Зміст курсу
SQL Basics
SQL Basics
Aliases
The outputs of the last two tasks were single columns with single values. If you noticed, this column had a name count, which is not, to be honest representative. Seems like it's only a matter of taste. But in the future, when you will work with multiple tables, will join one table to another, the same names will be a huge problem. Even from the point of interpreting the data.
In SQL you can easily declare a new name to a column by using AS statement. For example,
SELECT COUNT(DISTINCT(country)) AS "number of countries" FROM visitors
This query will return a single value in the single column named number of countries, which is much readable than count.
Please note, that the aliases you use must be placed within double-quotes. Using single quotes will result in SQL error!
Завдання
Extract unique types of fuel consumed by cars (column fueltype) and name this column as "Fuel type".
Завдання
Extract unique types of fuel consumed by cars (column fueltype) and name this column as "Fuel type".
Перейдіть на комп'ютер для реальної практикиПродовжуйте з того місця, де ви зупинились, використовуючи один з наведених нижче варіантівВсе було зрозуміло?
Aliases
The outputs of the last two tasks were single columns with single values. If you noticed, this column had a name count, which is not, to be honest representative. Seems like it's only a matter of taste. But in the future, when you will work with multiple tables, will join one table to another, the same names will be a huge problem. Even from the point of interpreting the data.
In SQL you can easily declare a new name to a column by using AS statement. For example,
SELECT COUNT(DISTINCT(country)) AS "number of countries" FROM visitors
This query will return a single value in the single column named number of countries, which is much readable than count.
Please note, that the aliases you use must be placed within double-quotes. Using single quotes will result in SQL error!
Завдання
Extract unique types of fuel consumed by cars (column fueltype) and name this column as "Fuel type".
Завдання
Extract unique types of fuel consumed by cars (column fueltype) and name this column as "Fuel type".
Перейдіть на комп'ютер для реальної практикиПродовжуйте з того місця, де ви зупинились, використовуючи один з наведених нижче варіантівВсе було зрозуміло?
Aliases
The outputs of the last two tasks were single columns with single values. If you noticed, this column had a name count, which is not, to be honest representative. Seems like it's only a matter of taste. But in the future, when you will work with multiple tables, will join one table to another, the same names will be a huge problem. Even from the point of interpreting the data.
In SQL you can easily declare a new name to a column by using AS statement. For example,
SELECT COUNT(DISTINCT(country)) AS "number of countries" FROM visitors
This query will return a single value in the single column named number of countries, which is much readable than count.
Please note, that the aliases you use must be placed within double-quotes. Using single quotes will result in SQL error!
Завдання
Extract unique types of fuel consumed by cars (column fueltype) and name this column as "Fuel type".
Завдання
Extract unique types of fuel consumed by cars (column fueltype) and name this column as "Fuel type".
Перейдіть на комп'ютер для реальної практикиПродовжуйте з того місця, де ви зупинились, використовуючи один з наведених нижче варіантівВсе було зрозуміло?
The outputs of the last two tasks were single columns with single values. If you noticed, this column had a name count, which is not, to be honest representative. Seems like it's only a matter of taste. But in the future, when you will work with multiple tables, will join one table to another, the same names will be a huge problem. Even from the point of interpreting the data.
In SQL you can easily declare a new name to a column by using AS statement. For example,
SELECT COUNT(DISTINCT(country)) AS "number of countries" FROM visitors
This query will return a single value in the single column named number of countries, which is much readable than count.
Please note, that the aliases you use must be placed within double-quotes. Using single quotes will result in SQL error!
Завдання
Extract unique types of fuel consumed by cars (column fueltype) and name this column as "Fuel type".
Перейдіть на комп'ютер для реальної практикиПродовжуйте з того місця, де ви зупинились, використовуючи один з наведених нижче варіантівПерейдіть на комп'ютер для реальної практикиПродовжуйте з того місця, де ви зупинились, використовуючи один з наведених нижче варіантів