Note: This question is part of a series of questions that use the same or similar answer choices. An
answer choice may be correct for more than one question in the series. Each question is independent
of the other questions in this series. Information and details provided in a question apply only to that
question.
You have a database that contains tables named Customer_CRMSystem and Customer_HRSystem. Both
tables use the following structure:
The tables include the following records:
Customer_CRMSystem

Customer_HRSystem

Records that contain null values for CustomerCode can be uniquely identified by CustomerName.
You need to create a list of all unique customers that appear in either table.
Which Transact-SQL statement should you run?

A.

B.

C.

D.

E.

F.

G.

H.

Explanation:
UNION combines the results of two or more queries into a single result set that includes all the rows that belong
to all queries in the union. The UNION operation is different from using joins that combine columns from two
tables.
Incorrect Answers:
F: UNION ALL incorporates all rows into the results. This includes duplicates. If not specified, duplicate rows
are removed.
https://msdn.microsoft.com/en-us/library/ms180026.aspx