如何选择一个表行，然后插入到另一个

Question

在SQL SERVER 2014中。

SQL查询

我想用FCD和Assembly两个表创建表FCD_Assembly。

我的桌子是这样的：

===================== ||组装表|| ========================

+-------------+-------+-------+-------+-------+-------+
| ID_Assembly | Col_1 | Col_2 | Col_3 | Col_4 | Col_5 |
+-------------+-------+-------+-------+-------+-------+
| 1200        | 0     | 0     | 1     | 0     | 0     |
| 1201        | 1     | 0     | 0     | 0     | 1     |
| 1202        | 0     | 1     | 0     | 0     | 0     |
| 1203        | 0     | 0     | 0     | 1     | 0     |
| 1204        | 0     | 1     | 0     | 0     | 1     |

===================== || FCD表|| ========================

+--------+--------+------+
| ID_FCD | Tittle | type |
+--------+--------+------+
| 1      | Col_1  | F    |
| 2      | Col_2  | F    |
| 3      | Col_3  | F    |
| 4      | Col_4  | C    |
| 5      | Col_5  | D    |

===================== || FCD_Assembly表格|| ========================

+-------------+-------------+
| ID_FCD      | ID_Assembly |
+-------------+-------------+
| 3           | 1200        |
| 1           | 1201        |
| 5           | 1201        |
| 2           | 1202        |
| 4           | 1203        |
| 2           | 1204        |
| 5           | 1204        |

我要创建表FCD_Assembly

感谢您的帮助：）

Answer 1

您需要对unpivot表使用Assembly，让列名成为行值，然后对join表执行FCD。

我会用CROSS APPLY来做unpivot。

SELECT f.ID_Assembly,t1.id 
FROM (
    select v.* from Assembly CROSS APPLY 
    (
        VALUES 
        (ID_Assembly,Col_1,'Col_1'),
        (ID_Assembly,Col_2,'Col_2'),
        (ID_Assembly,Col_3,'Col_3'),
        (ID_Assembly,Col_4,'Col_4'),
        (ID_Assembly,Col_5,'Col_5')
    )  v (id,val,Title)
    WHERE v.val <> 0
)t1 JOIN FCD f on t1.Title = f.Tittle

sqlifddle

结果

ID_FCD  ID_Assembly
3       1200
1       1201
5       1201
2       1202
4       1203
2       1204
5       1204