SQL查询选择计数= 0

Question

好的，我需要一个T-SQL这个专家。

我有一个名为PackageStoreEvents的表，它有一个packageid，storecode和一个eventcode字段。我想返回storecode 2406的packageid值，其中eventcode = 6的计数为0.

我该怎么做？

我被困在这一个。

感谢您的帮助

Answer 1

这不是非常漂亮，但应该工作。您在连接条件中将连接留在同一个表中，包括事件代码，声明右表没有包含IS NULL的行，然后执行DISTINCT以避免将以其他方式返回的许多行。

SELECT DISTINCT p1.packageid 
FROM PackageStoreEvents p1 
     LEFT JOIN 
       PackageStoreEvents p2 
       ON p1.packageid = p2.packageid 
       AND p1.storecode = p2.storecode 
       AND p2.eventcode = 6 
WHERE p2.packageid IS NULL 
AND p1.storecode = 2406 

Answer 2

也许这?:

SELECT PackageID 
FROM PackageStoreEvents 
WHERE Storecode = 2406 and EventCode = 6 
GROUP BY PackageID 
HAVING COUNT(EventCode) = 0 

Answer 3

SELECT packageid 
FROM 
PackageStoreEvents p1 
WHERE storecode = 2406 
AND NOT EXISTS (SELECT * FROM PackageStoreEvents p2 
       WHERE p1.packageid = p2.packageid 
       AND p1.storecode = p2.storecode 
       AND p2.eventcode = 6) 

Answer 4

假设我正确地理解这个问题，我会用的东西沿着这行：

-- PackageStoreEvents (packageid, storecode, eventcode) 

SELECT DISTINCT packageid 
    FROM PackageStoreEvents r 
WHERE storecode = 2406 
    AND NOT EXISTS (SELECT * 
         FROM PackageStoreEvents cnt 
        WHERE cnt.packageid = r.packageid 
         AND cnt.storecode = r.storecode 
         AND cnt.eventcode = 6) 

Answer 5

尝试：

select packageid 
from PackageStoreEvents 
where storecode = 2406 
group by packageid 
having sum(case eventcode when 6 then 1 else 0 end)=0; 

用于单遍查询。