选择中间表中与给定值/值相匹配的记录以及不在中间表中的记录？

Question

我有2个表

CREATE TABLE Floor (
Id bigint primary key identity(1,1), 
Name 
) 

表分配充当中介桌到桌楼

CREATE TABLE Assignment(
Id bigint primary key identity(1,1), 
AccountId bigint, 
. 
. 
FloorId bigint, --foreign key for Id column of floor table 
. 
. 
) 

如何选择：

1. 从地板表记录中的其中包含一个XML与Assignment表中的accountId匹配的accountId。

鉴于：

DECLARE @accountIdsXML XML = '<AccountId>73</AccountId><AccountId>74</AccountId>' 

记录不具有匹配在分配表

实施例：

表值：

Floor Table 
Id Name 
1  1st Floor 
2  2nd Floor 
3  3rd Floor 
4  4th Floor 
5  5th Floor 
6  6th Floor 
7  7th Floor 
8  8th Floor 
9  9th Floor 
10 10th Floor 

Assignment Table 
Id AccountId FloorId 
1  73   1 
1  73   2 
1  76   3 
1  79   4 
1  74   5 
1  74   6 
1  79   7 

选择输出：

Floor table 
Id Name 
1  1st Floor --matches accountid 73 
2  2nd Floor --matches accountid 73 
5  5th Floor --matches accountid 74 
6  6th Floor --matches accountid 74 
8  8th Floor --not in assignment table 
9  9th Floor --not in assignment table 
10 10th Floor --not in assignment table 

我基本上要选择分配给定ACCOUNTID和未分配的地板地板。

我已经成功地做到

DECLARE @accountIdsXML XML = '<AccountId>73</AccountId><AccountId>74</AccountId>' 
DECLARE @accountIdsTable as TABLE (Id BIGINT) --table variable to store accountids to be used in the where in operator. 

--insert accountids to the table variable 
INSERT INTO @accountIdsTable 
SELECT [aid].[Col].value('(.)[1]', 'BIGINT') FROM @accountIdsXML.nodes('/AccountId') as [aid]([Col]) 

SELECT F.* FROM [Assignment] A RIGHT JOIN [Floor] F ON A.FloorId = F.Id 
WHERE (A.AccountId IN(SELECT Id from @accountIdsTable) OR F.Id NOT IN (SELECT FloorId FROM Assignment)) 

Answer 1

不要从分配选择，而是只从楼层选择，然后在第一个WHERE子句你加入他们两个：

SELECT F.* FROM [Floor] F 
WHERE EXISTS 
(
    SELECT 1 FROM [Assignment] A 
    INNER JOIN @accountIdsTable AI ON AI.Id = A.AccountId  
    WHERE A.FloorId = F.Id 
) 
OR F.Id NOT IN (SELECT FloorId FROM Assignment) 

这里的a link the Fiddle