的SQL Server ...子查詢返回多個

-1

id  record_name  record_value 
------------------------------------- 
1001 price1   12 
1001 price2   1 
1001 price3   8 
1201 price1   18 
1201 price2   2 
1201 price3   6 
1601 price1   12 
1601 price2   8 
1601 price3   8

輸出的SQL Server ...子查詢返回多個

id  price1  value  price2  value  price3  value 
-------------------------------------------------------------------------- 
1001 price1  12   price2  1   price3  8 
1201 price1  18   price2  2   price3  6

我收到錯誤

子查詢返回多個值。當子查詢遵循=，！=，<，< =，>，> =或當子查詢用作表達式時，這是不允許的。

我用這個查詢：

select distinct 
    a.id, 'Price1', 
    (select record_value 
    from table_name 
    where id = a.id and record_name = 'price1') as 'value1', 
    'Price2', 
    (select record_value 
    from table_name 
    where id = a.id and record_name = 'price2') as 'value2', 
    'Price3', 
    (select record_value 
    from table_name 
    where id = a.id and record_name = 'price3') as 'value3' 
from 
    table_name a

請儘量解決這個問題！

來源

2014-11-25 Kumar

那麼，哪個DBMS？ Postgres的？ SQL Server？ SQLite的？ – 2014-11-25 07:30:01

好問題。哪一個 – Jaques 2014-11-25 07:31:30

隨着你在這裏發佈的數據..有沒有像這樣的錯誤..它的工作很好.. – Deepshikha 2014-11-25 07:36:56

這種方法有點不同。但是，你可以這樣做：

SELECT 
    table_name.id, 
    'price1' AS price1, 
    SUM(CASE WHEN record_name='price1' THEN record_value ELSE 0 END) AS value1, 
    'price2' AS price2, 
    SUM(CASE WHEN record_name='price2' THEN record_value ELSE 0 END) AS value2, 
    'price3' AS price2, 
    SUM(CASE WHEN record_name='price3' THEN record_value ELSE 0 END) AS value3 
FROM 
    table_name 
GROUP BY 
    table_name.id

更新

要回復記者的置評。是的，它會工作。如果我們看一下這樣一個簡單的測試：

DECLARE @tbl TABLE(ID INT, test VARCHAR(100)) 

INSERT INTO @tbl 
VALUES 
(1,'foo'), 
(1,'foo'), 
(1,'bar'), 
(1,'bar')

此查詢將有一個靜態值作爲price1。

SELECT 
    tbl.ID, 
    'price1' as price1 
FROM 
    @tbl AS tbl 
GROUP BY 
    tbl.ID

更新2

然後，如果你不想SUM值。然後，您可以改用MAX。像這樣：

SELECT 
    table_name.id, 
    'price1' AS price1, 
    MAX(CASE WHEN record_name='price1' THEN record_value ELSE 0 END) AS value1, 
    'price2' AS price2, 
    MAX(CASE WHEN record_name='price2' THEN record_value ELSE 0 END) AS value2, 
    'price3' AS price2, 
    MAX(CASE WHEN record_name='price3' THEN record_value ELSE 0 END) AS value3 
FROM 
    table_name 
GROUP BY 
    table_name.id

來源

2014-11-25 07:33:01 Arion

由於price1，price2，..etc包含在Group by中，此查詢是否有效？ – 2014-11-25 07:37:20

@PareshJ：更新了答案 – Arion 2014-11-25 07:42:28

Arion，很好的例子。我一直懷疑靜態列值是否需要分組。現在，它很清楚。 – 2014-11-25 07:46:08

我剛剛修改了查詢，在查詢中加入了'top 1'以避免'Subquery返回多個值'的錯誤。檢查並更新您的狀態。

select distinct 
    a.id, 'Price1', 
    (select top 1 record_value 
    from table_name 
    where id = a.id and record_name = 'price1') as 'value1', 
    'Price2', 
    (select top 1 record_value 
    from table_name 
    where id = a.id and record_name = 'price2') as 'value2', 
    'Price3', 
    (select top 1 record_value 
    from table_name 
    where id = a.id and record_name = 'price3') as 'value3' 
from 
    table_name a

來源

2014-11-25 09:32:21 Veera

我需要所有記錄，包括重複.....頂1不會爲我工作:( – Kumar 2014-11-25 13:23:55

你也可以嘗試在子查詢Distinct。它不是最好的解決方案，但它的工作。

select distinct 
a.id, 'Price1', 
(select distinct record_value 
from table_name 
where id = a.id and record_name = 'price1') as 'value1', 
'Price2', 
(select distinct record_value 
from table_name 
where id = a.id and record_name = 'price2') as 'value2', 
'Price3', 
(select distinct record_value 
from table_name 
where id = a.id and record_name = 'price3') as 'value3' 
from 
table_name a

來源

2014-11-25 09:51:04

的SQL Server ...子查詢返回多個

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