Sql Server迭代

Question

我正在使用while循环来检索5个值。

在循环结束时，我想将所有值加起来以产生总和。

例如

• ITERATION_1 = 5
• ITERATION_2 = 8
• ITERATION_3 = 2
• ITERATION_4 = 3
• ITERATION_5 = 2

所以总将是20

这是我到目前为止：

WHILE(@PROJECT_SEQ>0) 
BEGIN 

    SELECT @PROJ_ID=PROJECT_ID FROM #TmpProjects WHERE SEQ_NO=@PROJECT_SEQ 


    SELECT COUNT(idDP_Entity_Activity)AS COUNT1 FROM DP_Project_Details PD 
    INNER JOIN DP_Initiation I 
     ON I.FK_Project_ID=PD.Project_ID 
    INNER JOIN DP_Entities E 
     ON E.FK_Project_ID=PD.Project_ID 
    INNER JOIN DP_Entity_Activity EA 
     ON EA.FK_idDP_Entities=E.idDP_Entities 
    WHERE PD.Project_ID=@PROJ_ID 




    --SET @COUNT=@COUNT+@COUNT 
    --SELECT @COUNT,@PROJ_ID 

    SET @PROJECT_SEQ=@PROJECT_SEQ-1 

END 

Answer 1

当然，更简单的方法是将这些项目计算在内？

SELECT COUNT(idDP_Entity_Activity)AS [TOTAL_PROJECT_COUNT] 
    FROM DP_Project_Details PD 
    INNER JOIN DP_Initiation I 
     ON I.FK_Project_ID=PD.Project_ID 
    INNER JOIN DP_Entities E 
     ON E.FK_Project_ID=PD.Project_ID 
    INNER JOIN DP_Entity_Activity EA 
     ON EA.FK_idDP_Entities=E.idDP_Entities 
    WHERE PD.Project_ID in (Select Project_ID From #TmpProjects 
          Where Seq_No <= @PROJECT_SEQ)