Question

我有一个DataSet，其中两个表通过引用（Loop_id）连接

Table1
Column1  Column2        Loop_id
1        ItemCode_AAA     6
2        ItemCode_BBB     8

Table2
Column1       Loop_id
2014-Sep-09   6
2014-Nov-09   8

如何从两个表到单个表中检索除loop_id之外的所有列。结果表应该显示为

T1_Column1   T1_Column2       T2_Column1
1            ItemCode_AAA     2014-Sep-09
2            ItemCode_BBB     2014-Nov-09

我正在使用Net Framework 4.5

Answer 1

使用Linq to DataSets：

要枚举表格，请致电AsEnumerable。

DataTable table1 = ds.Tables["table1"];
DataTable table2 = ds.Tables["table2"];

var records = (from t1 in table1.AsEnumerable()
               join t2 in table2.AsEnumerable() 
                 on t1.Field<int>("Loop_id") equals t2.Field<int>("Loop_id") 
               select new {T1_Column1 = t1.Field<string>("Column1"),
                           T2_Column2 = t2.Field<string>("Column2"),
                           T2_Column1 = t2.Field<string>("Column1")});

Answer 2

使用View

或者你可以使用join

SELECT      T1.Column1 AS T1_Col ,   T1.Column2 AS T1_Col , T2.Column1 AS T2_Col

FROM            dbo.Table1 AS T1 RIGHT OUTER JOIN
                         dbo.Table2 AS T2 ON dbo.T1.Loop_id = dbo.T2.Loop_id

如何组合和检索数据集中两个表的多个列

2 个答案: