COALESCE

Lesson in the SQL Roadmap · Stage 10: Views

Last updated 14 September 2026

What is COALESCE?

COALESCE is an SQL function that returns the first non-null value in a list of expressions. It's commonly used to handle null values or provide default values in queries. COALESCE evaluates its arguments in order and returns the first non-null result, making it useful for data cleaning, report generation, and simplifying complex conditional logic in SQL statements.

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Free resources to learn COALESCE

ArticleHow to use the COALESCE function in SQL
ArticleCOALESCE - PostgreSQL

COALESCE: common questions

Can I learn COALESCE in Hindi?

This lesson is written in English. Once you sign in, open it in the interactive course and ask the AI tutor to explain COALESCE in Hindi or Hinglish. The tutor answers from this lesson’s own text, so it stays on the syllabus, and it runs on your own Google, OpenAI or Anthropic key.

Is this COALESCE tutorial for beginners?

It is lesson 74 of 112 in the free SQL roadmap, in stage 10, Views. If you are new to SQL, start from stage 1 and come back here in order; if you already know the earlier stages, this lesson stands on its own.