计算访问并按公司分组

Question

我创建了这个T-Sql查询，为我提供了多少访问客户并按公司分组 我的Pronlem是我的查询不只计算一次访问而不是按公司分组

SELECT     COUNT(  VisitTracking.customerID) AS #VISIT
                , MAX(VisitTracking.visitID) AS visitID
                ,Customers.title AS Title
                ,Customers.customerID
                ,Customers.firstName AS "First Name" 
                ,Customers.LastName AS "Last Name"
                ,Company.companyName AS "Company Name"
                ,VisitTracking.DateVisited AS "Date Visited"
                ,VisitTracking.nextVisit AS "Next Visit"
FROM         VisitTracking INNER JOIN
                      Customers ON VisitTracking.customerID = Customers.customerID INNER JOIN
                      Company ON VisitTracking.companyID = Company.companyID
GROUP BY VisitTracking.companyID,Customers.customerID, VisitTracking.customerID, Customers.title, Customers.firstName, Customers.LastName, Company.companyName, VisitTracking.DateVisited,VisitTracking.nextVisit 

输出

我想要什么

2   29  Mr  2   Mike    Mike        N/A 2013-01-31  
1   28  Mr  2   Mike    Mike        Compudata   2013-01-31

Answer 1

问题是因为您使用的是DataVisited字段，您应该删除字段或执行类似的操作。

SELECT     COUNT(  VisitTracking.customerID) AS #VISIT
                , MAX(VisitTracking.visitID) AS visitID
                ,Customers.title AS Title
                ,Customers.customerID
                ,Customers.firstName AS "First Name" 
                ,Customers.LastName AS "Last Name"
                ,Company.companyName AS "Company Name"
                ,MAX(VisitTracking.DateVisited) AS "Date Visited"
                ,VisitTracking.nextVisit AS "Next Visit"
FROM         VisitTracking INNER JOIN
                      Customers ON VisitTracking.customerID = Customers.customerID INNER JOIN
                      Company ON VisitTracking.companyID = Company.companyID
GROUP BY VisitTracking.companyID,Customers.customerID, VisitTracking.customerID, Customers.title, Customers.firstName, Customers.LastName, Company.companyName,VisitTracking.nextVisit