向此 ef 核心查询添加连续计数

Question

I have the below query in Entity Framework Core that reports on amounts of sales, grouped by customer, between given dates.

IEnumerable<SalesDataModel> currentSales =
(from s in sales
where s.Date >= [StartDate] && u.Date <= [EndDate]
join c in customers on s.Acct equals c.Account
group s by new { s.Name, c.City } into g
select new SalesDataModel { 
    CustName = g.Key.Name,
    City = g.Key.City,
    MaxBorrowed = g.Max(x => x.Price),
    Average = g.Average(x => x.Price),
    NumDays = 
        g.Sum(x => x.Price > 0 ? 1 : 0),
    ConsecutiveDays = //???
}).ToList();

Basically I want to count the number of times within the date span that a given customer made a purchase two days or more in a row. So, start with Day 1, and compare it to Day 2; if Price > 0 for both days, iterate a counter by one. Then check Day 2 against Day 3 with the same criteria, and repeat for as many records as I have for that customer. The counter should not reset to zero if a zero or null Price value is encountered, but it should reset for the next customer.

I found this SO Post asking something similar, but there's got to be an easier way. I'm using EF Core 5.

Also, full disclosure, this post is a continuation from a previous post . Since the answer to this question might not be as simple as I hope, a second post seemed the better way.

Answer 1

This query is going to require a FromSqlRaw execution of an SP to make this work.