使用如何檢索數據相結合的SQL

Question

我期待FR是這樣的：

Table 1: 

Column-A C-B C-C 
1   1 1 
2   5 2 
4   3 2 

Table 2: 

Column-D C-E 
1   3 
7   9 
6   5 


result set: 


1 1 
2 5 
4 3 
1 3 
7 9 
6 5 

Answer 1

select columnA, C-b from table1 
union all 
select columnD, C-E from table2 

Answer 2

試試這個

  select column1,column2 from tablename1 
      union all 
      select column3,column4 from tablename2