ORACLE分页及< 和>的区别

select *

  from (select t.*, rownum rn
        
          from (select * from t_kpi_fault order by obj_id asc) t
        
         where rownum <= 20)

 where rn > 10;

oracle  三层：

最内层排序

中间层最大条数

最外层最小条数

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&lt是小于等于（<=）

&gt是大于等于(>=)

 

select *from (select rownum num , t1.OBJ_ID,t1.alarmcause,t1.alarmlevel,t1.remark,t1.restype,t1.position,t1.root_status
        from (select * from T_KPI_FAULT_ALARM e where 1=1
        <if test="alarmcause != null and alarmcause != '' ">
            and alarmcause like '%'||#{alarmcause,jdbcType=VARCHAR}||'%'
        </if>
        <if test="alarmlevel != null and alarmlevel != '' ">
            and alarmlevel like '%'||#{alarmlevel,jdbcType=VARCHAR}||'%'
        </if>
        <if test="remark != null and remark != '' ">
            and remark like '%'||#{remark,jdbcType=VARCHAR}||'%'
        </if>
        <if test="restype != null and restype != '' ">
            and restype like '%'||#{restype,jdbcType=VARCHAR}||'%'
        </if>
        <if test="position != null and position != '' ">
            and position like '%'||#{position,jdbcType=VARCHAR}||'%'
        </if>
        <if test="root_status != null and root_status != '' ">
            and root_status like '%'||#{root_status,jdbcType=VARCHAR}||'%'
        </if>
        order by alarmcause ,remark,restype,position,root_status desc)t1 where rownum &lt; #{end})
        where num &gt; #{start}