如何将SQL查询转换为Linq查询？

Question

SELECT DISTINCT Title,
                ProductDescription,
                COUNT(1) as Duplicate
FROM DB_Deals
GROUP BY Title, ProductDescription
HAVING COUNT(1) > 1;

Answer 1

好吧，如果是EF，你的意思是使用LINQ to Entities ...

进行查询

from deal in context.DB_Deals
group deal by new { deal.Title, deal.ProductDescription } into dealGroup
where dealGroup.Count() > 1
select new {
    dealGroup.Key.Title,
    dealGroup.Key.ProductDescription,
    Duplicate = dealGroup.Count(),
}

假设context是您的DbContext，DB_Deals是您的映射表名。

见

• Entity Framework T-Sql "having" Equivalent
• Group By Multiple Columns