将 sql 行转换为列

Question

我有一个非常不寻常的请求。我在 table 中有一些过滤数据，列是 ID、日期和事件。事件是一个 XML 列，其中一个标记是 StartWork 和 EndWork。我从海量数据中过滤掉了一个请求的数据。我的示例数据有 6 行，依次为 StartWork、EndWork、StartWork、EndWork 等。我到底想做的是找到每个组合之间的时间差。我的意思是，EndWork - StartWork = 差异。下一个 EndWork - StartWork = Difference2 等等。

基本上我想要，2-1、4-3、6-5等等。我尝试用 Pivot 做，但无法得到想要的结果

Answer 1

这应该对您有帮助：

declare @xmlStart XML='<data><status>StartWork</status></data>';
declare @xmlENd XML='<data><status>EndWork</status></data>';

declare @tbl TABLE(id INT,datecreated DATETIME,eventdata XML);
INSERT INTO @tbl VALUES(1,{ts'2015-07-29 09:17:34'},@xmlStart)
                      ,(2,{ts'2015-07-29 09:20:24'},@xmlEnd)
                      ,(3,{ts'2015-07-29 10:05:41'},@xmlStart)
                      ,(4,{ts'2015-07-29 10:18:34'},@xmlEnd);

WITH resolvedCTE AS
(
    SELECT TOP 100 PERCENT id,datecreated,eventdata.value('(/data/status)[1]','varchar(max)') AS EventStatus FROM @tbl
)
,StartEvnets AS
(
    SELECT ROW_NUMBER() OVER(ORDER BY datecreated) AS inx,id,datecreated FROM resolvedCTE WHERE EventStatus='StartWork' 
)
,EndEvnets AS
(
    SELECT ROW_NUMBER() OVER(ORDER BY datecreated) AS inx,id,datecreated FROM resolvedCTE WHERE EventStatus='EndWork' 
)SELECT StartEvnets.id, CAST(EndEvnets.datecreated - StartEvnets .datecreated AS TIME)
FROM StartEvnets
INNER JOIN EndEvnets ON StartEvnets.inx =EndEvnets.inx

Answer 2

Select DateDiff(minute,StartWork.datacreated,EndWork.datacreated)
from 
(Select datacreated,LineNb=row_number() over(Order by datacreated) from Table where eventdata.value('(/data/status/text())[1]','varchar(15)')='StartWork') StartWork
INNER JOIN 
(Select datacreated,LineNb=row_number() over(Order by datacreated) from Table where eventdata.value('(/data/status/text())[1]','varchar(15)')='EndWork') EndWork
ON StartWork.LineNb=EndWork.LineNb

Answer 3

假设 "tbl" 是您的 table 姓名。给你：

SELECT t.datecreated - t2.datecreated
FROM tbl t, tbl t2
WHERE t.id IN
    (SELECT id FROM tbl WHERE _eventdata LIKE ('%EndWork%'))
    AND t2.id = t.id -1

如果有效请标记为已回答...

将 sql 行转换为列

transform sql rows to column

sql

sql-server

pivot