1. Group-by，最简单的办法
select owner from all_objects group by owner;
2. 分析函数
select owner from (
select owner, row_number() over (partition by owner order by owner) rn
from all_objects
)
where rn=1;
select owner from all_objects group by owner;
2. 分析函数
select owner from (
select owner, row_number() over (partition by owner order by owner) rn
from all_objects
)
where rn=1;
来自 “ ITPUB博客 ” ，链接：https://blog.itpub.net/638844/viewspace-1062110/ ，如需转载，请注明出处，否则将追究法律责任。
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