Advanced SQL - General Questions (1)

Which of the following is true concerning triggers?

A.	You do not create them with SQL.
B.	They execute against only some applications that access a database.
C.	They have an event, condition, and action.
D.	They cannot cascade (cause another trigger to fire).

Answer: Option C

Explanation:

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The following SQL is which type of join: SELECT CUSTOMER_T. CUSTOMER_ID, ORDER_T. CUSTOMER_ID, NAME, ORDER_ID FROM CUSTOMER_T,ORDER_T ;

A.	Equi-join
B.	Natural join
C.	Outer join
D.	Cartesian join

Answer: Option D

Explanation:

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How many tables may be included with a join?

A.	One
B.	Two
C.	Three
D.	All of the above.

Answer: Option D

Explanation:

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Which of the following is a correlated subquery?

A.	Uses the result of an inner query to determine the processing of an outer query.
B.	Uses the result of an outer query to determine the processing of an inner query.
C.	Uses the result of an inner query to determine the processing of an inner query.
D.	Uses the result of an outer query to determine the processing of an outer query.

Answer: Option B

Explanation:

Correlated subquery references a column in the outer query and executes the subquery once for every row in the outer query while Uncorrelated subquery executes the subquery first and passes the value to the outer query.

Which of the following statements is true concerning subqueries?

A.	Involves the use of an inner and outer query.
B.	Cannot return the same result as a query that is not a subquery.
C.	Does not start with the word SELECT.
D.	All of the above.

Answer: Option A

Explanation:

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A UNION query is which of the following?

A.	Combines the output from no more than two queries and must include the same number of columns.
B.	Combines the output from no more than two queries and does not include the same number of columns.
C.	Combines the output from multiple queries and must include the same number of columns.
D.	Combines the output from multiple queries and does not include the same number of columns.

Answer: Option C

Explanation:

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Embedded SQL is which of the following?

A.	Hard-coded SQL statements in a program language such as Java.
B.	The process of making an application capable of generating specific SQL code on the fly.
C.	Hard-coded SQL statements in a procedure.
D.	Hard-coded SQL statements in a trigger.

Answer: Option A

Explanation:

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The following SQL is which type of join: SELECT CUSTOMER_T. CUSTOMER_ID, ORDER_T. CUSTOMER_ID, NAME, ORDER_ID FROM CUSTOMER_T,ORDER_T WHERE CUSTOMER_T. CUSTOMER_ID = ORDER_T. CUSTOMER_ID

A.	Equi-join
B.	Natural join
C.	Outer join
D.	Cartesian join

Answer: Option A

Explanation:

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Advanced SQL - General Questions (1)

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