Question 1

Using SQL commands,multiple tables can be queried so that all the values from one table appear in the results,regardless of whether they have one or more corresponding values in the other table,by using the SQL ________ command.

Accepted Answer

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Question 2

A subquery is appropriate only if the final result contains only data from a single table.

Accepted Answer

A subquery is a query within a query. It is used to retrieve data from one or more tables and use the result as part of the main query. A subquery can be used to filter data, perform calculations, or retrieve data from multiple tables. However, a subquery is only appropriate if the final result contains only data from a single table. This is because a subquery cannot return data from multiple tables.

Question 3

Using SQL commands,multiple tables can be queried using either subqueries or ________.

Accepted Answer

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Question 4

Given the tables
STUDENT(StudentID,StudentName,AdvisorID)
ADVISOR(AdvisorID,AdvisorName,Office,Phone)
Which of the following SQL statements would be used to implant a join between the two tables?

Accepted Answer

The correct syntax for joining two tables is to use the JOIN keyword followed by the table name and the ON keyword to specify the column(s) to join on. In this case, we want to join the STUDENT and ADVISOR tables on the AdvisorID column, so the correct statement would be "WHERE STUDENT JOIN ADVISOR ON STUDENT.AdvisorID = ADVISOR.AdvisorID".

Question 5

Using standard SQL,unmatched rows will not appear in the result of a join.

Accepted Answer

In standard SQL, a join typically returns rows that have matching values in both tables involved in the join. Unmatched rows from either table do not appear in the result set unless a specific type of outer join (LEFT, RIGHT, or FULL) is used.

Question 6

Data from a maximum of three tables can be combined through the use of subqueries in SQL.

Accepted Answer

Subqueries in SQL can be used to combine data from more than three tables, as there is no inherent limit to the number of tables that can be involved in subqueries, allowing for complex queries involving multiple tables.

Question 7

A complete table,including both the table structure and any data in the table,can be removed from the database by using the SQL ________ command.

Accepted Answer

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Question 8

Compare and contrast subqueries and joins.

Accepted Answer

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Question 9

The basic idea of a join is to combine the contents of two or more relations into a new relation.

Accepted Answer

The statement is true. A join operation is used to combine the contents of two or more relations (tables) into a new relation based on a common attribute.

Question 10

Which of the following SQL commands would be used to remove only the data from a table named STUDENT while leaving the table structure intact?

Accepted Answer

The DELETE FROM command with the table name will only remove the data from the table and leave the table structure intact. The other options such as DROP TABLE will completely remove the table along with its structure.

Question 11

Microsoft Access SQL allows table structures to be modified by using the standard SQL ________ command.

Accepted Answer

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Question 12

The values of existing data can be removed from a table using the SQL ________ command,which can even be used to remove all the data in the table at one time.

Accepted Answer

The answer of The values of existing data can be...

Question 13

Which type of join,although not included in standard SQL,was created to allow unmatched rows to appear in the result of a join operation?

Accepted Answer

An outer join allows unmatched rows from one or both tables to appear in the result of a join operation. The options A, B, D, and E are not valid types of joins in SQL.

Question 14

Which of the following SQL commands would be used to remove both the data and the table structure of a table named STUDENT?

Accepted Answer

The DROP TABLE command is used to remove both the data and the table structure of a table in SQL. The correct syntax for removing a table is "DROP TABLE table_name;". Therefore, choice A is the correct answer as it uses the correct syntax to drop the table named STUDENT.

Choices B, C, D, and E are incorrect. 
-B) DELETE command is used to remove only data from the table, not the table structure itself.
-C) REMOVE command is not a valid SQL command and does not exist.
-D) SELECT command is used to retrieve data from a table, not to remove a table.
-E) DELETE command is used to remove data from a table, but not the table structure itself.

Question 15

The ________ statement removes all data from a table while leaving the table structure,and also resets any surrogate primary key values back to the starting point.

Accepted Answer

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Question 16

Existing tables in a database can be structurally modified by using the SQL ________ command.

Accepted Answer

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Question 17

The values of existing data can be modified using the SQL ________ command,which can be used to change several column values at once.

Accepted Answer