course content

Course Content

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 DataChallengeSorting by Multiple ColumnsChallengeSpecifying 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 ClauseChallengeThe WHERE Clause Operators ChallengeChecking for a Range of ValuesChecking for NO Value

4. Advanced Data Filtering

Using the AND OperatorChallengeUsing the OR operatorChallengeUsing the NOT OperatorChallenge

5. Aggregate Functions

The AVG() FunctionChallengeThe COUNT() FunctionChallengeThe MAX() FunctionThe MIN() FunctionChallengeThe SUM() Function

Introduction to SQL

Retrieving All ColumnsRetrieving All Columns

Alternatively, we can retrieve all the columns simultaneously from the table without explicitly naming each one. This can be done with an asterisk *. Let's look at an example.

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What syntax is used to retrieve all fields and columns from a table?

Select the correct answer

Everything was clear?

Section 1. Chapter 3