NULL in PostgreSQL - Examples & AI Generator

Handling NULL values is a core SQL skill—but in PostgreSQL, getting the syntax right can be frustrating. Whether you’re switching from another database or learning new queries, NULL logic impacts how your data is selected, filtered, and calculated. Instead of memorizing syntax differences, AI2sql lets you generate production-ready NULL PostgreSQL queries in seconds, no coding required.

NULL Syntax in PostgreSQL

PostgreSQL treats NULL as a marker for missing, undefined, or unknown values. Standard operators (=, !=) don’t work with NULLs—instead, use dedicated keywords:

• IS NULL: Checks if a value is NULL

• IS NOT NULL: Checks if a value is present

• Use COALESCE to substitute NULLs with a default value

PostgreSQL-specific notes

• Comparisons like = NULL will always return false.

• Aggregate functions may ignore NULLs by default.

NULL Examples You Can Generate Instantly

• Find customers without an email address:

• Get orders where delivery date is set (not NULL):

• List products, setting missing descriptions to 'N/A':

Generate NULL queries in 10 seconds with AI2sql.

Why Use AI2sql Instead of Manual NULL Coding

• No more syntax errors: Instantly generate NULL PostgreSQL syntax from plain English.

• Speed: Get production-ready SQL for any business scenario in under 10 seconds.

• Adaptable: Supports PostgreSQL and other databases—no need to memorize different syntax.

• Trusted by 50,000+ users across 80+ countries.

Explore more features: Try AI2sql Generator or Learn NULL.

FAQ: NULL in PostgreSQL

• Q: Can I use = NULL in PostgreSQL?
  A: No. Always use IS NULL or IS NOT NULL for comparisons.

• Q: How do I replace NULL values in results?
  A: Use COALESCE(column, 'replacement') to display a default instead of NULL.

• Q: Does COUNT(*) include NULLs?
  A: Yes, but COUNT(column) only counts non-NULL values in that column.

Conclusion

Mastering NULL in PostgreSQL is essential for accurate data analysis—but you don’t need to memorize every rule. With AI2sql, generate error-free NULL queries for any scenario in just 10 seconds.
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