Question

Which of the following is an example of assigning o as a table alias for the ORDERS table in the FROM clause?

a) SELECT * FROM ORDERS AS o;
b) SELECT * FROM o AS ORDERS;
c) SELECT * FROM ORDERS o;
d) SELECT * FROM ORDERS WITH ALIAS o;

Answer 1

The correct examples of table aliasing for the ORDERS table as 'o' are 'SELECT * FROM ORDERS AS o;' and 'SELECT * FROM ORDERS o;'. Both use SQL syntax to shorten the table name in the query.

Step-by-step explanation:

The example of assigning o as a table alias for the ORDERS table in the FROM clause is: a) SELECT * FROM ORDERS AS o; and c) SELECT * FROM ORDERS o;. Both syntaxes are commonly used in SQL to create a short form or alias for a table name that can be used elsewhere in the query to refer to the table. The second syntax is the use of an implicit alias, where the alias follows the table name without the AS keyword, and it is quite common in SQL query writing.

The correct example of assigning o as a table alias for the ORDERS table in the FROM clause is a) SELECT * FROM ORDERS AS o;

In this example, the AS keyword is used to assign o as the alias for the ORDERS table. The alias allows us to refer to the table using a shorter and more convenient name in the rest of the SQL statement.

For example, if we wanted to select all columns from the ORDERS table using the assigned alias o, we could write:

SELECT * FROM ORDERS AS o;