Tables 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

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

and


              12
            
SELECT table_name.column1, table_name.column2
FROM table_name

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

Tehtävä

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.

Ratkaisu

Vaihda työpöytään todellista harjoitusta vartenJatka siitä, missä olet käyttämällä jotakin alla olevista vaihtoehdoista

Oliko kaikki selvää?

Kiitos palautteestasi!

Osio 1. Luku 9

Tables 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

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

and


              12
            
SELECT table_name.column1, table_name.column2
FROM table_name

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

Tehtävä

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.

Ratkaisu

Vaihda työpöytään todellista harjoitusta vartenJatka siitä, missä olet käyttämällä jotakin alla olevista vaihtoehdoista

Oliko kaikki selvää?

Kiitos palautteestasi!

Osio 1. Luku 9

Vaihda työpöytään todellista harjoitusta vartenJatka siitä, missä olet käyttämällä jotakin alla olevista vaihtoehdoista