Which of the following can be used to view all the tables in memory?

tables
alltable
table
none of the mentioned

The correct answer is: SHOW TABLES.

The SHOW TABLES statement is used to list all the tables in a database. It can be used to view the tables in the current database, or to view the tables in a specific database.

The SHOW TABLES statement takes no arguments. The following is an example of the SHOW TABLES statement:

SHOW TABLES;

This statement will list all the tables in the current database.

The SHOW TABLES statement can also be used to view the tables in a specific database. To do this, you must specify the name of the database after the SHOW TABLES statement. The following is an example of the SHOW TABLES statement used to view the tables in the mydb database:

SHOW TABLES FROM mydb;

This statement will list all the tables in the mydb database.

The SHOW TABLES statement is a very useful tool for database administrators and developers. It can be used to quickly view the tables in a database, and to identify the tables that are being used.

The other options are incorrect because they are not valid SQL statements.