[Solved] You ran this SQL command:ALTER TABLE Orders ADD CONSTRAINT FK_Orders_Customers FOREIGN KEY CustomerID REFERENCES Customers(CustomerID);But it returned a syntax error. What is the most probable cause? | SQL

SQL - Table Constraints

You ran this SQL command:
ALTER TABLE Orders ADD CONSTRAINT FK_Orders_Customers FOREIGN KEY CustomerID REFERENCES Customers(CustomerID);
But it returned a syntax error. What is the most probable cause?

AThe referenced table Customers does not exist

BThe FOREIGN KEY column list is missing parentheses around CustomerID

CThe constraint name FK_Orders_Customers is too long

DThe ALTER TABLE command cannot add foreign keys

Step-by-Step Solution

Solution:

Step 1: Review the syntax for adding a foreign key constraint
The FOREIGN KEY columns must be enclosed in parentheses.
Step 2: Identify the error in the command
The command uses FOREIGN KEY CustomerID without parentheses, causing a syntax error.
Final Answer:
The FOREIGN KEY column list is missing parentheses around CustomerID -> Option B
Quick Check:
Foreign key columns require parentheses [OK]

Quick Trick: Foreign key columns must be in parentheses [OK]

Common Mistakes:

MISTAKES

Omitting parentheses around foreign key columns
Assuming constraint name length causes syntax errors
Believing ALTER TABLE cannot add foreign keys

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You ran this SQL command:

Step 1: Review the syntax for adding a foreign key constraint

Step 2: Identify the error in the command

Final Answer:

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