A little help with sql to linq query:复制 SELECT t1.*, t2.* t3.SomeField FROM table1 t1 RIGHT JOIN table2 t2 ON t1.DataId = t2.DataId LEFT JOIN table3 t3 ON t3.FDataId = dl.FDataId WHERE t1.DataId = 11 AND t1.FDataId = 3 How too?... Also, I started to use ...
全连接(Full Outer Join),Linq并不支持,所以就需要使用其它方法来实现,就像不支持全连接的数据库一样,先使用内连接找出公共的部分,然后分别找出左连接和右连接的部分,把这三部分的结果UNION一下,即可得到全连接的效果。看问题:1 2 3 4 5 6 7 8 9 ID FirstName -- --- 1 John 2 Sue ID LastName ...
我们知道在SQL中一共有五种JOIN操作:INNER JOIN、LEFT OUTER JOIN、RIGHT OUTER JOIN、FULL OUTER JOIN、CROSS JOIN 1>先创建两个表Group、User,两表的关系是N:N 2>测试数据 3>连接大全 Linq实现LEFT OUT JOIN 原文地址:http://geekswithblogs.net/AzamSharp/archive/2008/04/07/121103.aspx ...
EntityFramework 使用Linq处理内连接(inner join)、外链接(left/right outer join)、多表查询 2016-12-08 17:42 −... CharlesShang 0 5555 inner join(内连接)、left join(左连接)、right join(右连接)、full join(全连接)区别 2019-12-25 19:37 −sql中的连接查询有inner join(内连接)、left join...
场景:在实际的项目中使用EntityFramework都会遇到使用Ef处理连接查询的问题,这里做一些小例子如何通过Linq语法处理内连接(inner join)、外连接(left/right outer join); 废话不多说先看实体类: 1.内连接: Linq: varquery =fromstincontext.SchoolBoysjoinglincontext.SchoolGirlsonst.GirlfriendIdequalsgl.Idselectnew{...
Linq join right join left join,代码:usingSystem;usingSystem.Collections.Generic;usingSystem.Linq;usingSystem.Text;usingSystem.Data;usingSystem.Reflection;namespaceTestConsole{publicclass
//left join (right join只是顺序换一下) from a in StoreInCities join b in CityInfo on a.CityId equals b.ID into c //DefaultIfEmpty()是为了达到左连接的目的,不使用DefaultIfEmpty(),相当于是inner join from d in c.DefaultIfEmpty() select d //上面的left join等价于下面的方法语法...
https://docs.microsoft.com/en-us/dotnet/framework/data/adonet/ef/language-reference/method-based-query-syntax-examples-join-operators** **Perform left outer joinshttps://docs.microsoft.com/en-us/dotnet/csharp/linq/perform-left-outer-joins** **...
FULL JOIN [Desc] ON Student.ID=[Desc].ID corss join: SELECT * FROM Student CORSS JOIN [Desc] linq: 读取全部 from student in db.Student from desc in db.Desc select new { student, desc }; 读取指定字段 from student in db.Student from desc in db.Desc select new { ID = student.ID,...
Converting SQL to LINQ, Part 9: Full Outer Join (Bill Horst) VBTeam February 18, 2008 New Data Repeater Control in Latest Power Packs Release! (Beth Massi) Beth Massi This post assumes you’ve read the previous posts in this series.After...