10. Min and max spend

easy

Instruction

  • Write a query to return the minimum and maximum customer total spend in June 2020.
  • For each customer, first calculate their total spend in June 2020.
  • Then use MIN, and MAX function to return the min and max customer spend .

Table: payment

Movie rental payment transactions table


   col_name   | col_type
--------------+--------------------------
 payment_id   | integer
 customer_id  | smallint
 staff_id     | smallint
 rental_id    | integer
 amount       | numeric
 payment_ts   | timestamp with time zone

Sample results


min_spend | max_spend
-----------+-----------
      0.99 |     52.90

Solution postgres

WITH cust_tot_amt AS (
    SELECT
        customer_id,	
        SUM(amount) AS tot_amt
    FROM payment
    WHERE DATE(payment_ts) >= '2020-06-01'
    AND DATE(payment_ts) <= '2020-06-30'
    GROUP BY customer_id
)
SELECT 
    MIN(tot_amt) AS min_spend, 
    MAX(tot_amt) AS max_spend
FROM cust_tot_amt;
    

Explanation

This query is trying to find the minimum and maximum amounts spent by customers on payments made between June 1st, 2020 and June 30th, 2020.

First, it creates a temporary table called "cust_tot_amt" that aggregates the total amount spent by each customer during the specified time period.

Then, the main query selects the minimum and maximum total amounts from the "cust_tot_amt" table, which gives us the desired result.

Overall, this query is useful for analyzing spending patterns of customers during a specific time period.

Last Submission postgres

Expected results



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