Course Content

SQL Basics

1. Selecting

The very first meet with the database SELECTing certain columns LIMITing results Unique values from column Unique values from multiple columns How many?How many unique?Aliases Tables aliases

2. Filtering

Word filtering Number filtering Combining conditions Filtering by numeric interval Multiple filtering on one column LIKE filtering NOT like this!

3. Aggregating

MINimal and MAXimal values SUMming values Mean values ROUNDing

4. Sorting

Sorting by one column Sorting in DESCending order The cheapest car Sorting by multiple columns

5. Grouping

What is grouping?More aggregate statistics!Grouping by multiple columns The cheapest combination HAVING some conditions Least consuming cars Filtering group size

6. Practicing

Challenge: Unique combinations Challenge: Average Q-series cars price Challenge: The cheapest new A-series cars Challenge: Relation between engine size and fuel consumption Challenge: Mileage and manufacture year - is there relation?Challenge: Average price for each model and year Challenge: The most expensive transmission + engine size combinations

The very first meet with the database

Welcome on board! SQL (Structured Query Language) is the programming language used for manipulating and extracting data from databases. Usually, the code used to extract some data is called a query. In this course, you will learn how to build different queries: from the simplest to more complex. Over this course, you will work with the audi_cars database which contains information on price, model, and different characteristics of used Audi cars.

The very first query

The simplest query in SQL looks like a sentence: select something from somewhere. To select all the rows from the database write


              12
            
SELECT *
FROM table_name

Please note, that SQL is case-insensitive, i.e. SELECT and select will be equally interpreted by SQL.

Task

Extract all the rows from the audi_cars table.

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 1. Chapter 1

The very first meet with the database

The very first query

The simplest query in SQL looks like a sentence: select something from somewhere. To select all the rows from the database write


              12
            
SELECT *
FROM table_name

Please note, that SQL is case-insensitive, i.e. SELECT and select will be equally interpreted by SQL.

Task

Extract all the rows from the audi_cars table.

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 1. Chapter 1

The very first meet with the database

The very first query

The simplest query in SQL looks like a sentence: select something from somewhere. To select all the rows from the database write


              12
            
SELECT *
FROM table_name

Please note, that SQL is case-insensitive, i.e. SELECT and select will be equally interpreted by SQL.

Task

Extract all the rows from the audi_cars table.

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

Everything was clear?

Thanks for your feedback!

The very first query

The simplest query in SQL looks like a sentence: select something from somewhere. To select all the rows from the database write


              12
            
SELECT *
FROM table_name

Please note, that SQL is case-insensitive, i.e. SELECT and select will be equally interpreted by SQL.

Task

Extract all the rows from the audi_cars table.

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

Section 1. Chapter 1

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