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SQL Basics
SQL Basics
What 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.
SELECT AVG(price), transmission FROM audi_cars GROUP BY transmission
This will return all the transmissions types with average prices within each group.
Swipe to start coding
From the audi_cars table calculate the average price of each model. Round price to two decimals.
Lösning
Byt till skrivbordet för praktisk övningFortsätt där du är med ett av alternativen nedanTack för dina kommentarer!
What 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.
SELECT AVG(price), transmission FROM audi_cars GROUP BY transmission
This will return all the transmissions types with average prices within each group.
Swipe to start coding
From the audi_cars table calculate the average price of each model. Round price to two decimals.
Lösning
Byt till skrivbordet för praktisk övningFortsätt där du är med ett av alternativen nedanTack för dina kommentarer!
Byt till skrivbordet för praktisk övningFortsätt där du är med ett av alternativen nedan