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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: Large Surface Area AverageThe COUNT() FunctionChallenge: Continental CountThe MAX() FunctionThe MIN() FunctionChallenge: Surface Area SelectionThe SUM() Function

Challenge: North America Population Sort

Task

Write an SQL query to retrieve the id,name, population, and continent from the country table (please retrieve these columns in this order), returning only rows with the 'North America' continent, and displaying the result in descending order by population.

Note

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

Here's a short example of the country table:

idnamecontinentregionsurfaceareacapitalpopulation
1JapanAsiaEastern Asia377829Tokyo126714000
2LatviaEuropeNULL64589Riga2424200
3MexicoNorth AmericaCentral America1958201Mexico City98881000
.....................
15MaltaEuropeSouthern Europe316Valletta380200

Task

Write an SQL query to retrieve the id,name, population, and continent from the country table (please retrieve these columns in this order), returning only rows with the 'North America' continent, and displaying the result in descending order by population.

Note

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

Here's a short example of the country table:

idnamecontinentregionsurfaceareacapitalpopulation
1JapanAsiaEastern Asia377829Tokyo126714000
2LatviaEuropeNULL64589Riga2424200
3MexicoNorth AmericaCentral America1958201Mexico City98881000
.....................
15MaltaEuropeSouthern Europe316Valletta380200

Everything was clear?

Section 3. Chapter 2
toggle bottom row

Challenge: North America Population Sort

Task

Write an SQL query to retrieve the id,name, population, and continent from the country table (please retrieve these columns in this order), returning only rows with the 'North America' continent, and displaying the result in descending order by population.

Note

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

Here's a short example of the country table:

idnamecontinentregionsurfaceareacapitalpopulation
1JapanAsiaEastern Asia377829Tokyo126714000
2LatviaEuropeNULL64589Riga2424200
3MexicoNorth AmericaCentral America1958201Mexico City98881000
.....................
15MaltaEuropeSouthern Europe316Valletta380200

Task

Write an SQL query to retrieve the id,name, population, and continent from the country table (please retrieve these columns in this order), returning only rows with the 'North America' continent, and displaying the result in descending order by population.

Note

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

Here's a short example of the country table:

idnamecontinentregionsurfaceareacapitalpopulation
1JapanAsiaEastern Asia377829Tokyo126714000
2LatviaEuropeNULL64589Riga2424200
3MexicoNorth AmericaCentral America1958201Mexico City98881000
.....................
15MaltaEuropeSouthern Europe316Valletta380200

Everything was clear?

Section 3. Chapter 2
toggle bottom row

Challenge: North America Population Sort

Task

Write an SQL query to retrieve the id,name, population, and continent from the country table (please retrieve these columns in this order), returning only rows with the 'North America' continent, and displaying the result in descending order by population.

Note

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

Here's a short example of the country table:

idnamecontinentregionsurfaceareacapitalpopulation
1JapanAsiaEastern Asia377829Tokyo126714000
2LatviaEuropeNULL64589Riga2424200
3MexicoNorth AmericaCentral America1958201Mexico City98881000
.....................
15MaltaEuropeSouthern Europe316Valletta380200

Task

Write an SQL query to retrieve the id,name, population, and continent from the country table (please retrieve these columns in this order), returning only rows with the 'North America' continent, and displaying the result in descending order by population.

Note

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

Here's a short example of the country table:

idnamecontinentregionsurfaceareacapitalpopulation
1JapanAsiaEastern Asia377829Tokyo126714000
2LatviaEuropeNULL64589Riga2424200
3MexicoNorth AmericaCentral America1958201Mexico City98881000
.....................
15MaltaEuropeSouthern Europe316Valletta380200

Everything was clear?

Task

Write an SQL query to retrieve the id,name, population, and continent from the country table (please retrieve these columns in this order), returning only rows with the 'North America' continent, and displaying the result in descending order by population.

Note

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

Here's a short example of the country table:

idnamecontinentregionsurfaceareacapitalpopulation
1JapanAsiaEastern Asia377829Tokyo126714000
2LatviaEuropeNULL64589Riga2424200
3MexicoNorth AmericaCentral America1958201Mexico City98881000
.....................
15MaltaEuropeSouthern Europe316Valletta380200

Section 3. Chapter 2
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