SQL多日期查询

我正在处理一个查询，其中我必须找到一个零件上的3个或更多订单，该零件将有多个日期范围。我遇到的问题是，查询看起来并不是专门查看日期范围……而是查看完整的日期范围

 SELECT partnumber, count(orders.partorderid) as numberoforders 
 FROM orders
 WHERE(orderdate between '2013-10-07' and '2013-10-13') or (orderdate between '2013-10-14' and '2013-10-20')
 GROUP BY partnumber
 HAVING COUNT(partorderid) > 2  

查询返回10/07-10/20之间的numberoforders，而不是10/07-10/13和10/14-10/20之间的numberoforders？？？

尝试以下操作：

SELECT partnumber,
    SUM(CASE WHEN orderdate BETWEEN '2013-10-07' and '2013-10-13' THEN 1 END) week1,
    SUM(CASE WHEN orderdate BETWEEN '2013-10-14' and '2013-10-20' THEN 1 END) week2
FROM orders
GROUP BY partnumber
HAVING SUM(CASE WHEN orderdate BETWEEN '2013-10-07' and '2013-10-13' THEN 1 END) > 2
    AND SUM(CASE WHEN orderdate BETWEEN '2013-10-14' and '2013-10-20' THEN 1 END) > 2

或者您可能更喜欢：

SELECT *
FROM (
    SELECT partnumber,
        SUM(CASE WHEN orderdate BETWEEN '2013-10-07' and '2013-10-13' THEN 1 END) week1,
        SUM(CASE WHEN orderdate BETWEEN '2013-10-14' and '2013-10-20' THEN 1 END) week2
    FROM orders
    GROUP BY partnumber
) t WHERE week1 > 2 AND week2 > 2

重复次数较少

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仅供参考，如果

orderdate

是一个日期，您就可以了。但是如果它有日期a和非零时间，您将丢失2013-10-13 00:00:00之后和2013-10-14 00:00:00之前的订单。

感谢您的快速回复！我唯一的问题是，如果满足其中一个条件，它会在第一周或第二周显示空白或<3。这些值可以从结果中消除吗？这取决于你所说的消除是什么意思。是否要将有问题的列中的值设为NULL，或者删除零件号的整个记录？从查询结果中删除零件号的记录。很简单…只需将

WHERE week1>2或week2>2

更改为

WHERE week1>2和week2>2

由于WHERE附近的语法错误，我无法运行第二个示例。我将第一个示例中HAVING子句中的OR改为AND，输出非常好，但现在缺少值。一些大于3的订单不起作用。