oracle 根据时间字段查询数据
''' SELECT * FROM (SELECT CLXXBH, JGSK, CDBH, HPHM, HPYS, SBBH, KKMC, WD, JD, CLLX, CSYS, HPZL, CLSD, WFXW, HPTP, QJTP, RKSJ, XSFX, KKID FROM WFXX.WFXX WHERE RKSJ >= TO_DATE('%s', 'YYYY/MM/DD HH24:MI:SS') AND RKSJ < TO_DATE('%s', 'YYYY/MM/DD HH24:MI:SS') ORDER BY RKSJ) WHERE ROWNUM <= 2000 '''