b$)$ CASCADE

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Explanation

Generated by AI

Foreign key constraints are used in databases to maintain the integrity of the data. They define the actions that should be performed when a referenced key is modified.

a$)$ NO ACTION: This is a foreign key constraint. It specifies that if a referenced row is deleted or modified, no action should be taken.

b$)$ CASCADE: This is not a foreign key constraint. It's an action that a foreign key constraint can specify. It means that if a referenced row is deleted or modified, all rows containing its foreign key are also deleted or modified.

c$)$ SET NULL: This is a foreign key constraint. It specifies that if a referenced row is deleted or modified, the foreign key in all rows referencing it should be set to NULL.

d$)$ All of the mentioned: This is not a foreign key constraint but a choice in the question.

So$,$ the correct answer is b$)$ CASCADE, as it's an action that a foreign key constraint can specify, not a foreign key constraint itself.

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Sources & relevant documents

$1$

filrs$19.$docx

$2$

Assignment Questions DBMS$.$docx

$3$

$117591093-$PLSQL$-$interview$-$questions.pdf

$4$

chapter$5\_$database constraints.pdf

$5$

SQL Constraints.docx