feat(leetcode/medium/2372-calculate-the-influence-of-each-salesperson.sql)

Author: polyglotm

coding-challange/leetcode/medium/2372-calculate-the-influence-of-each-salesperson/2372-calculate-the-influence-of-each-salesperson.sql

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+# leetcode/medium/2372. Calculate the Influence of Each Salesperson
+# 2372-calculate-the-influence-of-each-salesperson
+# URL: https://leetcode.com/problems/calculate-the-influence-of-each-salesperson/description/
+
+# Input:
+# Salesperson table:
+# +----------------+-------+
+# | salesperson_id | name  |
+# +----------------+-------+
+# | 1              | Alice |
+# | 2              | Bob   |
+# | 3              | Jerry |
+# +----------------+-------+
+# Customer table:
+# +-------------+----------------+
+# | customer_id | salesperson_id |
+# +-------------+----------------+
+# | 1           | 1              |
+# | 2           | 1              |
+# | 3           | 2              |
+# +-------------+----------------+
+# Sales table:
+# +---------+-------------+-------+
+# | sale_id | customer_id | price |
+# +---------+-------------+-------+
+# | 1       | 2           | 892   |
+# | 2       | 1           | 354   |
+# | 3       | 3           | 988   |
+# | 4       | 3           | 856   |
+# +---------+-------------+-------+
+# Output:
+# +----------------+-------+-------+
+# | salesperson_id | name  | total |
+# +----------------+-------+-------+
+# | 1              | Alice | 1246  |
+# | 2              | Bob   | 1844  |
+# | 3              | Jerry | 0     |
+# +----------------+-------+-------+
+
+SELECT s.salesperson_id, s.name, IFNULL(SUM(price), 0) AS total
+FROM Salesperson s
+         LEFT JOIN Customer c ON s.salesperson_id = c.salesperson_id
+         LEFT JOIN Sales s2 ON c.customer_id = s2.customer_id
+GROUP BY s.salesperson_id
+ORDER BY s.salesperson_id;