sql获取12个月份各个月份订单数并返回为一个数组格式
时间: 2024-02-10 13:10:31 浏览: 69
好的,以下是获取12个月份各自的订单数并返回为一个数组格式的 SQL 语句:
```
SELECT MONTH(`order_date`) AS month_of_year, COUNT(*) AS order_count
FROM orders
GROUP BY MONTH(`order_date`)
```
这条 SQL 语句会查询订单表中所有月份的订单数据,并按照每个月份分组统计订单数量。返回的结果是一个数组,每个数组元素包含该月份和订单数量。注意,这里假设订单表的名称为 `orders`,日期字段为 `order_date`。
相关问题
sql获取12个月份各个月份订单数并返回为一个数组格式,当月没有订单数的返回0,返回的数组是12个数,分别代表着12个月份的订单数
可以使用以下 SQL 语句来获取12个月份各个月份订单数并返回为一个数组格式:
```
SELECT COALESCE(SUM(CASE WHEN MONTH(order_date) = 1 THEN 1 ELSE 0 END), 0) AS month1,
COALESCE(SUM(CASE WHEN MONTH(order_date) = 2 THEN 1 ELSE 0 END), 0) AS month2,
COALESCE(SUM(CASE WHEN MONTH(order_date) = 3 THEN 1 ELSE 0 END), 0) AS month3,
COALESCE(SUM(CASE WHEN MONTH(order_date) = 4 THEN 1 ELSE 0 END), 0) AS month4,
COALESCE(SUM(CASE WHEN MONTH(order_date) = 5 THEN 1 ELSE 0 END), 0) AS month5,
COALESCE(SUM(CASE WHEN MONTH(order_date) = 6 THEN 1 ELSE 0 END), 0) AS month6,
COALESCE(SUM(CASE WHEN MONTH(order_date) = 7 THEN 1 ELSE 0 END), 0) AS month7,
COALESCE(SUM(CASE WHEN MONTH(order_date) = 8 THEN 1 ELSE 0 END), 0) AS month8,
COALESCE(SUM(CASE WHEN MONTH(order_date) = 9 THEN 1 ELSE 0 END), 0) AS month9,
COALESCE(SUM(CASE WHEN MONTH(order_date) = 10 THEN 1 ELSE 0 END), 0) AS month10,
COALESCE(SUM(CASE WHEN MONTH(order_date) = 11 THEN 1 ELSE 0 END), 0) AS month11,
COALESCE(SUM(CASE WHEN MONTH(order_date) = 12 THEN 1 ELSE 0 END), 0) AS month12
FROM orders
WHERE order_date BETWEEN '2021-01-01' AND '2021-12-31'
```
这个 SQL 语句会在 `orders` 表中查找在 2021 年内的订单,并将它们按月份分组并计算每个月的订单数。如果当月没有订单,返回的值为 0。最后,这个 SQL 语句会返回一个包含 12 个数的数组,分别代表着 12 个月份的订单数。
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