Question

您好，我想显示值table1和table2中的值，并在datagridview中一起显示它们。但是我的输出显示的是重复值，而不是2个值，它又显示了4个具有相同值的值

query = "select receive_bardana.bales,receive_wheat.bags from receive_bardana
        inner Join receive_wheat
        On receive_bardana.id= receive_wheat.id
          where receive_bardana.id ='1'"

我的输出是：

+-------+------+
| BALES | BAGS |
+-------+------+
|  100  | 1000 |
| 1000  | 1000 |
|  100  | 2000 |
| 1000  | 2000 |
+-------+------+

我存储在表中的是：

+-----+-------+
| ID  | BALES |
+-----+-------+
|  1  |  100  |
|  1  | 1000  |
+-----+-------+

+-----+------+
| ID  | BAGS |
+-----+------+
|  1  | 1000 |
|  1  | 2000 |
+-----+------+

ID是两个表之间的关系。例如。我有两个下班族。
ID是ID号血腥之城
1 FOR GODOWN1
AND 2 GODOWN 2
主键是自动增加值。

Answer 1

您可以做的是添加一个额外的ID2行

query = "select receive_bardana.bales,receive_wheat.bags from receive_bardana
        inner Join receive_wheat
        On receive_bardana.id2 = receive_wheat.id2
          where receive_bardana.id ='1'"



|ID   |  ID2 | BALES
|  1  |  1   |  100 
|  1  |  2   |  1000
+-----+------+------+

|ID   |  ID2 | BAGS
|  1  |  1   |  1000
|  1  |  2   |  2000
+-----+------+------+

内部连接在输出中显示重复的行。它多次显示数据

1 个答案: