SQLite - 带有联合的多个随机结果集

Question

我想做两个SQL查询并从每个查询返回随机结果,然后将它们组合在一起,有点像这样:

select colA, colB, colC
from tableA
order by random() limit 10

union all

select colA, colB, colC
from tableB
order by random() limit 10

它不允许我这样做.

Answer 1

其实我觉得我现在已经解决了这个问题.我实际上并不知道这个网站是如何工作的,但我通过做这样的事情来做到这一点:

select * from ( 
   select colA, colB, colC 
   from tableA 
   order by random() limit 10 
) 
union all 

select * from ( 
   select colA, colB, colC 
   from tableB 
   order by random() limit 10 
)