<prompt> Tuseme una meza inayoitwa amri na nguzo order_id, mteja_id, order_date, na kiasi. Andika SQL query kupata wastani wa idadi ya siku kati ya amri ya kwanza na ya pili ya mteja.  <response>: Heres the SQL query to find the average number of days between a customers first and second orders:SELECT AVGDATEDIFFsecond_order.order_date, first_order.order_dateFROM SELECT customer_id, MINorder_date AS first_order_date FROM orders GROUP BY customer_id AS first_orderJOIN SELECT customer_id, MINorder_date AS second_order_date FROM orders WHERE order_date SELECT MINorder_date FROM orders WHERE customer_id orders.customer_id GROUP BY customer_id AS second_order ON first_order.customer_id second_order.customer_idSteps:- The subquery first_order gets the first order date for each customer.- The subquery second_order gets the second order date for each customer by filtering out the first order and getting the minimum order date.- The two subqueries are joined on customer_id to get the time difference between the first and second orders.- Finally, the AVG function is used to get the average number of days between a customers first and second orders. 