选择表中的人并排除妻子但合并他们的名字
我有一张桌子Person
:
PersonID | FirstName | LastName
-------------------------------
1 | John | Doe
2 | Jane | Doe
3 | NoSpouse | Morales
4 | Jonathan | Brand
5 | Shiela | Wife
还有一个 Relationship
表:
RelationshipID | PersonID | Type | RelatedPersonID
1 | 1 | 3 | 2
2 | 2 | 3 | 1
3 | 4 | 3 | 5
4 | 5 | 3 | 4
所以基本上,我想结合配偶和客户的名字,但我想排除配偶:
So basically, I want to combine the names of the spouse and client, but I want to exclude the spouse:
预期结果:
1, John and Jane Doe, 2
----------------------
3, NoSpouse Morales, null
-----------------------
4, Jonathan and Shiela Brand, 5
我试过了:
SELECT p.PersonID,
Case when spouse.PersonID is not null
THEN p.FirstName + ' and ' + spouse.FirstName + ' ' + p.LastName
ELSE p.FirstName + ' ' + p.LastName END as ClientName,
spouse.PersonID as RelatedPersonID
FROM Person p
LEFT JOIN Relationship r on p.PersonID = r.PersonID
LEFT JOIN Person spouse on r.RelatedPersonID = spouse.PersonID
WHERE r.Type = 3 OR spouse.PersonID is null
但结果是:
1, John and Jane Doe, 2
----------------------
2, Jane and John Doe, 1
----------------------
3, NoSpouse Morales, null
-----------------------
4, Jonathan and Shiela Brand, 5
-------------------------------
5, Shiela and Jonathan Wife, 4
这是一些模拟数据:
create table Person(
PersonID int primary key,
FirstName varchar(max),
LastName varchar(max)
)
insert into Person values
(1, 'John', 'Doe'),
(2, 'Jane', 'Doe'),
(3, 'NoSpouse', 'Morales'),
(4, 'Jonathan', 'Brand'),
(5,'Shiela','Wife')
create table Relationship (
RelationshipID int,
PersonID int references Person(PersonID),
Type int,
RelatedPersonID int references Person(PersonID)
)
insert into Relationship values
(1, 1, 3, 2),
(2, 2, 3, 1),
(3, 4, 3, 5),
(4, 5, 3, 4)
SELECT p.PersonID,
Case when spouse.PersonID is not null
THEN p.FirstName + ' and ' + spouse.FirstName + ' ' + p.LastName
ELSE p.FirstName + ' ' + p.LastName END as ClientName,
spouse.PersonID as RelatedPersonID
FROM Person p
LEFT JOIN Relationship r on p.PersonID = r.PersonID
LEFT JOIN Person spouse on r.RelatedPersonID = spouse.PersonID
WHERE r.Type = 3 OR spouse.PersonID is null
drop table Relationship
drop table Person
提前感谢您的帮助和时间.
thanks in advance for your help and time.
注意:我已经编辑了我的模拟脚本以在结果中包含 3, NoSpouse Morales, null
.此外,对于丈夫/妻子,也不需要特别的标准.列表中最先被提取的人不应包括相关配偶.
NOTE:
I've edited my mock script to include 3, NoSpouse Morales, null
in the results. Also, there is no particular criteria needed to which is husband/wife. Whoever was fetched first in the list should not include the related spouse.
推荐答案
如果必须包含一个而另一个排除,请尝试添加子句
If one has to be included while the other excluded, try adding a clause
AND r.PersonID < r.RelatedPersonID
因为 ID 不相等,这将只包括其中一个:
since the IDs will not be equal and this will include only either one:
SELECT p.PersonID,
Case when spouse.PersonID is not null
THEN p.FirstName + ' and ' + spouse.FirstName + ' ' + p.LastName
ELSE p.FirstName + ' ' + p.LastName END as ClientName,
spouse.PersonID as RelatedPersonID
FROM Person p
LEFT JOIN Relationship r on p.PersonID = r.PersonID
LEFT JOIN Person spouse on r.RelatedPersonID = spouse.PersonID
WHERE (r.Type = 3 AND r.PersonID < r.RelatedPersonID) OR spouse.PersonID is null
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