How to use Subqueries In SQL
Here, We are creating a SQL query that calculates the total price of products in each category from the sales
table using a subquery. The query should then select the category and total price from the subquery.
SELECT category, total_price
FROM (SELECT category, SUM(price) AS total_price
FROM sales
GROUP BY category) AS subquery;
Output:
How to Fix the “must appear in the GROUP BY clause” Error in PostgreSQL?
PostgreSQL is a powerful open–source relational database management system known for its robust features and reliability. However, like any database system, users may encounter errors during query execution. One common error is the “must appear in the GROUP BY clause” error.
In this article, We will learn about How to Fix the “must appear in the GROUP BY clause” Error in PostgreSQL by understanding various methods along with the practical implementation and so on.