Alter Table

Lesson in the SQL Roadmap · Stage 5: Aggregate Queries

Last updated 14 September 2026

What is Alter Table?

The ALTER TABLE statement in SQL is used to modify the structure of an existing table. This includes adding, dropping, or modifying columns, changing the data type of a column, setting default values, and adding or dropping primary or foreign keys.

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Free resources to learn Alter Table

ArticleALTER TABLE Statement
ArticleALTER TABLE - PostgreSQL

Alter Table: common questions

Can I learn Alter Table 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 Alter Table 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 Alter Table tutorial for beginners?

It is lesson 34 of 112 in the free SQL roadmap, in stage 5, Aggregate Queries. 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.