look at the example:


              123
            
SELECT name, capital
FROM country
WHERE NOT continent='Asia';

Explanation: The NOT operator rejects the condition here; hence, it matches the continent to anything that is not Asia.

Here is the country table we are working with:

Task

Swipe to show code editor

Write an SQL query to get the name and capital columns from the country table (please retrieve these columns in this order). These countries must be not from the 'South America' continent.

Note

Pay attention to the fact that the names of the continents begin with a capital letter and not a lowercase one; this is very important.

Switch to desktop for real-world practiceContinue from where you are using one of the options below

Section 4. Chapter 5

Switch to desktop for real-world practiceContinue from where you are using one of the options below