PostgreSQL 剔除表中重复数据

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如何简单有效的剔除数据表中重复的冗余数据呢?

select 
    * 
from 
    [表名] 
where 
    objectid in (
        select 
            max(objectid) 
        from 
            [表名] 
        group by 
            userid,createdate
    ) 
    and other option