從 sql 查詢中透視和合並數據

Question

這是我的查詢：

SELECT  ad.Name, av.Value AS Attribute1, ctv.Value AS Attribute2
FROM    AttributeDefinitions AS ad WITH (nolock) 
INNER JOIN AttributeValues AS av WITH (nolock) 
ON      ad.AttributeDefinitionID = av.AttributeDefinitionID 
INNER JOIN AttributeCategories 
ON      ad.AttributeCategoryID = AttributeCategories.AttributeCategoryID 
LEFT OUTER JOIN CodeTableValues AS ctv WITH (nolock) 
ON      av.CodeTableValueID = ctv.CodeTableValueID
WHERE   (AttributeCategories.Name = 'Camp') AND (av.AttributeValueGroupID = 9840)

我的結果如下所示：

Name                     Attribute1      Attribute2
Childs Age:              10 
Attended Camp Before?:   Yes
Childs T-Shirt Size:     large           NULL
Allergies Description    none            NULL
Phone #                  212-555-1212    NULL
Pickup                   Mary Jordan     NULL

Name= Name of Attribute Column
Attribute1 = Data is from a free Form
Attribute2 = Data is from a Drop down Menu   

我想做的是旋轉數據，以便“名稱”列中的信息成為 header 列，我需要組合屬性 1 和 2 中的值這是我的結果應該看起來像：

*Childs Age  Attended Camp Before?  Childs T-Shirt Size  Allergies Description Phone#        Pickup*
10           yes                    large                none                  212-555-1212  Mary Jordan

Answer 1

在 Oracle DB 中，我使用 CASE 語句將行轉換為列。

看看這個例子：

select event_date
      ,sum(case when service_type = 'OCSAC_DEG'  then service_count end) ocsac_deg
      ,sum(case when service_type = 'SMS_ONL'    then service_count end) sms_onl        
      ,sum(case when service_type = 'SMS_DEG'    then service_count end) sms_deg
      ,sum(case when service_type = 'DATA_ONL'   then service_count end) data_onl        
      ,sum(case when service_type = 'DATA_DEG'   then service_count end) data_deg             
 from STATS
where to_char(event_date, 'yyyymm') = to_char(add_months(sysdate,-1), 'yyyymm')   
group by event_date
order by event_date desc