1z0-071 Exam Dumps | Which two statements are true about the results of using the INTERSECT operator in compound queries?

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Question 62/139

Which two statements are true about the results of using the INTERSECT operator in compound queries?

A. Reversing the order of the intersected tables can sometimes affect the output.

B. Column names in each SELECT in the compound query can be different.

C. INTERSECT returns rows common to both sides of the compound query.

D. The number of columns in each SELECT in the compound query can be different.

E. INTERSECT ignores NULLs

Correct Answer: B,C

In Oracle Database 12c, the INTERSECT operator is used in compound queries to return only the rows that are common to both SELECT statements involved in the query. Here's a breakdown of why the correct answer is C:
* A: Incorrect. The order of the tables in an INTERSECT operation does not affect the output because INTERSECT returns only the common elements between the two queries. The operation is symmetric.
* B: Incorrect. While the column names themselves can differ between the two SELECT statements, the data types and the number of columns must match for INTERSECT to function correctly.
* C: Correct. INTERSECT returns the intersection of the results of the two queries, which includes only rows that are found in both result sets.
* D: Incorrect. The number of columns and their data types in each SELECT statement of the INTERSECT must be the same to avoid errors and to correctly perform the comparison.
* E: Incorrect. INTERSECT does not ignore NULLs; rows with NULL values in corresponding columns must exactly match (both sides having NULLs in the same column) to be included in the output.

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