To answer this question, you need to understand the different DB tools and their functionalities. Let's go through each option to understand why it is correct or incorrect:

Option A) Task Center - Task Center is a tool used for managing and scheduling database tasks. It does not provide the functionality to execute SQL statements or view graphical representations of access plans. Therefore, this option is incorrect.

Option B) Command Editor - The Command Editor is a tool that allows users to execute SQL statements and view a graphical representation of the access plan. This tool is commonly used in database management systems (DBMS) to interact with the database. Therefore, this option is correct.

Option C) Developer Workbench - Developer Workbench is a tool that provides a graphical interface for developers to design, develop, and manage databases. However, it does not specifically mention the capability to execute SQL statements or view graphical representations of access plans. Therefore, this option is incorrect.

Option D) Command Line Processor - The Command Line Processor is a tool that allows users to execute SQL statements via a command-line interface. It does not provide a graphical representation of the access plan. Therefore, this option is incorrect.

The correct answer is Option B) Command Editor. This option is correct because it allows the user to execute an SQL statement and view a graphical representation of the access plan.

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To answer this question, you need to understand the different privileges and authorities needed to create a view that references tables.

Let's go through each option to understand why it is correct or incorrect:

Option A) CREATEIN privilege on the database - This option is incorrect because the CREATEIN privilege allows the user to create objects within a specified schema, but it does not grant the user the ability to reference tables or create views.

Option B) REFERENCES privilege on TAB1 and TAB2 - This option is incorrect because the REFERENCES privilege allows the user to create foreign key constraints that reference the specified tables, but it does not grant the user the ability to create views.

Option C) CREATE_TAB privilege on the database - This option is incorrect because the CREATE_TAB privilege does not exist in the context of creating views. It may be a made-up privilege or a misrepresentation of the actual privilege required.

Option D) SELECT privilege on TAB1 and TAB2 - This option is correct because the SELECT privilege allows the user to query the specified tables and retrieve data. When creating a view, the user needs to reference the tables and retrieve data from them, which requires the SELECT privilege.

Therefore, the correct answer is Option D. This option is correct because the SELECT privilege on TAB1 and TAB2 allows USER1 to create a view named VIEW1 that references the two tables.

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• Wrong explanation

To answer this question, you need to understand the concept of aliases and privileges in database management systems.

An alias is an alternative name given to a table or column in a database. It allows you to refer to the table or column by a different name in your queries, which can be helpful for simplifying or clarifying your code.

In this case, USER1 wants to utilize an alias to remove rows from a table. To do this, USER1 needs the DELETE privilege on the table. The DELETE privilege allows the user to delete rows from a table.

Let's go through each option to understand why it is correct or incorrect:

Option A) DELETE privilege on the table - This option is correct because USER1 needs the DELETE privilege on the table to remove rows from it.

Option B) DELETE privilege on the alias - This option is incorrect because privileges are granted on the underlying table, not on the alias. The alias is just a different name for the table and does not have its own set of privileges.

Option C) DELETE privilege on the alias; REFERENCES privilege on the table - This option is incorrect because, as mentioned earlier, privileges are granted on the underlying table, not on the alias. The REFERENCES privilege is used to create foreign key constraints, not for deleting rows.

Option D) REFERENCES privilege on the alias; DELETE privilege on the table - This option is incorrect for the same reasons as option C. The REFERENCES privilege is not needed for deleting rows, and privileges are granted on the underlying table, not on the alias.

Therefore, the correct answer is option A. USER1 needs the DELETE privilege on the table to remove rows from it.

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• Wrong explanation