Have you used CTE? Tell me what it is.

A Common Table Expression (CTE) is a temporary result set that can be used within another SQL query. It improves the readability and structure of complex queries by allowing them to be broken into logical parts. In Go, I used CTEs when working with databases through SQL queries to simplify nested selections and recursive queries.

Example of a CTE in SQL:

WITH RecentOrders AS (
    SELECT * FROM orders WHERE order_date > CURRENT_DATE - INTERVAL '30 days'
)
SELECT customer_id, COUNT(*) FROM RecentOrders GROUP BY customer_id;

In Go, this is usually executed through standard libraries or ORM by passing such an SQL query for execution.