ORACLE 分页查询 并返回 记录条数

SELECT * FROM (

        SELECT A.*, ROWNUM RN  FROM (
        
                    SELECT 
                    c1,
                    c2,
                    count(*) over () total   -----依靠此句查出 数量总和
                    FROM TABLE_NAME
        
        ) A  WHERE ROWNUM <= 40
        
)WHERE RN >= 21

例子:

SELECT T.* FROM ( 


          SELECT ROWNUM AS ROWNO, R.* FROM( 


                  SELECT   
                   N.NRW_PER, TO_CHAR( N.MDATE ,'YYYY-MM'  )  MDATE ,N.OTITLE, N.OID,  N.CLSID, N. HB_PER 
                  ,L.LOST_PER LOST_PER , L.HB_PER LOST_HB_PER , L.LOST_POWER  LOST_POWER 
                  ,S.MFLOW AS S_MFLOW
                  ,G.MFLOW AS G_MFLOW
                  ,COUNT(*) OVER () total        
                  FROM DW_NRW_MONTH N  
                  LEFT JOIN DW_LOST_MONTH L ON L.MDATE = N.MDATE AND  L.OID = N.OID 
                  LEFT JOIN DW_SS_MONTH  S ON  S.MDATE = N.MDATE AND  S.OID = N.OID 
                  LEFT JOIN DW_GS_MONTH  G ON  S.MDATE = N.MDATE AND  G.OID = N.OID 
                  WHERE  1=1 
                  AND   N.NRW_PER >=0  AND   N.NRW_PER <=30  --区间
                  AND  N.MDATE >= TO_DATE('2018-01-01','YYYY-MM-DD') --开始时间
                  AND  N.MDATE <= TO_DATE('2018-01-02','YYYY-MM-DD') --结束时间 
                  AND   Exists (SELECT  MP_CHILDREN FROM dw_md_object_map_index  WHERE MP_PARENT =2 and MP_CHILDREN =   N.OID )  --父子级关系   
                  ORDER BY  MDATE                           
       


           ) R  WHERE ROWNUM <= 20
           
 
 ) T  WHERE T.ROWNO >= 5

结果: