Question

Identify the statement that correctly utilizes aliases.

a.) SELECT id, , FROM track AS t JOIN genre AS g USING (genre_id);

b.) SELECT id, , FROM track AS t JOIN genre AS g USING (genre_id);

c.) SELECT id, name AS track_name, name AS genre_name FROM track AS t JOIN genre AS g USING (genre_id);

d.) SELECT id, name FROM track AS t JOIN genre AS g USING (genre_id);

Answer 1

Statement c.) correctly uses aliases to differentiate between the 'name' column of 'track' and 'genre' tables by renaming them as 'track_name' and 'genre_name' respectively.

Step-by-step explanation:

The statement that correctly utilizes aliases is c.) SELECT id, name AS track_name, name AS genre_name FROM track AS t JOIN genre AS g USING (genre_id). This is because it uses the AS keyword to give a new name, or alias, to the columns being selected, which is useful especially when there are columns with the same name in different tables.

This helps to distinguish between columns when they are returned in the result set. In this statement, 'track_name' is the alias given to the 'name' column from the 'track' table, and 'genre_name' is the alias for the 'name' column from the 'genre' table.

Utilizing aliases like this ensures that there's no ambiguity in the result set, particularly after joining tables that may have columns with identical names.

The statement that correctly utilizes aliases is option c.) SELECT id, name AS track_name, name AS genre_name FROM track AS t JOIN genre AS g USING (genre_id). Aliases in SQL are used to give a table or a column a temporary name, making the query more readable and concise.

In this statement, the aliases 't' and 'g' are used for the 'track' and 'genre' tables respectively, while the 'AS' keyword is used to give the column 'name' different temporary names 'track_name' and 'genre_name'.