What is the safest pattern to update or delete rows in production?

Problem Statement

Explanation

Preview the effect with a SELECT using the same predicate. Then run the UPDATE or DELETE. Consider transactions and backups when touching many rows. Cascades may propagate changes across tables.

Code Solution

SolutionRead Only

-- preview
SELECT * FROM orders WHERE status='CANCELLED';
-- then
DELETE FROM orders WHERE status='CANCELLED';

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This question appears in the following practice sets:

SQL Core Fundamentals

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What is the safest pattern to update or delete rows in production?

Problem Statement

Explanation

Code Solution

Practice Sets

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

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Master Interviews Anywhere, Anytime

What is the safest pattern to update or delete rows in production?

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