Question

好的，我需要一个T-SQL大师。

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

我该怎么做？

我坚持这个。

感谢您的帮助

Answer 1

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。

Answer 2

这不是很漂亮，但应该有用。您将连接保留在同一个表中，包括连接条件中的事件代码，断言右表没有IS NULL的行，然后执行DISTINCT以避免返回的许多行。

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 3

假设我正确理解了这个问题，我会使用类似的东西：

-- 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 4

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 5

也许这个？：

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

SQL Query选择count = 0

5 个答案: