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SQL Basics

bookTables aliases

As for columns, you can also assign some alias to the table name. It is very useful when you work with multiple tables at once, as they may have identical names.

To assign an alias to a table name use the same syntax as for columns. For example,


              
12

            
SELECT column1, column2
FROM table_name AS t
copy

With this technique, you can refer to certain columns by using alias.column. It also works for the whole table name. For example,


              
12

            
SELECT t.column1, t.column2
FROM table_name AS t
copy

and


              
12

            
SELECT table_name.column1, table_name.column2
FROM table_name
copy

queries will return the same result. It's all about usability.

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Extract columns model, price, fueltype, and mpg from audi_cars table. Use a alias for the table and extract columns using this alias. Print first 10 rows.

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bookTables aliases

As for columns, you can also assign some alias to the table name. It is very useful when you work with multiple tables at once, as they may have identical names.

To assign an alias to a table name use the same syntax as for columns. For example,


              
12

            
SELECT column1, column2
FROM table_name AS t
copy

With this technique, you can refer to certain columns by using alias.column. It also works for the whole table name. For example,


              
12

            
SELECT t.column1, t.column2
FROM table_name AS t
copy

and


              
12

            
SELECT table_name.column1, table_name.column2
FROM table_name
copy

queries will return the same result. It's all about usability.

Opgave

Swipe to start coding

Extract columns model, price, fueltype, and mpg from audi_cars table. Use a alias for the table and extract columns using this alias. Print first 10 rows.

Løsning

Switch to desktopSkift til skrivebord for at øve i den virkelige verdenFortsæt der, hvor du er, med en af nedenstående muligheder
Var alt klart?

Hvordan kan vi forbedre det?

Tak for dine kommentarer!

Sektion 1. Kapitel 9
single

single

close

Awesome!

Completion rate improved to 2.63

bookTables aliases

Stryg for at vise menuen

As for columns, you can also assign some alias to the table name. It is very useful when you work with multiple tables at once, as they may have identical names.

To assign an alias to a table name use the same syntax as for columns. For example,


              
12

            
SELECT column1, column2
FROM table_name AS t
copy

With this technique, you can refer to certain columns by using alias.column. It also works for the whole table name. For example,


              
12

            
SELECT t.column1, t.column2
FROM table_name AS t
copy

and


              
12

            
SELECT table_name.column1, table_name.column2
FROM table_name
copy

queries will return the same result. It's all about usability.

Opgave

Swipe to start coding

Extract columns model, price, fueltype, and mpg from audi_cars table. Use a alias for the table and extract columns using this alias. Print first 10 rows.

Løsning

Switch to desktopSkift til skrivebord for at øve i den virkelige verdenFortsæt der, hvor du er, med en af nedenstående muligheder
Var alt klart?

Hvordan kan vi forbedre det?

Tak for dine kommentarer!

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