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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
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
copy

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

Uppgift

Swipe to start coding

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

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 4. Kapitel 1
toggle bottom row

book
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
copy

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

Uppgift

Swipe to start coding

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

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 4. Kapitel 1
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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