Which of the following is a potential problem when a new column with the same name is added to both tables used in a NATURAL JOIN?

easy📝 Conceptual Q2 of 15

PostgreSQL - Joins in PostgreSQL

Which of the following is a potential problem when a new column with the same name is added to both tables used in a NATURAL JOIN?

AThe join will fail with a syntax error.

BThe join will ignore the new column automatically.

CThe join will only use the first matching column.

DThe join may include unintended columns in the join condition.

Step-by-Step Solution

Solution:

Step 1: Recall how NATURAL JOIN uses column names
NATURAL JOIN uses all columns with the same name as join keys.
Step 2: Consider adding a new same-named column
If a new column with the same name is added to both tables, it will be included in the join condition automatically, possibly causing unexpected results.
Final Answer:
The join may include unintended columns in the join condition. -> Option D
Quick Check:
New same-named column = unintended join keys [OK]

Quick Trick: New same-named columns affect NATURAL JOIN keys automatically [OK]

Common Mistakes:

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