SQLITE将多行值转换为列

Question

我有事件状态表，该表的结构已经定义好，我想将多行值变成一行。

当前表数据：

事件：

EVENT       EVENTNAME       EVENTACTION     STATUS      TIMESTAMP
"Event1"    "FootBall"      "FootBall0"     "started"   "1554980085"
"Event1"    "TableTennis"   "TT0"           "started"   "1554980086"
"Event1"    "FootBall"      "FootBall0"     "success"   "1554980087"
"Event1"    "Chess"         "CHESS0"        "success"   "1554980095"
"Event1"    "TableTennis"   "TT0"           "running"   "1554980189"
"Event1"    "FootBall"      "FootBall1"     "started"   "1554980082"

我需要选择查询以显示数据，如下所示：

EVENT       EVENTNAME       EVENTACTION     STATUS      STARTTIME   RUNNINGTIME ENDTIME
"Event1"    "FootBall"      "FootBall0"     "success"   1554980085  NULL        1554980087
"Event1"    "TableTennis"   "TT0"           "running"   1554980086  1554980189  NULL 
"Event1"    "Chess"         "CHESS0"        "success"   1554980098  NULL        1554980100

我必须显示EVENT，EVENTNAME，EVENTACTION和最新的STATUS以及started，running和{{1 }}，如果时间不存在，则应设置success。

我使用了带大小写的SELECT查询，但是时间戳没有放在相关行中。

NULL

任何线索。

Answer 1

您需要按事件进行汇总，然后采用MAX表达式中的CASE：

SELECT
    AE.EVENT,
    AE.EVENTNAME,
    AE.EVENTACTION,
    MAX(CASE WHEN AE.STATUS = 'started' THEN AE.timestamp END) AS starttime,
    MAX(CASE WHEN AE.STATUS = 'running' THEN AE.timestamp END) AS runningtime,
    MAX(CASE WHEN AE.STATUS IN ('success', 'failed') THEN AE.timestamp END) AS endtime
FROM agentEvents AE
GROUP BY
    AE.EVENT,
    AE.EVENTNAME,
    AE.EVENTACTION
ORDER BY
    MAX(CASE WHEN AE.STATUS = 'started' THEN AE.timestamp END);

请注意，仅凭timestamp列进行排序是没有意义的，因为聚合后它不再存在。因此，我改为在开始时间之前订购。选择STATUS列也没有任何意义，因此我已将其删除。