lzth.net
当前位置:首页 >> C list join >>

C list join

C#中也有String.Join 方法,可以对数据进行操作,MSDN中定义如下: 在指定 String 数组的每个元素之间串联指定的分隔符 String,从而产生单个串联的字符串。 命名空间: System程序集: mscorlib(在 mscorlib.dll 中) 语法 public static stri...

from A in DFZFORMT055 join B in FM_CODE_LIST on A.MoneyType = B.ITEM_VALUE AND B.FORM_KIND = 'DFZ.FORM.T055' AND B.FIELD_NAME= 'MoneyType' join C in JOIN FM_CODE_LIST on A.PayMentType = C.ITEM_VALUE AND C.FORM_KIND = 'DFZ.FORM....

第二种:select * from student inner join teacher on student.id=teacher.sid...select a.id,a.name,b.id,b.name,c.id,c.name from a,b,c where a....

select a.no as 学生ID,a.name as 学生名字,c.subname as 科目名称, b.score as 学生成绩 from A a left join B b on a.no = b.no left...

所有信息,无论你使用什么关联都可以,join/ left join/right join/full join 从你写的表结构看,表D表示个A表、B表、C表的关系(除非表D还有其他三张...

select t1.*, t2.*, t3.* from t1 inner join t2 on t1.联接字段 = t2.联接字段 inner join t3 on t3.联接字段 = t1或t2的联接字段 where 其他查询条件(如果有的写,没有就去掉这部分)

select A.属性,B.属性,C.属性 from (A left join B on A.属性=B.属性) left join C on A.属性=C.属性; select中的A.属性是表示你想要显示的属性名字,比如ID,name等等(B.属性,C.属性同理)。供参考。

from A in DFZFORMT055 join B in FM_CODE_LIST on A.MoneyType = B.ITEM_VALUE AND B.FORM_KIND = 'DFZ.FORM.T055' AND B.FIELD_NAME= 'MoneyType'join C in JOIN FM_CODE_LIST on A.PayMentType = C.ITEM_VALUE AND C.FORM_KIND = 'DFZ.FORM.T...

IQueryable result = from c in db.GetTable() join t in db.GetTable() on new { id = c.ID, id1 = c.ID } equals new { id = t.ClassID, id1 = id } select new ClassInformation { ID = c.ID, ClassID = t.ClassID, Name = c.Name, TeacherNa...

多表连接查询按要查的结果而定 第一个,就是普通的连接查询,等同于 select C.字段一 , count(A.主键) from Table A inner join Table B on A.B的主键 = B.主键 inner join Table C on B.C的主键 = C.主键 group C.字段一 或 select C.字段一 , ...

网站首页 | 网站地图
All rights reserved Powered by www.lzth.net
copyright ©right 2010-2021。
内容来自网络,如有侵犯请联系客服。zhit325@qq.com