執行一個查詢，不包括指定的聚合函數的錯誤消息

Question

我有以下查詢，返回的錯誤信息"you tried to execute a query that does not include the specified expression"

SELECT o.ea_guid as CLASSGUID, o.object_type as CLASSTYPE, o.name, COUNT(o.name) as NameCount 
FROM t_object as o 
GROUP BY o.name 
HAVING (COUNT(o.name)>1) 

現在，如果我加入了GROUP BY子句中o.ea_guid & o.object_type，沒有結果返回

我在做什麼錯？

Answer 1

COUNT（o.name）是一個聚合;其他屬性不是。如果你想顯示一個非聚集，你必須把它放在GROUP BY子句中。這將爲您提供三個字段CLASSGUID，CLASSTYPE和NAME的每個唯一組合的行數。

SELECT 
    o.ea_guid as CLASSGUID, 
    o.object_type as CLASSTYPE, 
    o.name as NAME, 
    COUNT(*) as NameCount 
FROM 
    t_object as o 
GROUP BY 
    o.ea_guid, 
    o.object_type, 
    o.name 

HAVING 
    (COUNT(*)>1) 

這可能不是你的想法...

Answer 2

查詢有兩個錯誤：

o.ea_guid as CLASSGUID, o.object_type as CLASSTYPE 

意味着結果將被引用到Enterprise Architect的模型特別是假象，因此您不能在Enterprise Architect中的聚合查詢中使用它。用途：

SELECT o.name, COUNT(o.name) as NameCount 
FROM t_object as o 
GROUP BY o.name 
HAVING (COUNT(o.name)>1) 

或全部選定的屬性必須是在GROUP BY子句：

SELECT o.ea_guid as CLASSGUID, o.object_type as CLASSTYPE, o.name, COUNT(o.name) as NameCount 
FROM t_object as o 
GROUP BY o.ea_guid , o.object_type , o.name 
HAVING (COUNT(o.name)>1) 

這似乎在這種情況下