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This article mainly shows you "SQL how to achieve sub-query", the content is easy to understand, clear, hope to help you solve your doubts, the following let the editor lead you to study and learn "SQL how to achieve sub-query" this article.

1. Single-row subquery

2. Multi-row subquery

3. Multi-column subquery

Where (job,sal) = (select job,sal from emp where empno=123)

4. Related subquery

5. Paging query of result set

The above is all the contents of the article "how to implement subqueries in SQL". Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!

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