如何在SQL查询中选择年和月的组合？

我需要一些SQL查询方面的帮助，我需要找到我感兴趣的所有可能的年和月的组合。下面是我对它的看法，

o.orderdate

的类型是

DATETIME

SELECT 
    o.orderdate
FROM
    Sales.Orders o
WHERE  
    (YEAR(o.orderdate) IN (2007, 2008))
    AND (MONTH(o.orderid) IN (1, 2, 3))
ORDER BY 
    o.orderdate;

我得到的结果是，在这里我们可以看到没有选择月份

2007-07-08 00:00:00.000
2007-07-09 00:00:00.000
2007-07-09 00:00:00.000
2007-07-10 00:00:00.000
2007-07-11 00:00:00.000
2007-07-11 00:00:00.000
2007-07-14 00:00:00.000
2007-07-15 00:00:00.000
2007-07-16 00:00:00.000
2007-07-16 00:00:00.000
2007-07-17 00:00:00.000
2007-07-18 00:00:00.000
2007-07-18 00:00:00.000
2007-07-21 00:00:00.000
2007-07-22 00:00:00.000
2007-07-22 00:00:00.000
2007-07-23 00:00:00.000
2007-07-24 00:00:00.000
2007-07-25 00:00:00.000
2007-07-25 00:00:00.000
2007-07-28 00:00:00.000
2007-07-29 00:00:00.000
2007-07-29 00:00:00.000
2007-07-30 00:00:00.000
2007-07-31 00:00:00.000
2007-07-31 00:00:00.000
2007-08-01 00:00:00.000
2007-08-04 00:00:00.000
2007-08-05 00:00:00.000
2007-08-05 00:00:00.000
2007-08-06 00:00:00.000
2007-08-07 00:00:00.000
2007-08-07 00:00:00.000
2007-08-08 00:00:00.000
2007-08-11 00:00:00.000
2007-08-11 00:00:00.000
2007-08-12 00:00:00.000
2007-08-12 00:00:00.000
2007-08-13 00:00:00.000
2007-08-14 00:00:00.000

---

它是否应该是

orderdate

而不是

orderid

SELECT
o.orderdate
FROM Sales.Orders o
WHERE (YEAR(o.orderdate) IN (2007, 2008))
  AND (MONTH(o.orderdate) IN (1, 2, 3))
ORDER BY o.orderdate;

---

您在MONTH（）函数中输入了错误的参数

SELECT
  o.orderdate
FROM Sales.Orders o
WHERE (YEAR(o.orderdate) IN (2007, 2008))
  AND (MONTH(o.orderdate) IN (1, 2, 3))
 ORDER BY o.orderdate;

或者，若要选择日期范围内的日期，最佳做法是使用完整日期

SELECT
  o.orderdate
FROM Sales.Orders o
WHERE (o.orderdate < '2007-01-01' AND o.orderdate < '2007-03-01')
  OR (o.orderdate < '2008-01-01' AND o.orderdate < '2008-03-01')
 ORDER BY o.orderdate;

选择
o、 订单日期
来自销售订单
其中（订单日期<'2007-01-01'和订单日期<'2007-03-01'）
或（订单日期<'2008-01-01'和订单日期<'2008-03-01'）
按o.orderdate订购；

可能是因为您使用的是

MONTH（Orderid）

而不是

MONTH（OrderDate）

？

（MONTH（o.Orderid）

？？天哪，我完全错过了：/无论如何，我不能再删除它了，因为它有答案