Зміст курсу

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

Filtering by numeric interval

But what if we have a bounded budget and need to choose cars in a specific price range? Simply, we can set two conditions: price > minimum value AND price < maximum value.

Yes, that will work. But SQL provides us with a simple solution to this problem - using BETWEEN statement. The condition above can be rewritten in SQL query as BETWEEN minimum value AND maximum value. For example, we can choose cars with mileage from 1000 to 5000 miles.


              123
            
SELECT *
FROM audi_cars
WHERE mileage BETWEEN 1000 AND 5000

Please note, that both limits are included (i.e. it's equvivalent to 1000 <= mileage <= 5000).

Завдання

From the audi_cars table extract all the cars with prices (column price) in the range [12 000; 15 000].

Завдання

From the audi_cars table extract all the cars with prices (column price) in the range [12 000; 15 000].

Перейдіть на комп'ютер для реальної практикиПродовжуйте з того місця, де ви зупинились, використовуючи один з наведених нижче варіантів

Все було зрозуміло?

Секція 2. Розділ 4

Filtering by numeric interval

But what if we have a bounded budget and need to choose cars in a specific price range? Simply, we can set two conditions: price > minimum value AND price < maximum value.


              123
            
SELECT *
FROM audi_cars
WHERE mileage BETWEEN 1000 AND 5000

Please note, that both limits are included (i.e. it's equvivalent to 1000 <= mileage <= 5000).

Завдання

From the audi_cars table extract all the cars with prices (column price) in the range [12 000; 15 000].

Завдання

From the audi_cars table extract all the cars with prices (column price) in the range [12 000; 15 000].

Все було зрозуміло?

Секція 2. Розділ 4

Filtering by numeric interval

But what if we have a bounded budget and need to choose cars in a specific price range? Simply, we can set two conditions: price > minimum value AND price < maximum value.


              123
            
SELECT *
FROM audi_cars
WHERE mileage BETWEEN 1000 AND 5000

Please note, that both limits are included (i.e. it's equvivalent to 1000 <= mileage <= 5000).

Завдання

From the audi_cars table extract all the cars with prices (column price) in the range [12 000; 15 000].

Завдання

From the audi_cars table extract all the cars with prices (column price) in the range [12 000; 15 000].

Все було зрозуміло?

But what if we have a bounded budget and need to choose cars in a specific price range? Simply, we can set two conditions: price > minimum value AND price < maximum value.


              123
            
SELECT *
FROM audi_cars
WHERE mileage BETWEEN 1000 AND 5000

Please note, that both limits are included (i.e. it's equvivalent to 1000 <= mileage <= 5000).

Завдання

From the audi_cars table extract all the cars with prices (column price) in the range [12 000; 15 000].

Секція 2. Розділ 4