将bigint转换为日期

Question

我有两个日期计算如下：

CASE WHEN FinalApprovalDt is not null and mf.IncomingTocontrol = 1 THEN  DATEDIFF ( SECOND , ManualDecisionDt , lastChangesByAgentDt) END AS M_ttp
CASE WHEN FinalApprovalDt is not null and mf.IncomingTocontrol = 0 and ContractPayoutAmt > 0 THEN  DATEDIFF ( SECOND , SystemDecisionDt , lastChangesByAgentDt) END AS A_ttp

我需要将这两个的总量设置为秒，然后计算AVG，但是在以下情况下我得到NULL：

            (Case When FinalApprovalDt is not null and mf.IncomingTocontrol = 1 and ContractPayoutAmt > 0 then  DATEDIFF ( SECOND , ManualDecisionDt , lastChangesByAgentDt) End +
            Case When FinalApprovalDt is not null and mf.IncomingTocontrol = 0 and ContractPayoutAmt > 0 then  DATEDIFF ( SECOND , SystemDecisionDt , lastChangesByAgentDt) End ) As Total_TTP,

怎么了？

Answer 1

在该查询中有两个矛盾的情况，并且在不满足条件时您不处理案例。基于mf.IncomingTocontrol，第一个或第二个案例将为NULL，而NULL + Anything始终为NULL

您应该在每个CASE中放置ELSE块：

(
 Case When FinalApprovalDt is not null and mf.IncomingTocontrol = 1 and ContractPayoutAmt > 0 
 then  DATEDIFF ( SECOND , ManualDecisionDt , lastChangesByAgentDt) 
 ELSE 0 End 
 +
 Case When FinalApprovalDt is not null and mf.IncomingTocontrol = 0 and ContractPayoutAmt > 0 
 then  DATEDIFF ( SECOND , SystemDecisionDt , lastChangesByAgentDt) 
 ELSE 0 End 
) As Total_TTP,

如果为NULL，则使用COALESCE包装值

(
 COALESCE(Case When FinalApprovalDt is not null and mf.IncomingTocontrol = 1 and ContractPayoutAmt > 0 
 then  DATEDIFF ( SECOND , ManualDecisionDt , lastChangesByAgentDt) End, 0) 
 +
 COALESCE(Case When FinalApprovalDt is not null and mf.IncomingTocontrol = 0 and ContractPayoutAmt > 0 
 then  DATEDIFF ( SECOND , SystemDecisionDt , lastChangesByAgentDt) End, 0)
) As Total_TTP,