在SQL Server 2012中，我有四个表格如下：
Issues：
IssueID | IssueTitle
1 | Light Bulb Burnt Out
2 | Thermostat not working
LocationTypes：
TypeID | Type
1 | Building
2 | Floor
3 | Room
Locations：
LocaltionID | TypeID | Location | ParentLocation
0 | 1 | default | 0
1 | 1 | Sears Tower | 0
2 | 1 | IDS | 0
3 | 2 | Floor 1 | 1
4 | 2 | Floor 2 | 1
5 | 2 | Floor 3 | 1
6 | 2 | Floor 4 | 1
7 | 2 | Floor 5 | 1
8 | 2 | Floor 6 | 1
9 | 2 | Floor 7 | 1
10 | 2 | Floor 8 | 1
108 | 3 | Room 101 | 3
109 | 3 | Room 102 | 3
110 | 3 | Room 110 | 3
111 | 3 | Room 202 | 4
112 | 3 | Room 300 | 5
175 | 2 | 1st Floor | 2
185 | 2 | 2nd Floor | 2
186 | 3 | Suite 295 | 185
IssueLocations：
IssueID | LocationId
1 | 1
1 | 5
1 | 112
2 | 2
2 | 185
我想要做的是组合表格，以便每个发行者最终得到一行，字段名称为列标题和字段值，所以我最终得到：
结果：
IssueID | IssueTitle | Building | Floor | Room
--------------------------------------------------------------------------
1 | Light Bulb Burnt Out | Sears Tower | Floor 1 | Room 300
2 | Thermostat not working | IDS | 2nd Floor |
注意第二个问题没有房间（不需要位置），位置较少的问题是有效的。请注意，其他约束可能会导致所需的位置，但我认为这与此问题无关。
答案 0 :(得分：2)
您需要使用Pivot 将您的行转置到列。
SELECT *
FROM (SELECT il.IssueID,
l.Location,
i.IssueTitle,
lt.Type
FROM Locations l
JOIN LocationTypes lt
ON l.TypeID = lt.TypeID
JOIN IssueLocations il
ON il.LocationId = l.LocaltionID
JOIN issues i
ON i.IssueID = il.IssueID) a
PIVOT (Max(location)
FOR type IN([Building],
[Floor],
[Room]))piv