停止每月订购的客户-SQL

Question

我正在尝试编写一个SQL查询，显示在一个月内停止订购的STORES。那将是前一个月有订单但当月没有订单的商店。例如，一月份有订单但二月份没有订单的店（这些将停止订购二月份的店）。我想对于一个给定的日期范围内做到这一点的每个月（分组） - @ datefrom- @ dateto

我与发票＃，＃STORE和日期列一个表

我想不同的商店将在那里的某个地方。

Answer 1

你可以尝试这样的事情，把它们分解成两个select语句，然后把它们连接起来。

select table1.stores from (select * from table where date = 'January') as table1 
left outer join (select * from table where date = 'Feburary') as table2 
on table1.invoice= table2.invoice 

这将返回一月份的独特的结果，不结果从二月

PS相匹配。这不是一个确切的SQL语句，只是一个想法

Answer 2

我有一个例子可能接近你的愿望。您可能需要调整其对您的方便和期望的性能 - http://sqlfiddle.com/#!3/231c4/15

create table test (
    invoice int identity, 
    store int, 
    dt date 
); 

-- let's add some data to show that 
-- store 1 ordered in Jan, Feb and Mar 
-- store 2 ordered in Jan (missed Feb and Mar) 
-- store 3 ordered in Jan and Mar (missed Feb) 
insert into test (store, dt) values 
(1, '2015-01-01'),(1, '2015-02-01'),(1, '2015-03-01'), 
(2, '2015-01-01'), 
(3, '2015-01-01'),     (3, '2015-03-01'); 

Query 
----- 
with 
months as (select distinct year(dt) as yr, month(dt) as mth from test), 
stores as (select distinct store from test), 
months_stores as (select * from months cross join stores) 

select * 
from months_stores ms 
left join test t 
    on t.store = ms.store 
    and year(t.dt) = ms.yr 
    and month(t.dt) = ms.mth 
where 
    (ms.yr = 2015 and ms.mth between 1 and 3) 
    and t.invoice is null 

Result: 
yr  mth  store ...other columns 
2015 2  2 
2015 2  3 
2015 3  2 

The results show us that store 2 missed orders in months Feb and Mar 
and store 3 missed an order in Feb