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SQL Basics
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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

NOT like this!

Often situation when we know what we don't want to find. In the case of numeric value, you should already know, that there is <> sign in SQL which means not equal. This also works for non-numeric columns: you can easily set <> 'some word' condition. But what if we want to avoid multiple non-numeric values? Or avoid some pattern?

Of course, it's already solved! There is NOT statement in SQL, which can be used with LIKE and IN statements. For example, we can filter cars in audi_table so there won't be Q-series cars.


              
123

            
SELECT *
FROM audi_cars
WHERE model NOT LIKE 'Q%'
copy

Please note, that NOT should be placed before IN or LIKE, like in spelling.

Task

Extract all the cars from the audi_cars table except A3, A4, and Q3 models.

Task

Extract all the cars from the audi_cars table except A3, A4, and Q3 models.

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

Everything was clear?

Section 2. Chapter 7
toggle bottom row

NOT like this!

Often situation when we know what we don't want to find. In the case of numeric value, you should already know, that there is <> sign in SQL which means not equal. This also works for non-numeric columns: you can easily set <> 'some word' condition. But what if we want to avoid multiple non-numeric values? Or avoid some pattern?

Of course, it's already solved! There is NOT statement in SQL, which can be used with LIKE and IN statements. For example, we can filter cars in audi_table so there won't be Q-series cars.


              
123

            
SELECT *
FROM audi_cars
WHERE model NOT LIKE 'Q%'
copy

Please note, that NOT should be placed before IN or LIKE, like in spelling.

Task

Extract all the cars from the audi_cars table except A3, A4, and Q3 models.

Task

Extract all the cars from the audi_cars table except A3, A4, and Q3 models.

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

Everything was clear?

Section 2. Chapter 7
toggle bottom row

NOT like this!

Often situation when we know what we don't want to find. In the case of numeric value, you should already know, that there is <> sign in SQL which means not equal. This also works for non-numeric columns: you can easily set <> 'some word' condition. But what if we want to avoid multiple non-numeric values? Or avoid some pattern?

Of course, it's already solved! There is NOT statement in SQL, which can be used with LIKE and IN statements. For example, we can filter cars in audi_table so there won't be Q-series cars.


              
123

            
SELECT *
FROM audi_cars
WHERE model NOT LIKE 'Q%'
copy

Please note, that NOT should be placed before IN or LIKE, like in spelling.

Task

Extract all the cars from the audi_cars table except A3, A4, and Q3 models.

Task

Extract all the cars from the audi_cars table except A3, A4, and Q3 models.

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

Everything was clear?

Often situation when we know what we don't want to find. In the case of numeric value, you should already know, that there is <> sign in SQL which means not equal. This also works for non-numeric columns: you can easily set <> 'some word' condition. But what if we want to avoid multiple non-numeric values? Or avoid some pattern?

Of course, it's already solved! There is NOT statement in SQL, which can be used with LIKE and IN statements. For example, we can filter cars in audi_table so there won't be Q-series cars.


              
123

            
SELECT *
FROM audi_cars
WHERE model NOT LIKE 'Q%'
copy

Please note, that NOT should be placed before IN or LIKE, like in spelling.

Task

Extract all the cars from the audi_cars table except A3, A4, and Q3 models.

Switch to desktop for real-world practiceContinue from where you are using one of the options below
Section 2. Chapter 7
Switch to desktop for real-world practiceContinue from where you are using one of the options below
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