CREATE OR REPLACE VIEW employee_sales_totals AS
SELECT
e.*,
SUM(p.total_sale_value) AS total_sale_value
FROM
Employee e
INNER JOIN
Payment p
ON p.employee_number = e.employee_number
GROUP BY
e.id -- This should be the Primary Key / Surrogate Key of the employee table
;
CREATE OR REPLACE VIEW shop_top_employee_by_sales_value AS
SELECT
s.storename AS "Store",
e.employee_name AS "Employee",
m.employee_name AS "Manager",
p.total_sale_value AS "Sales Value"
FROM
(
SELECT storeid, MAX(total_sale_value) AS total_sale_value
FROM employee_sales_totals
GROUP BY storeid
)
p
INNER JOIN
employee_sales_totals e
ON e.storeid = p.storeid
AND e.total_sale_value = p.total_sale_value
INNER JOIN
fss_Shop s
ON s.storeid = e.storeid
INNER JOIN
Employee m
ON m.employee_number = e.manager_number
;
Secondo la risposta alla tua domanda precedente, se più dipendenti sono legati per lo stesso importo totale delle vendite nello stesso negozio, tutti questi dipendenti verrebbero restituiti.
