SQL - INNER JOIN
Which of the following is the correct syntax for an INNER JOIN between tables
Orders and Customers on customer_id using the ON clause?Which of the following is the correct syntax for an INNER JOIN between tables Orders and Customers on customer_id using the ON clause?
easy📝 Syntax Q3 of 15
Step-by-Step Solution
Solution:
Step 1: Check correct INNER JOIN syntax
INNER JOIN requires ON clause with matching columns; SELECT * FROM Orders INNER JOIN Customers ON Orders.customer_id = Customers.customer_id; uses correct syntax with matching customer_id columns.Step 2: Evaluate other options
SELECT * FROM Orders JOIN Customers WHERE Orders.customer_id = Customers.customer_id; uses WHERE instead of ON, which is incorrect syntax for JOIN condition. SELECT * FROM Orders INNER JOIN Customers USING customer_id; uses USING but only valid if both tables have exactly the same column name and is less explicit. SELECT * FROM Orders INNER JOIN Customers ON Orders.id = Customers.id; joins on wrong columns (id instead of customer_id).Final Answer:
SELECT * FROM Orders INNER JOIN Customers ON Orders.customer_id = Customers.customer_id; -> Option AQuick Check:
Correct INNER JOIN syntax uses ON with matching columns [OK]
Quick Trick: Use ON clause with matching columns for INNER JOIN [OK]
Common Mistakes:
MISTAKES- Using WHERE instead of ON for join condition
- Joining on wrong columns
- Confusing USING with ON syntax
Master "INNER JOIN" in SQL
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