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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 in DESCending order

But what if we want to get the highest observation? As you remember, sorting in SQL is realized in ascending order, so the biggest values are on the bottom.

In SQL you can easily sort in reverse (descending) order. To do it use DESC keyword followed or preceded by column name. You can also put column names within the parenthesis of DESC keyword. So, there are two variants of using DESC:

  • DESC(col_name);
  • col_name DESC;

For example, we can order cars by mileage, but this time in descending order.


              
123

            
SELECT *
FROM audi_cars
ORDER BY mileage DESC
copy

Please note, that there is also ASC keyword in SQL used for ascending sorting. Since default sorting in SQL is in ascending order, this keyword is rarely used.

Opgave

Swipe to start coding

From the audi_cars table extract all the cars sorted by column tax in descending order.

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 2
toggle bottom row

book
Sorting in DESCending order

But what if we want to get the highest observation? As you remember, sorting in SQL is realized in ascending order, so the biggest values are on the bottom.

In SQL you can easily sort in reverse (descending) order. To do it use DESC keyword followed or preceded by column name. You can also put column names within the parenthesis of DESC keyword. So, there are two variants of using DESC:

  • DESC(col_name);
  • col_name DESC;

For example, we can order cars by mileage, but this time in descending order.


              
123

            
SELECT *
FROM audi_cars
ORDER BY mileage DESC
copy

Please note, that there is also ASC keyword in SQL used for ascending sorting. Since default sorting in SQL is in ascending order, this keyword is rarely used.

Opgave

Swipe to start coding

From the audi_cars table extract all the cars sorted by column tax in descending order.

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 2
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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