Which ON DELETE action keeps child rows but nulls their foreign key when the parent is removed?

Problem Statement

Explanation

SET NULL preserves the child record but clears the foreign key, which is valid only if the column allows NULL. CASCADE deletes the children, RESTRICT/NO ACTION prevents the parent delete when children exist.

Code Solution

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customer_id BIGINT REFERENCES customers(id) ON DELETE SET NULL

Practice Sets

This question appears in the following practice sets:

Constraints, Keys & Data Integrity

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Which ON DELETE action keeps child rows but nulls their foreign key when the parent is removed?

Problem Statement

Explanation

Code Solution

Practice Sets

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Master Interviews Anywhere, Anytime

Which ON DELETE action keeps child rows but nulls their foreign key when the parent is removed?

Problem Statement

Explanation

Code Solution

Practice Sets

Related Questions

Which SQL statement retrieves all columns and rows from a table named employees?

Which clause filters rows before aggregation and affects which rows are grouped?

What is the default sort order when ORDER BY is used without ASC or DESC?

Which construct is commonly used to paginate results in SQL engines like Postgres and MySQL?

Which predicate correctly checks for missing values in standard SQL?

More from SQL & Databases

Master Interviews
Anywhere, Anytime