子查询返回多个结果

Question

我执行了3个表，如果执行，则将数据收集到一个临时表中

选择*从#TempTable我得到

DOG     AGE GENDER  T_id    I_name                      T_name
Fiddo   4   M       1       comfy bed                   bed
Daisy   7   F       1       red mat                     bed
Fluffy  1   M       1       old rug                     bed
Fiddo   4   M       2       bowl with paw               bowl
Daisy   7   F       2       chinese food tray           bowl
Fiddo   4   M       4       fancy leather collar        collar
Daisy   7   F       4       nametags on a string        collar
Fluffy  1   M       4       custom-stamped mardingale   collar
Daisy   7   F       3       blue ball                   toy
Fluffy  1   M       3       chewy bone                  toy

对于结果集，我正在寻找针对此表执行的查询

Select Distinct DOG,
                AGE,
                GENDER,
                BED = COALESCE((Select I_name from #TempTable where DOG = DOG and T_name = 'bed'), NULL),
                BOWL = COALESCE((Select I_name from #TempTable where DOG = DOG and T_name = 'bowl'), NULL),
                TOY = COALESCE((Select I_name from #TempTable where DOG = DOG and T_name = 'toy'), NULL),
                COLLAR = COALESCE((Select I_name from #TempTable where DOG = DOG and T_name = 'collar'), NULL)
From #TempTable

我遇到了错误

子查询返回的值超过1。 当子查询遵循=，！=，<，<=，>，> =或将子查询用作表达式时，不允许这样做。

因为据我所知DOG不能解析为一个值，关于语法的任何提示我都不能正确使用DOG的行值？ 我希望雏菊，菲多和蓬松的结果集中有3行，如果年龄，性别，床，碗为1或NULL，则为年龄，项圈和玩具为1或NULL。 感谢您的任何答复。

Answer 1

这是你想要的？

WITH Result
AS (
SELECT * FROM #TempTable
PIVOT 
(
MAX(I_name) FOR T_name IN ([Bed],[Bowl],[Collar],[Toy]) 
) AS PIvotTable
)
SELECT Dog, Age, Gender, Max(bed) AS [Bed], max(bowl) [Bowl], max(collar) [Collar], Max(Toy) [Toy]
FROM Result
GROUP BY DOG, AGE, GENDER

以上查询的结果：