Question

The From clause can contain a second name for a table. This name is called:

a) an alternate
b) an alias
c) also known as
d) aka

Answer 1

In SQL, a second name given to a table in the FROM clause is called an alias. An alias simplifies the query, enhances readability, and is useful in complex queries or when tables are joined, including self-joins.

Step-by-step explanation:

In the context of SQL and database queries, when the FROM clause contains a second name for a table, this name is referred to as b) an alias. An alias is used for convenience in the query to shorten the original table name or to improve readability, especially in queries involving multiple tables or subqueries. It can also be used to uniquely identify a table within a query if the same table is being joined to itself. For example, if we have a table named 'Employees', we could use an alias to refer to it like so:

SELECT emp.name FROM Employees AS emp;

Here, 'emp' acts as an alias for the 'Employees' table, allowing us to refer to it in a more succinct manner throughout the query.