Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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You are writing a query about hospital encounters using the following FROM clause:

FROM PAT_ENC HSP peh
<join type> CLARITY_DEP dep ON peh.DEPARTMENT_ID = dep.DEPARTMENT_ID

DEPARTMENT_ID is never NULL in either table, and for every DEPARTMENT_ID in PAT_ENC_HSP, there is a matching DEPARTMENT_ID in CLARITY_DEP. Assuming no additional filtering, which join type must you use?

A. You must use either an INNER JOIN or a LEFT OUTER JOIN, and either would return the same results

B. You must use an INNER JOIN

C. You must use a LEFT OUTER JOIN

D. You must use a CROSS JOIN

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