1z0-071 Exam Dumps | Which two statements are true about selecting related rows from two tables based on entity relationship

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Question 56/156

Which two statements are true about selecting related rows from two tables based on entity relationship diagram (ERD)?

A. Relating data from a table with data from the same table is implemented with a self join.

B. An inner join relates rows within the same table.

C. Rows from unrelated tables cannot be joined.

D. Implementing a relationship between two tables might require joining additional tables.

E. Every relationship between the two tables must be implemented in a Join condition.

Correct Answer: A,D

Understanding the functionality of SQL joins and their application in a relational database:
* Option A: Correct. A self join is used to relate or compare rows within the same table. It typically involves using table aliases to distinguish the different instances of the table in the query.
* Option B: Incorrect. An inner join relates rows between two different tables based on a common condition, not within the same table.
* Option C: Incorrect. SQL allows joining of rows from any tables, whether directly related by foreign keys or not, as long as there is a logical condition that can relate their columns.
* Option D: Correct. Sometimes establishing a relationship between two specific tables might require joining through one or more intermediary tables, particularly in cases involving complex relationships or normalization.
* Option E: Incorrect. While joins are often used to implement relationships, not every logical relationship necessitates a join condition, especially if data from only one table is required or if multiple relations are possible but not relevant to the specific query.

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