怎么把Oracle中两个select结果拼接在一起（横向拼接）

Question

两个无关联条件的结果进行拼接

Answer 1

with t1 as (select 1 from dual),

    t2 as (select 2 from dual)

select * from t1, t2

Answer 2

如果数据类型相似,可以使用as配合union来结合,例如
select c1 as a,c2 as b,null as c from t1 union
select cc1 as a,cc2 as b,cc3 as c from t2;
其中,使用null来确保连个select有相同的列数.
前提是两个select选择的同一列的数据类型相似.