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How to Use the COALESCE() Function in SQL (With Examples)
Learn how to use the SQL COALESCE() function to handle null values, combine columns, and clean up your data with real-world examples and tips.
Updated Mar 27, 2025 · 5 min read
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Run codeAssociate Data Engineer in SQL
Gain practical knowledge in ETL, SQL, and data warehousing for data engineering.
What happens if all values in COALESCE() are NULL?
How is COALESCE() different from ISNULL() or IFNULL()?
Can I use COALESCE() with expressions or functions?
Is there a performance cost to using COALESCE()?
Does COALESCE() work with different data types?
Can I nest COALESCE() functions?
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