Oracle 伪列、取前几条记录、日期判断、触发器等

从表中随机取4条记录： sql select * from (select * from 表 order by dbms_random.random) where rownum < 5 伪列2type： select * from ( select ai.activityId,ai.owner,ai.creatorName, ai.subject,ai.createDate,2type from

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