工作流审批线路的开始节点时间存在哪张表，急！

工作流审批线路的开始节点时间存在哪张表

按之前论坛里面提供的方法连接了各表之后，无法查到开始节点的时间

SQL语句如下：
SELECT
t_SEC_User.FName,T_WF_ACTINST.FCREATETIME,T_WF_ACTINST_L.FACTNAME,
t_WF_ApprovalItem.FCompletedTime,
bt_Safety_CaseHanding.FBILLNO
FROM t_WF_PiBiMap
INNER JOIN t_WF_ProcInst ON (t_WF_ProcInst.FProcInstId = t_WF_PiBiMap.FProcInstId)
INNER JOIN t_WF_ActInst on (t_WF_ActInst.FProcInstId = t_WF_ProcInst.FProcInstId)
INNER JOIN T_WF_ACTINST_L ON(T_WF_ACTINST_L.factinstid=T_WF_ACTINST.factinstid)
INNER JOIN t_WF_Assign on (t_WF_Assign.FActInstId = t_WF_ActInst.FActInstId)
INNER JOIN T_WF_ASSIGN_L on (T_WF_ASSIGN_L.FASSIGNID =T_WF_ASSIGN.FASSIGNID)
INNER JOIN t_WF_Receiver on (t_WF_Receiver.FAssignId = t_WF_Assign.FAssignId)
INNER JOIN t_SEC_User ON (t_SEC_User.FUserId = t_WF_Receiver.FReceiverId)
INNER JOIN t_WF_ApprovalAssign on (t_WF_Assign.FAssignId = t_WF_ApprovalAssign.FAssignId)
LEFT JOIN t_WF_ApprovalItem on (t_WF_ApprovalItem.FApprovalAssignId = t_WF_ApprovalAssign.FApprovalAssignId
AND t_WF_ApprovalItem.FReceiverId = t_WF_Receiver.FReceiverId)
INNER JOIN T_WF_APPROVALITEM_L on (T_WF_APPROVALITEM_L.FAPPROVALITEMID = T_WF_APPROVALITEM.FAPPROVALITEMID)
LEFT JOIN bt_Safety_CaseHanding ON (bt_Safety_CaseHanding.fid=t_WF_PiBiMap.FKEYVALUE)
WHERE t_WF_PiBiMap.FOBJECTTYPEID='Bus_Safety_CaseHanding' AND T_WF_ASSIGN_L.FLOCALEID='2052' AND T_WF_ACTINST_L.FLOCALEID='2052'
AND bt_Safety_CaseHanding.FBILLNO LIKE '%C20170103%'