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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

bookUnique values from column

In real life, you may work with big tables containing thousands of rows and lots of columns. For example, you may have a database with all the users who have visited your site, and you want to know all the countries that attended your site.

In SQL, to extract unique values from the column use the DISTINCT statement. For example, to extract unique countries from the table visitors use:


              
12

            
SELECT DISTINCT(country)
FROM visitors
copy

Task

From the audi_cars table extract all the unique models of cars.

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Everything was clear?

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Section 1. Chapter 4
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bookUnique values from column

In real life, you may work with big tables containing thousands of rows and lots of columns. For example, you may have a database with all the users who have visited your site, and you want to know all the countries that attended your site.

In SQL, to extract unique values from the column use the DISTINCT statement. For example, to extract unique countries from the table visitors use:


              
12

            
SELECT DISTINCT(country)
FROM visitors
copy

Task

From the audi_cars table extract all the unique models of cars.

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 1. Chapter 4
toggle bottom row

bookUnique values from column

In real life, you may work with big tables containing thousands of rows and lots of columns. For example, you may have a database with all the users who have visited your site, and you want to know all the countries that attended your site.

In SQL, to extract unique values from the column use the DISTINCT statement. For example, to extract unique countries from the table visitors use:


              
12

            
SELECT DISTINCT(country)
FROM visitors
copy

Task

From the audi_cars table extract all the unique models of cars.

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!

In real life, you may work with big tables containing thousands of rows and lots of columns. For example, you may have a database with all the users who have visited your site, and you want to know all the countries that attended your site.

In SQL, to extract unique values from the column use the DISTINCT statement. For example, to extract unique countries from the table visitors use:


              
12

            
SELECT DISTINCT(country)
FROM visitors
copy

Task

From the audi_cars table extract all the unique models of cars.

Switch to desktopSwitch to desktop for real-world practiceContinue from where you are using one of the options below
Section 1. Chapter 4
Switch to desktopSwitch to desktop for real-world practiceContinue from where you are using one of the options below
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