转换ms sql"group by"查询到linq到sql [英] converting ms sql "group by" query to linq to sql

问题描述

我有两个表，产品和类别.如何将以下sql查询转换为linq格式?

select c.Name, c.DisplayName, count(p.id) from categories as c
LEFT join products as p on p.categoryId = c.id
group by c.Name, c.DisplayName

某些类别中有0个产品，因此LEFT JOIN很重要

解决方案

如果在模型中正确定义了关系，那么customer表应该与所有产品都有关联，因此您将能够访问与之关联的产品客户仅使用"c.Products".然后应该能够简单地编写如下内容:

  var q = 
    from c in categories
    select new { c.Name, c.DisplayName, Count = c.Products.Count() }

T.

i have two tables, products and categories. how do i convert the following sql query to linq format?

select c.Name, c.DisplayName, count(p.id) from categories as c
LEFT join products as p on p.categoryId = c.id
group by c.Name, c.DisplayName

some categories will have 0 products in them so the LEFT JOIN is important

解决方案

if you correctly define the relations in your model then the customers table should have an association with all the products, so you'll be able to access products associated with the customer just using 'c.Products'. Then should be able to write simply something like this:

  var q = 
    from c in categories
    select new { c.Name, c.DisplayName, Count = c.Products.Count() }

T.

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