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SQL Basics
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Conteúdo do Curso

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

bookWhat is grouping?

Grouping - is arranging observations into sub-groups based on unique values in some column. For example, we can group our audi_cars table by transmission column (contains 3 unique values). There will be observations within each subgroup. So, what's the point of grouping?

In SQL grouping is often used in pair with some aggregate function within SELECT. For example, we can calculate the average price for each transmission type.


              
123

            
SELECT AVG(price), transmission
FROM audi_cars
GROUP BY transmission
copy

This will return all the transmissions types with average prices within each group.

Tarefa

From the audi_cars table calculate the average price of each model. Round price to two decimals.

Switch to desktopMude para o desktop para praticar no mundo realContinue de onde você está usando uma das opções abaixo
Tudo estava claro?

Como podemos melhorá-lo?

Obrigado pelo seu feedback!

Seção 5. Capítulo 1
toggle bottom row

bookWhat is grouping?

Grouping - is arranging observations into sub-groups based on unique values in some column. For example, we can group our audi_cars table by transmission column (contains 3 unique values). There will be observations within each subgroup. So, what's the point of grouping?

In SQL grouping is often used in pair with some aggregate function within SELECT. For example, we can calculate the average price for each transmission type.


              
123

            
SELECT AVG(price), transmission
FROM audi_cars
GROUP BY transmission
copy

This will return all the transmissions types with average prices within each group.

Tarefa

From the audi_cars table calculate the average price of each model. Round price to two decimals.

Switch to desktopMude para o desktop para praticar no mundo realContinue de onde você está usando uma das opções abaixo
Tudo estava claro?

Como podemos melhorá-lo?

Obrigado pelo seu feedback!

Seção 5. Capítulo 1
toggle bottom row

bookWhat is grouping?

Grouping - is arranging observations into sub-groups based on unique values in some column. For example, we can group our audi_cars table by transmission column (contains 3 unique values). There will be observations within each subgroup. So, what's the point of grouping?

In SQL grouping is often used in pair with some aggregate function within SELECT. For example, we can calculate the average price for each transmission type.


              
123

            
SELECT AVG(price), transmission
FROM audi_cars
GROUP BY transmission
copy

This will return all the transmissions types with average prices within each group.

Tarefa

From the audi_cars table calculate the average price of each model. Round price to two decimals.

Switch to desktopMude para o desktop para praticar no mundo realContinue de onde você está usando uma das opções abaixo
Tudo estava claro?

Como podemos melhorá-lo?

Obrigado pelo seu feedback!

Grouping - is arranging observations into sub-groups based on unique values in some column. For example, we can group our audi_cars table by transmission column (contains 3 unique values). There will be observations within each subgroup. So, what's the point of grouping?

In SQL grouping is often used in pair with some aggregate function within SELECT. For example, we can calculate the average price for each transmission type.


              
123

            
SELECT AVG(price), transmission
FROM audi_cars
GROUP BY transmission
copy

This will return all the transmissions types with average prices within each group.

Tarefa

From the audi_cars table calculate the average price of each model. Round price to two decimals.

Switch to desktopMude para o desktop para praticar no mundo realContinue de onde você está usando uma das opções abaixo
Seção 5. Capítulo 1
Switch to desktopMude para o desktop para praticar no mundo realContinue de onde você está usando uma das opções abaixo
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