Contenido del Curso
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.
Tarea
From the audi_cars table calculate the average price of each model. Round price to two decimals.
Tarea
From the audi_cars table calculate the average price of each model. Round price to two decimals.
Cambia al escritorio para practicar en el mundo realContinúe desde donde se encuentra utilizando una de las siguientes opciones¿Todo estuvo claro?
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.
Tarea
From the audi_cars table calculate the average price of each model. Round price to two decimals.
Tarea
From the audi_cars table calculate the average price of each model. Round price to two decimals.
Cambia al escritorio para practicar en el mundo realContinúe desde donde se encuentra utilizando una de las siguientes opciones¿Todo estuvo claro?
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.
Tarea
From the audi_cars table calculate the average price of each model. Round price to two decimals.
Tarea
From the audi_cars table calculate the average price of each model. Round price to two decimals.
Cambia al escritorio para practicar en el mundo realContinúe desde donde se encuentra utilizando una de las siguientes opciones¿Todo estuvo claro?
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.
Tarea
From the audi_cars table calculate the average price of each model. Round price to two decimals.
Cambia al escritorio para practicar en el mundo realContinúe desde donde se encuentra utilizando una de las siguientes opcionesCambia al escritorio para practicar en el mundo realContinúe desde donde se encuentra utilizando una de las siguientes opciones