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SQL Basics

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SELECTing certain columns

Let's dig into our database. This database has 9 columns:

  1. model - model of the car
  2. year - year of manufacture
  3. price - car price in Euros
  4. transmission - type of gearbox
  5. mileage - miles drove
  6. fueltype - engine fuel type
  7. tax - road tax
  8. mpg - miles per gallon
  9. enginesize - engine size in liters.

To extract certain columns you need to select them by their names, like:

SELECT column1, column2, column3
FROM table_name

              
12

            
SELECT column1, column2, column3
FROM table_name
copy

Please note, that SQL is also case-insensitive to column names, i.e. if the column has name id both notations id and ID will be interpreted the same.

Compito

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Extract columns model, year, and price from the audi_cars database.

Soluzione

SELECT model, year, price
FROM audi_cars

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Sezione 1. Capitolo 2

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