SQL 与条件字段联合

Question

我有以下（简化）tables:

No0    |    No1    |    start0    |    end0
10000  |           |              |
19999  |           |     10000    |    19999
20000  |           |              |
29999  |           |     20000    |    29999


No0    |    No1    |    start0    |    end0
       |   11000   |              |     
       |   15950   |              |    15950
       |   16000   |              |

我如何UNION他们（或其他方法），但根据No1介于[=16之间] table 2日填写适当的No0 =] 和 end0 这样 returns:

No0    |    No1    |    start0    |    end0
10000  |           |              |
19999  |           |     10000    |    19999
20000  |           |              |
29999  |           |     20000    |    29999
19999  |   11000   |              |     
19999  |   15950   |              |    
19999  |   16000   |              |

Answer 1

在并集的下半部分，返回到 TableA，其中 No1 在 Start0 和 End0 之间。

举个例子：

select      ta.No0,
            ta.No1,
            ta.Start0,
            ta.End0
from        TableA  as  ta
union all
select      ta.No0,
            tb.No1,
            NULL as Start0,
            NULL as End0
from        TableB  as  tb
inner join  TableA  as  ta  on  tb.No1 between ta.Start0 and ta.End0;

SQLFiddle

SQL 与条件字段联合

SQL Union with Conditional Field

sql-server

union