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TEST SQL COURSE E2E
course content

Course Content

TEST SQL COURSE E2E

TEST SQL COURSE E2E

1. Sorting Retrieved Data
Sorting DataChallengeSorting by Multiple Columns
2. Retrieving Data
Retrieving Individual ColumnsRetrieving Multiple Columns Retrieving Distinct Rows
3. Failing init script
4. Long execution init script

bookRetrieving Multiple Columns

Let's find out a little more about this database. A country database contains one table, named country. Let's look at this table.

This table has 15 rows. In other words, we have 15 different records for different countries.

What about columns? Here we have 7 columns, like id, name, continent, region, SurfaceArea, capital and population.

1. id - the record number of this table

2. name - the name of the country

3. continent - the name of the country's continent;

4. region- the name of the country's region

5. SurfaceArea - the surface area of the country

6. capital - the capital of the country

7. population - the population of the country.

We can also retrieve multiple columns with the SELECT operator. The only difference is that after the word SELECT, we will need to specify several column names, which must be separated by a comma. Let’s take an example where we retrieve three columns from the country table.


              
12

            
SELECT id, name, capital  FROM country;
copy

Task

You have to retrieve the continent and population 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 2. Chapter 2
toggle bottom row

bookRetrieving Multiple Columns

Let's find out a little more about this database. A country database contains one table, named country. Let's look at this table.

This table has 15 rows. In other words, we have 15 different records for different countries.

What about columns? Here we have 7 columns, like id, name, continent, region, SurfaceArea, capital and population.

1. id - the record number of this table

2. name - the name of the country

3. continent - the name of the country's continent;

4. region- the name of the country's region

5. SurfaceArea - the surface area of the country

6. capital - the capital of the country

7. population - the population of the country.

We can also retrieve multiple columns with the SELECT operator. The only difference is that after the word SELECT, we will need to specify several column names, which must be separated by a comma. Let’s take an example where we retrieve three columns from the country table.


              
12

            
SELECT id, name, capital  FROM country;
copy

Task

You have to retrieve the continent and population 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 2. Chapter 2
toggle bottom row

bookRetrieving Multiple Columns

Let's find out a little more about this database. A country database contains one table, named country. Let's look at this table.

This table has 15 rows. In other words, we have 15 different records for different countries.

What about columns? Here we have 7 columns, like id, name, continent, region, SurfaceArea, capital and population.

1. id - the record number of this table

2. name - the name of the country

3. continent - the name of the country's continent;

4. region- the name of the country's region

5. SurfaceArea - the surface area of the country

6. capital - the capital of the country

7. population - the population of the country.

We can also retrieve multiple columns with the SELECT operator. The only difference is that after the word SELECT, we will need to specify several column names, which must be separated by a comma. Let’s take an example where we retrieve three columns from the country table.


              
12

            
SELECT id, name, capital  FROM country;
copy

Task

You have to retrieve the continent and population 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!

Let's find out a little more about this database. A country database contains one table, named country. Let's look at this table.

This table has 15 rows. In other words, we have 15 different records for different countries.

What about columns? Here we have 7 columns, like id, name, continent, region, SurfaceArea, capital and population.

1. id - the record number of this table

2. name - the name of the country

3. continent - the name of the country's continent;

4. region- the name of the country's region

5. SurfaceArea - the surface area of the country

6. capital - the capital of the country

7. population - the population of the country.

We can also retrieve multiple columns with the SELECT operator. The only difference is that after the word SELECT, we will need to specify several column names, which must be separated by a comma. Let’s take an example where we retrieve three columns from the country table.


              
12

            
SELECT id, name, capital  FROM country;
copy

Task

You have to retrieve the continent and population 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 2. 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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