To combine data from a joined table using PostgreSQL aggregate functions, you can use the following steps:
For example, suppose you have two tables: customers and orders. You want to find the total amount of orders for each customer. You can use the following query:
SELECT customers.name, SUM(orders.amount) AS total_amount
FROM customers
INNER JOIN orders
ON customers.id = orders.customer_id
GROUP BY customers.name
This query joins the customers and orders tables on the customer_id column and groups the results by the customer's name. The SUM function is used to calculate the total amount of orders for each customer. The resulting table will have two columns: the customer's name and their total order amount.
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Asked: 2021-05-16 11:00:00 +0000
Seen: 12 times
Last updated: May 11 '21
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