Question

我想要加入两个表。但是，信息在第一个表中写为。

我的第一张表看起来像这样：

No. | Date       | From entry | To Entry |
+---+------------+------------+----------+
1   | 21.12.2013 | 3          | 10

我的第二张表看起来像这样：

| Entry  |  Code |
+--------+-------+
| 3      | 1     |
| 4      | 0     |
| 5      | 2     |
| 6      | 3     |
| 7      | 1     |
| 8      | 0     |
| 9      | 6     |
| 10     | 1     |

我想根据from到信息加入两者。结果应如下所示：

| Entry  | Code  | Date       |
+--------+-------+------------+
| 3      | 1     | 21.12.2013 |
| 4      | 0     | 21.12.2013 |
| 5      | 2     | 21.12.2013 |
| 6      | 3     | 21.12.2013 |
| 7      | 1     | 21.12.2013 |
| 8      | 0     | 21.12.2013 |
| 9      | 6     | 21.12.2013 |
| 10     | 1     | 21.12.2013 |

我不知道如何使用t-sql实现这一目标。

Answer 1

您只需要为INNER JOIN

指定正确的条件

SELECT          *
FROM            table1
INNER JOIN      table2 ON  table2.Entry >= table1.[From entry] 
                       AND table2.Entry <= table1.[To entry]

或者如果你想从table1返回所有记录，你可以考虑使用LEFT JOIN，无论它们是否在table2中有相关记录。

Answer 2

试试这个：（INNER JOIN和BETWEEN AND）

SELECT 
       Entry, Code, Date
FROM   
       Table1 T1 INNER JOIN
       Table2 T2
              ON T2.Entry BETWEEN T1.[From entry] AND T1.[To entry]

Answer 3

试试这个

Select table2.*,
table1.date
from table2
left join table1 on 
table2.entry between table1.fromentry and table1.toentry

SQLFIDDLE

Answer 4

这应该有效

SELECT  B.Entry,B.Code,A.Date
FROM    Table1 A CROSSJOIN Table2 B
WHERE   B.Entry >= A.[From Entry] AND B.Entry <= A.[To Entry]

Answer 5

SELECT Entry, Code, (SELECT T1.Date 
                    FROM FirstTable T1 
                    WHERE T1.Entry BETWEEN T2.[From Entry] 
                        AND T2.[To Entry]) AS Date
FROM SecondTable T2

SQL使用from到条目加入表

5 个答案: