[英]FInd the total number of orders and total number of sales which are having sale value greater than 2000 in a single sql query
輸入數據:
Customer_ID order_number order_value
1 1 500
1 2 300
1 3 2400
1 4 2123
2 5 300
2 2 2400
Output 資料:
Customer ID no. of orders valuegt2000
1 4 2
2 2 1
如果您的 DBMS 支持,您可以使用CASE表達式。
此語句至少在 PostgreSQL 中運行良好:
select
customer_id as "customer id",
count(order_number) as "no. of orders",
sum(
case
when order_value > 2000 then 1
else 0
end
) as valuegt2000
from
my_table
group by
customer_id
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