Questions
BU.330.770.T2.FA25 Quiz 2- Requires Respondus LockDown Browser
Single choice
What is the correct SQL statement to add a ๐น ๐ ๐ ๐ธ ๐ผ ๐บ ๐ ๐พ ๐ธ ๐ constraint named ๐น ๐พ ๐ ๐ ๐ ๐ ๐ ๐ ๐ถ ๐ข ๐ โ ๐ ๐ ๐ ๐ on the ๐ถ ๐ข ๐ โ ๐ ๐ ๐ ๐ผ ๐ท column in the ๐ ๐ ๐ ๐ ๐ ๐ table, referencing the ๐ถ ๐ข ๐ โ ๐ ๐ ๐ ๐ผ ๐ท column in the ๐ถ ๐ข ๐ โ ๐ ๐ ๐ ๐ table?
Options
A.ALTER TABLE Orders ADD FOREIGN KEY (CustomerID)
REFERENCES Customers(CustomerID);
B.ALTER TABLE Orders ADD CONSTRAINT FK_Orders_Customers
REFERENCES Customers(CustomerID);
C.CREATE FOREIGN KEY FK_Orders_Customers ON Orders(CustomerID)
REFERENCES Customers(CustomerID);
D.ALTER TABLE Orders ADD CONSTRAINT FK_Orders_Customers FOREIGN KEY (CustomerID)
REFERENCES Customers(CustomerID);
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Step-by-Step Analysis
To determine the correct SQL statement for adding a foreign key constraint, I will evaluate each option step by step.
Option 1: 'ALTER TABLE Orders ADD FOREIGN KEY (CustomerID)\n\nREFERENCES Customers(CustomerID);' This statement is missing the 'CONSTRAINT <name>' clause, and while some RDBMSs allow 'ADD FOREIGN KEY' in isolation, the standard and most common syntax requires naming the constraint with 'ADD CONSTRAINT ......Login to view full explanationLog in for full answers
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