SQL LEN() 函数 ,case when,聚合函数的用法

SELECT aa.[User_Id],cc.[User_Name],dd.Name AS DepName,aa.Module_Id,aa.Module_Name,SUM(CASE aa.Operate_Type WHEN ‘2’ THEN OperateNum END ) AS ‘AddNum’,SUM(CASE aa.Operate_Type WHEN ‘3’ THEN OperateNum END ) AS ‘EditNum’ ,SUM(CASE aa.Operate_Type WHEN ‘4’ THEN OperateNum END ) AS ‘DelNum’FROM (SELECT a.[User_Id],a.Module_Id,c.Module_Name,a.Operate_Type,COUNT(1) AS OperateNum FROM dbo.Sys_User_Log AS aINNER JOIN dbo.Sys_Module AS c ON a.Module_Id = c.Module_IdWHERE LEN(a.Module_Id) = 6 AND (a.Operate_Type =’2′ OR a.Operate_Type =’3′ OR a.Operate_Type =’4’)//LEN() 函数GROUP BY a.[User_Id],a.Module_Id,c.Module_Name,a.Operate_Type) AS aaINNER JOIN dbo.Sys_User AS cc ON aa.[User_Id] = cc.[User_Id]INNER JOIN dbo.Sys_DepInfo AS dd ON cc.DepInfo_Id = dd.IdGROUP BY aa.[User_Id],cc.[User_Name],dd.Name,aa.Module_Id,aa.Module_NameORDER BY aa.[User_Id],aa.Module_Id

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