选择最近10天的数据

Question

我想对条形图实施SQL查询，该条形图显示最近10天每天的交易量。 例如，我有这个表结构：

CREATE TABLE `payment_transactions` (
  `id` int(11) NOT NULL,
  `amount` int(11) DEFAULT NULL,
  `created_at` datetime DEFAULT NULL,
  PRIMARY KEY (`id`),
);

我需要得到以下示例结果（每天分组）：

Date       | Amount| Number of transactions per day |
11-11-2018 | 30    | 3                              |
11-12-2018 | 230   | 13                             |

我如何使用MariaDB来实现呢？

Answer 1

您只需要从日期中切除时间部分并按此分组：

SELECT DATE(created_at) AS Date, SUM(amount) AS Total_Amount, COUNT(*) AS Num_Transactions
FROM t
GROUP BY DATE(created_at)

要将结果限制为持续10天，请使用以下where子句：

-- 10 days including today
WHERE created_at >= CURRENT_DATE - INTERVAL 9 DAY
AND   created_at  < CURRENT_DATE + INTERVAL 1 DAY

-- 10 days excluding today
WHERE created_at >= CURRENT_DATE - INTERVAL 10 DAY
AND   created_at  < CURRENT_DATE

-- 10 days from current time
WHERE created_at  > CURRENT_TIMESTAMP - INTERVAL 10 DAY
AND   created_at <= CURRENT_TIMESTAMP

Answer 2

您可以在下面尝试

    select date(created_at) as cdate, sum(amount) as amount,count(id) as 
    nooftransaction
    from payment_transactions
    where date(created_at)>=date(now()- interval 10 day) and date(created_at)<date(now())
    group by date(created_at)