将 SQL 查询迁移到实体框架时遇到问题

Question

我有这个 SQL 查询，但我无法将它转移到 linq 查询实体框架。

SELECT 
    RB.CustomerId AS ID, C.FullName AS 'FULL NAME', 
    C.PhoneNumber AS 'PHONE NUMBER', 
    COUNT(RB.CustomerId) AS BOOKS 
FROM  
    RentedBooks RB
JOIN 
    Customers C ON RB.CustomerId = C.Id
GROUP BY  
    C.FullName, C.PhoneNumber, RB.CustomerId;

Answer 1

以下代码相当于您在 linq 中的查询：

var query = db.RentedBooks.GroupBy(x => new { x.Customer.FullName, x.CustomerId ,x.Customer.PhoneNumber })
.Select(x => new { ID = x.Key.CustomerId,
        x.Key.FullName,
        ,x.Key.PhoneNumber,Books = x.Count() });