帶有日期過濾器的SQL Server查詢

Question

我有一個這樣的表;

ID int, 
OrderedDate DateTime 

我想只選擇下個月的記錄。

例如結果集：

ID OrderedDate 

110 January 
110 February 
200 January 
200 February 

如何我寫這篇文章的查詢？

Answer 1

我想你想要的ID有訂單的月份列表，但月份按月份編號而不是名稱排序的月份列表？

create table test21210 
(
    id int, 
    OrderedDate datetime 
) 
go 

insert test21210 (id, OrderedDate) values (110, '1/1/2010') 
insert test21210 (id, OrderedDate) values (110, '1/5/2010') 
insert test21210 (id, OrderedDate) values (110, '1/10/2010') 
insert test21210 (id, OrderedDate) values (110, '2/2/2010') 
insert test21210 (id, OrderedDate) values (110, '2/4/2010') 
insert test21210 (id, OrderedDate) values (110, '2/6/2010') 

insert test21210 (id, OrderedDate) values (200, '1/3/2010') 
insert test21210 (id, OrderedDate) values (200, '1/5/2010') 
insert test21210 (id, OrderedDate) values (200, '1/7/2010') 
insert test21210 (id, OrderedDate) values (200, '1/9/2010') 
insert test21210 (id, OrderedDate) values (200, '2/3/2010') 
insert test21210 (id, OrderedDate) values (200, '2/5/2010') 
insert test21210 (id, OrderedDate) values (200, '2/7/2010') 
insert test21210 (id, OrderedDate) values (200, '2/9/2010') 
go 

with idmonth (id, MonthNumber) as 
(
    select id, MONTH(ordereddate) as 'MonthNumber' 
    from test21210 
    group by id, MONTH(ordereddate) 
) 
select id, DATENAME(MONTH, STR(MonthNumber)+'/1/2000') 
from idmonth 
order by id, MonthNumber 

Answer 2

這個問題似乎有點不清楚。但是這個例子使得它看起來像你想按ID排序，然後按月份名稱排序。如果是這樣，那麼我認爲這將做到這一點。我沒有SQL Server來測試它，所以我確定它有語法或其他錯誤。

SELECT ID, DATENAME(month, OrderedDate) AS OrderedDate from table 
     ORDER BY 1, MONTH(OrderedDate)