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SQL Basics
course content

Course Content

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

bookSorting by multiple columns

Can we sort by multiple columns at once? And what does it mean? Assume, we firstly sort by one column. If there are some matches in this column, then sorting by another column will sort within this sub-group.

To make SQL sort by multiple columns at once just write ORDER BY followed by column names you want to sort by separated with a comma. For example, we can sort the entire audi_cars table firstly by engine size (enginesize) in descending order and then by price in ascending.


              
123

            
SELECT *
FROM audi_cars
ORDER BY enginesize DESC, price
copy

Task

Sort audi_cars table by mileage in ascending order and then by price in descending order.

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 4. Chapter 4
toggle bottom row

bookSorting by multiple columns

Can we sort by multiple columns at once? And what does it mean? Assume, we firstly sort by one column. If there are some matches in this column, then sorting by another column will sort within this sub-group.

To make SQL sort by multiple columns at once just write ORDER BY followed by column names you want to sort by separated with a comma. For example, we can sort the entire audi_cars table firstly by engine size (enginesize) in descending order and then by price in ascending.


              
123

            
SELECT *
FROM audi_cars
ORDER BY enginesize DESC, price
copy

Task

Sort audi_cars table by mileage in ascending order and then by price in descending order.

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 4. Chapter 4
toggle bottom row

bookSorting by multiple columns

Can we sort by multiple columns at once? And what does it mean? Assume, we firstly sort by one column. If there are some matches in this column, then sorting by another column will sort within this sub-group.

To make SQL sort by multiple columns at once just write ORDER BY followed by column names you want to sort by separated with a comma. For example, we can sort the entire audi_cars table firstly by engine size (enginesize) in descending order and then by price in ascending.


              
123

            
SELECT *
FROM audi_cars
ORDER BY enginesize DESC, price
copy

Task

Sort audi_cars table by mileage in ascending order and then by price in descending order.

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!

Can we sort by multiple columns at once? And what does it mean? Assume, we firstly sort by one column. If there are some matches in this column, then sorting by another column will sort within this sub-group.

To make SQL sort by multiple columns at once just write ORDER BY followed by column names you want to sort by separated with a comma. For example, we can sort the entire audi_cars table firstly by engine size (enginesize) in descending order and then by price in ascending.


              
123

            
SELECT *
FROM audi_cars
ORDER BY enginesize DESC, price
copy

Task

Sort audi_cars table by mileage in ascending order and then by price in descending order.

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