Consider these tables: Orders(order_id, customer_id, date) Customers(customer_id, name, date) What is the main problem with using NATURAL JOIN on these tables?
AIt will join on both <code>customer_id</code> and <code>date</code>, possibly causing incorrect matches
BIt will cause a syntax error because of duplicate column names
CIt will ignore the <code>customer_id</code> column and join only on <code>date</code>
DIt will return no rows because columns have the same name
Step-by-Step Solution
Solution:
Step 1: Identify columns with same names in both tables
Both tables have customer_id and date columns.
Step 2: Understand NATURAL JOIN behavior
NATURAL JOIN joins on all columns with the same names, so it will join on both customer_id and date, which may cause unintended filtering or incorrect matches.
Final Answer:
It will join on both customer_id and date, possibly causing incorrect matches -> Option A
Quick Check:
NATURAL JOIN joins on all same-named columns, beware unintended matches [OK]
Quick Trick:Natural join joins on all same-named columns, watch for unintended matches [OK]
Common Mistakes:
MISTAKES
Thinking NATURAL JOIN causes syntax errors with duplicate columns
Assuming it joins only on one column
Believing it returns no rows due to same column names
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