Which of the following SQL JOIN statements correctly joins table Orders with Customers on the primary key CustomerID and foreign key CustomerID?

easy📝 Syntax Q12 of 15

SQL - INNER JOIN

Which of the following SQL JOIN statements correctly joins table Orders with Customers on the primary key CustomerID and foreign key CustomerID?

ASELECT * FROM Orders JOIN Customers ON Orders.OrderID = Customers.CustomerID;

BSELECT * FROM Orders JOIN Customers ON Orders.OrderDate = Customers.CustomerID;

CSELECT * FROM Orders JOIN Customers ON Orders.CustomerID = Customers.OrderID;

DSELECT * FROM Orders JOIN Customers ON Orders.CustomerID = Customers.CustomerID;

Step-by-Step Solution

Solution:

Step 1: Identify correct keys for join
The primary key in Customers is CustomerID, and Orders has CustomerID as foreign key.
Step 2: Match keys in JOIN condition
The join must be ON Orders.CustomerID = Customers.CustomerID to link related records.
Final Answer:
SELECT * FROM Orders JOIN Customers ON Orders.CustomerID = Customers.CustomerID; -> Option D
Quick Check:
Join on matching CustomerID keys = SELECT * FROM Orders JOIN Customers ON Orders.CustomerID = Customers.CustomerID; [OK]

Quick Trick: Join ON foreign key = primary key column names [OK]

Common Mistakes:

MISTAKES

Mixing up primary and foreign key columns
Joining on unrelated columns like OrderDate
Using wrong table columns in ON clause

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Which of the following SQL JOIN statements correctly joins table Orders with Customers on the primary key CustomerID and foreign key CustomerID?

Step 1: Identify correct keys for join

Step 2: Match keys in JOIN condition

Final Answer:

Quick Check:

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