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

Sorting by one column

Welcome to the fourth section! Now it's time to learn how to sort the table based on some criteria.

For example, we want to sort the entire audi_cars table based on the mileage column. In SQL to sort by column use ORDER BY col_name statement preceded by WHERE, FROM, and SELECT statements.


              123
            
SELECT *
FROM audi_cars
ORDER BY mileage

Please note, that sorting in SQL is realized in ascending order by default.

Task

From the audi_cars table extract all the cars sorted by price.

Task

From the audi_cars table extract all the cars sorted by price.

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

Everything was clear?

Section 4. Chapter 1

Sorting by one column

Welcome to the fourth section! Now it's time to learn how to sort the table based on some criteria.


              123
            
SELECT *
FROM audi_cars
ORDER BY mileage

Please note, that sorting in SQL is realized in ascending order by default.

Task

From the audi_cars table extract all the cars sorted by price.

Task

From the audi_cars table extract all the cars sorted by price.

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

Everything was clear?

Section 4. Chapter 1

Sorting by one column

Welcome to the fourth section! Now it's time to learn how to sort the table based on some criteria.


              123
            
SELECT *
FROM audi_cars
ORDER BY mileage

Please note, that sorting in SQL is realized in ascending order by default.

Task

From the audi_cars table extract all the cars sorted by price.

Task

From the audi_cars table extract all the cars sorted by price.

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

Everything was clear?

Welcome to the fourth section! Now it's time to learn how to sort the table based on some criteria.


              123
            
SELECT *
FROM audi_cars
ORDER BY mileage

Please note, that sorting in SQL is realized in ascending order by default.

Task

From the audi_cars table extract all the cars sorted by price.

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

Section 4. Chapter 1

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