SQL结果为一行

Question

我有以下声明：

SELECT        
    Person.PersonID, Person.PersonName, Person.Surname, 
    Address.Street, Address.PostCode,
    (SELECT Phones.Num
     WHERE (Phones.CommunicationTypeId = '78')) AS email, 
    (SELECT Phones.Num
     WHERE (Phones.CommunicationTypeId = '83')) AS mobile,
    (SELECT Phones.Num
     WHERE (Phones.CommunicationTypeId = '88')) AS phone
FROM     
    Address 
RIGHT OUTER JOIN
    Person ON Address.ObjectId = Person.PersonID 
RIGHT OUTER JOIN
    Phones ON Person.PersonID = Phones.ObjectID

现在结果显示了单独的行，而我想将它放在一行中：

如何将其合并为一行？

Answer 1

看起来你的人有多个相应的电话记录（我想有两种不同类型的记录。

SELECT 
    ObjectID,
    MAX(CASE WHEN CommunicationTypeId = '78' THEN Num ELSE null END) as email,
    MAX(CASE WHEN CommunicationTypeId = '83' THEN Num ELSE null END) as mobile,
    MAX(CASE WHEN CommunicationTypeId = '88' THEN Num ELSE null END) as phone
FROM Phones
GROUP BY ObjectID

上面的选择为每个人返回3列，您可以在主查询中使用它

SELECT     
    Person.PersonID, Person.PersonName, Person.Surname, 
    Address.Street, Address.PostCode,
    Phones.email, Phones mobile, Phones.phone
FROM
    Address 
RIGHT OUTER JOIN
    Person ON Address.ObjectId = Person.PersonID 
RIGHT OUTER JOIN
    (sub query above) Phones ON Person.PersonID = Phones.ObjectID