Question

我需要帮助格式化sql查询中的数据以创建图表。这是下面的查询。

SELECT install_status, Date_appended , COUNT(serial_number)
FROM Asset_Base
Where  (Date_appended = '2017-09-26' OR Date_appended = '2017-08-31' OR Date_appended = '2017-07-31')
AND (install_status= 'Installed' 
OR (install_status= 'In Stock' AND u_install_sub_status = 'Available')
OR install_status= 'Missing') 
Group By install_status , Date_appended

返回：

install_status  Date_appended           (No column name)
In Stock        2017-08-31 00:00:00.000 10981
Installed       2017-08-31 00:00:00.000 58764
Missing         2017-08-31 00:00:00.000 51661
In Stock        2017-09-26 00:00:00.000 10830
Installed       2017-09-26 00:00:00.000 59083
Missing         2017-09-26 00:00:00.000 51209

我有什么方法可以让数据看起来像这样吗？

Date_appended In Stock Installed Missing
2017-08-31    10981    58764     51661
2017-09-26    10830    59083     51209

谢谢！

Answer 1

如果你只是希望每Date_appended行只有一行：

  ...
GROUP BY appended;

如果您想要的列只计算serial_numbers，install_status为In Stock，请使用以下内容：

SELECT
 COUNT(CASE WHEN install_status = 'In Stock' THEN 1 END),
 ...

case个表达式将每个非In Stock行映射到null（由于else null的隐含case子句。 count通常会忽略null个值（与大多数聚合函数一样）。

可以同样添加其他列。

在此处阅读有关此透视技术的更多信息：http://modern-sql.com/use-case/pivot

Answer 2

我认为您可以使用枢轴。希望以下查询对您有所帮助：

       SELECT * FROM (
        select 'In Stock' as install_status, '2017-08-31' as Date_appended  , 10981 as 'serial_number'
        UNION ALL
        select 'Installed' as install_status, '2017-08-31' as Date_appended  , 58764 as 'serial_number'
        UNION ALL
        select 'Missing' as install_status, '2017-08-31' as Date_appended  , 51661 as 'serial_number'
        ) AS A
        PIVOT
        (
            MAX(serial_number)
            For install_status in ([In Stock] ,[Installed],[Missing])
        ) PT

RESULT : 
    Date_appended In Stock    Installed   Missing
    ------------- ----------- ----------- -----------
    2017-08-31    10981       58764       51661

    (1 row(s) affected)

Answer 3

您可以使用此查询。

SELECT * FROM 
    ( SELECT install_status, serial_number , Date_appended FROM @Asset_Base
      WHERE Date_appended IN ('2017-09-26', '2017-08-31', '2017-07-31')
            AND (install_status IN ( 'Installed' , 'Missing')
                OR (install_status= 'In Stock' AND u_install_sub_status = 'Available')) ) SRC 
        PIVOT ( COUNT(serial_number) FOR install_status IN ([In Stock], [Installed], [Missing])) PVT

重新格式化图表的SQL数据

3 个答案: