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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

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Challenge: Relation between engine size and fuel consumption

Task

Swipe to start coding

From the audi_cars table calculate the average fuel consumption (mpg column) for each engine size (enginesize). Order results in descending order by the average value of mpg. Expected output: enginesize | average mpg.

Solution

The result may seem strange, but don't forget that the mpg column refers to miles per gallon. The greater this value, the less fuel car consumes.

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Section 6. Chapter 4
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book
Challenge: Relation between engine size and fuel consumption

Task

Swipe to start coding

From the audi_cars table calculate the average fuel consumption (mpg column) for each engine size (enginesize). Order results in descending order by the average value of mpg. Expected output: enginesize | average mpg.

Solution

The result may seem strange, but don't forget that the mpg column refers to miles per gallon. The greater this value, the less fuel car consumes.

Switch to desktopSwitch to desktop for real-world practiceContinue from where you are using one of the options below
Everything was clear?

How can we improve it?

Thanks for your feedback!

Section 6. Chapter 4
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