Question

对不起，我是使用T-SQL的新手，我想知道如何获得不会发生多次的价值。我已经尝试过了，但它没有用。

SELECT DISTINCT * 
FROM Orders 
WHERE PmtType  NOT IN ('VISA','DISC','FUNDING','DEALER CHECK','MC'
                       ,'AMEX','BONUS POOL','DLR CK - NET30'
                       ,'WIRE','MO','EXCHANGE','ONLINE','NULL')  
   AND OrderDate BETWEEN '2014-03-01 00:00:00' 
                          and '2015-03-01 00:00:00' 
   AND CompanyId  IN ('1311','8390','8394','8396','8397','8399','3966',
                     '8407','8408','8315','8411','8413','8414','8416'
                     ,'8419','4850','8426','8428','8429','8430')

我想要得到的就是这个。获得免费演示的公司。哪个PmtType是免费的，但从未购买过产品。

如果客户从不购买产品，则客户ID不应出现在

中

PmtType IN ('VISA','DISC','FUNDING','DEALER CHECK'
            ,'MC' ,'AMEX','BONUS POOL','DLR CK - NET30'
            ,'WIRE','MO','EXCHANGE','ONLINE','NULL')

Answer 1

如果我正确地阅读了这个问题，你想知道哪些ID只有1个订单，这就可以了。我使用了通用字段名称，因为您没有指定要查找的“值”...

编辑：在OP评论后添加NOT EXISTS子句，您可能不再需要该组，这取决于您...

SELECT CompanyId --add fields here as needed.
     ,Count(*) [Occurences]
FROM Orders o
WHERE PmtType = 'FREE'
AND NOT EXISTS (SELECT CompanyId 
                FROM Orders io 
                WHERE o.CompanyId = io.CompanyId 
                    AND PmtType <> 'FREE' )
GROUP BY CompanyId --add fields here as needed.
HAVING Count(*) = 1  --leave this out to see how many free demos each company got.

如何让T-SQL显示不会发生多次的值

1 个答案: