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SQL Basics
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Kursusindhold

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
The cheapest car

Remember the task from the third section, where you calculated the maximum price of a Diesel car? What if we want to see not only the price, but also what model, mileage, and other characteristics of this car?

One of the ways to solve it - is using nested queries, but this is not the topic for this course. Easier, you can order your table in descending order and limit the number of rows to 1! For example,


              
12345

            
SELECT *
FROM audi_cars
WHERE fueltype = 'Diesel'
ORDER BY price DESC
LIMIT 1
copy

This query will return all the Diesel cars, ordered by price in descending order with only 1 row! This is the car we were looking for.

Opgave

Swipe to start coding

From the audi_cars table extract the information for the cheapest car with Semi-Auto transmission.

Løsning

Switch to desktopSkift til skrivebord for at øve i den virkelige verdenFortsæt der, hvor du er, med en af nedenstående muligheder
Var alt klart?

Hvordan kan vi forbedre det?

Tak for dine kommentarer!

Sektion 4. Kapitel 3
toggle bottom row

book
The cheapest car

Remember the task from the third section, where you calculated the maximum price of a Diesel car? What if we want to see not only the price, but also what model, mileage, and other characteristics of this car?

One of the ways to solve it - is using nested queries, but this is not the topic for this course. Easier, you can order your table in descending order and limit the number of rows to 1! For example,


              
12345

            
SELECT *
FROM audi_cars
WHERE fueltype = 'Diesel'
ORDER BY price DESC
LIMIT 1
copy

This query will return all the Diesel cars, ordered by price in descending order with only 1 row! This is the car we were looking for.

Opgave

Swipe to start coding

From the audi_cars table extract the information for the cheapest car with Semi-Auto transmission.

Løsning

Switch to desktopSkift til skrivebord for at øve i den virkelige verdenFortsæt der, hvor du er, med en af nedenstående muligheder
Var alt klart?

Hvordan kan vi forbedre det?

Tak for dine kommentarer!

Sektion 4. Kapitel 3
Switch to desktopSkift til skrivebord for at øve i den virkelige verdenFortsæt der, hvor du er, med en af nedenstående muligheder
Vi beklager, at noget gik galt. Hvad skete der?
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