Which Transact-SQL statement should you run?

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:



Records that contain null values for CustomerCode can be uniquely identified by CustomerName. You need to display customers who appear in both tables and have a proper CustomerCode.

Which Transact-SQL statement should you run?
A .

B .

C .

D .

E .

Answer: A


When there are null values in the columns of the tables being joined, the null values do not match each other. The presence of null values in a column from one of the tables being joined can be returned only by using an outer join (unless the WHERE clause excludes null values).

References: https://technet.microsoft.com/en-us/library/ms190409(v=sql.105).aspx

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