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SQL Basics
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SQL Basics

SQL Basics

1. Selecting
The very first meet with the databaseSELECTing certain columnsLIMITing resultsUnique values from columnUnique values from multiple columnsHow many?How many unique?AliasesTables aliases
2. Filtering
Word filteringNumber filteringCombining conditionsFiltering by numeric intervalMultiple filtering on one columnLIKE filteringNOT like this!
3. Aggregating
MINimal and MAXimal valuesSUMming valuesMean valuesROUNDing
4. Sorting
Sorting by one columnSorting in DESCending orderThe cheapest carSorting by multiple columns
5. Grouping
What is grouping?More aggregate statistics!Grouping by multiple columnsThe cheapest combinationHAVING some conditionsLeast consuming carsFiltering group size
6. Practicing
Challenge: Unique combinationsChallenge: Average Q-series cars priceChallenge: The cheapest new A-series carsChallenge: Relation between engine size and fuel consumptionChallenge: Mileage and manufacture year - is there relation?Challenge: Average price for each model and yearChallenge: The most expensive transmission + engine size combinations

book
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
copy

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

Uppgift

Swipe to start coding

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

Lösning

Switch to desktopByt till skrivbordet för praktisk övningFortsätt där du är med ett av alternativen nedan
Var allt tydligt?

Hur kan vi förbättra det?

Tack för dina kommentarer!

Avsnitt 2. Kapitel 4
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book
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
copy

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

Uppgift

Swipe to start coding

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

Lösning

Switch to desktopByt till skrivbordet för praktisk övningFortsätt där du är med ett av alternativen nedan
Var allt tydligt?

Hur kan vi förbättra det?

Tack för dina kommentarer!

Avsnitt 2. Kapitel 4
Switch to desktopByt till skrivbordet för praktisk övningFortsätt där du är med ett av alternativen nedan
Vi beklagar att något gick fel. Vad hände?
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