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SQL LEARNING SERIES PART-5

Complete SQL Topics for Data Analysis
-> https://t.me/sqlspecialist/523

Today, we will learn about Subqueries

Subqueries, also known as nested queries, allow you to use the result of one query within another query. There are different types of subqueries:

#### Subquery in SELECT:
Using a subquery to retrieve a single value.

SELECT column1, (SELECT column2 FROM table2 WHERE condition) AS subquery_result FROM table1;

#### Subquery in WHERE:
Filtering based on the result of a subquery.

SELECT column1 FROM table1 WHERE column2 = (SELECT column3 FROM table2 WHERE condition);

#### Subquery in HAVING:
Filtering aggregated results with a subquery.

SELECT column1, COUNT(column2) FROM table1 GROUP BY column1 HAVING COUNT(column2) > (SELECT threshold FROM settings);

Subqueries are useful for complex queries and can be employed in various parts of a statement.

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Hope it helps :)