union
-- union 会对所有重复对内容去重
select
category
from
(
select
1 as category
union all
select
1 as category
)tmp
union
select
1 as category -- union 会对所有重复对内容去重
select
category
from
(
select
1 as category
union all
select
1 as category
)tmp
union
select
1 as category 相关推荐
牛客87317764...:知道现在最大的时代红利是什么?躺平,享受各种人口红利就完了。
0面是时代的问题,不是个人问题。