Why WHERE phone = NULL Returns Nothing in SQL
📰 Dev.to · Dechive
Learn why SQL queries with WHERE phone = NULL return no results and how to fix it
Action Steps
- Write a SQL query with WHERE phone = NULL to see the issue
- Use the IS NULL operator instead of = NULL to filter for missing values
- Test the difference between = NULL and IS NULL in your queries
- Apply the IS NULL operator to your existing queries to fix the issue
- Compare the results of = NULL and IS NULL to understand the difference
Who Needs to Know This
SQL developers and data analysts who work with databases can benefit from understanding this concept to write more effective queries
Key Insight
💡 In SQL, = NULL does not match missing values, use IS NULL instead
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🚨 SQL gotcha: WHERE phone = NULL returns nothing! Use IS NULL instead 🚨
Key Takeaways
Learn why SQL queries with WHERE phone = NULL return no results and how to fix it
Full Article
If you are new to SQL, this query can look perfectly reasonable at first: SELECT name FROM...
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