SQL 如何将数据分组到单独的月份列中

Question

所以我运行这个查询是为了获取客户的姓名、订购的总金额以及他们提交的订单数量。通过这个查询，我得到了他们从三月到七月的整个历史，我想要的是名称，三月总金额/订单数量，四月总金额/订单数量，可能总金额/订单数量，.....等等


SELECT customer_name,MONTH(created_on), SUM(amount), COUNT(order_id)
FROM customer_orders
WHERE created_on BETWEEN '2020-03-01' AND '2020-08-01' 
GROUP BY customer_name, MONTH(created_on)

Answer 1

如果您想要单独的列中的值，则使用条件聚合：

SELECT customer_name,
       SUM(CASE WHEN MONTH(created_on) = 3 THEN amount END) as march_amount,
       SUM(CASE WHEN MONTH(created_on) = 3 THEN 1 ELSE 0 END) as march_count,
       SUM(CASE WHEN MONTH(created_on) = 4 THEN amount END) as april_amount,
       SUM(CASE WHEN MONTH(created_on) = 4 THEN 1 ELSE 0 END) as april_count,
       . . .
FROM customer_orders
WHERE created_on >= '2020-03-01' AND
      created_on < '2020-08-01' 
GROUP BY customer_name;

请注意，我更改了日期过滤器，因此它不包括 2020-08-01。

SQL 如何将数据分组到单独的月份列中

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