Oracle 一个奇怪问题：将 A 的数据库导出后导入到 B 库，然后同一条 SQL 语句在 A（老库）能有查到结果，而 B 库找不到任何记录。

先贴出那条SQL语句：
SELECT /*+ use_nl(s, r) index_desc(s study_study_dttm_idx) */
s.study_key study_key,
s.patient_id patient_id,
s.patient_name patient_name,
s.patient_sex patient_sex,
TO_CHAR(s.patient_birth_dttm, 'yyyymmdd') birth_date,
s.patient_age patient_age,
s.study_instance_uid study_instance_uid,
s.study_id study_id,
TO_CHAR(s.study_dttm, 'yyyy-mm-dd') study_date,
TO_CHAR(s.study_dttm, 'HH24MISS') study_time,
s.access_no access_no,
s.study_desc study_desc,
s.refer_doctor refer_doctor,
s.read_doctor read_doctor,
s.attend_doctor attend_doctor,
s.consult_doctor consult_doctor,
s.perform_doctor perform_doctor,
s.other_patient_id other_patient_id,
s.other_patient_name other_patient_name,
s.institution institution,
s.department department,
s.study_size study_size,
NVL(s.series_count, 0) series_count,
NVL(s.instance_count, 0) instance_count,
s.modalities modality,
s.bodyparts bodypart,
s.source_aetitle source_aetitle,
s.study_priority study_priority,
s.study_comments userdef2,
s.patient_location patient_location,
s.patient_residency patient_residency,
s.patient_weight patient_weight,
s.patient_size patient_size,
s.study_reason study_reason,
s.request_doctor request_doctor,
s.request_code request_code,
s.request_name request_name,
TO_CHAR(s.request_dttm, 'yyyy-mm-dd (HH24:MI:SS)') request_dttm,
s.request_department request_department,
s.request_stat request_stat,
s.ed_stat ed_stat,
s.special_needs special_needs,
sp_user.get_user_name(s.verifier_key) verifier_name,
TO_CHAR(s.verify_dttm, 'yyyy-mm-dd (HH24:MI:SS)') verify_dttm,
TO_CHAR(s.admit_dttm, 'yyyy-mm-dd (HH24:MI:SS)') admit_dttm,
TO_CHAR(s.scheduled_dttm, 'yyyy-mm-dd (HH24:MI:SS)') scheduled_dttm,
TO_CHAR(s.register_dttm, 'yyyy-mm-dd (HH24:MI:SS)') register_dttm,
s.operators operators,
s.specialty specialty,
sp_user.get_user_name(s.treader_key) treader_name,
TO_CHAR(s.tread_dttm, 'yyyy-mm-dd (HH24:MI:SS)') tread_dttm,
sp_study.get_storage_status(s.study_key) storage_status,
s.study_stat study_stat,
sp_study.get_user_comments(s.study_key, 1) userdef1,
(SELECT dx_desc
FROM reportdx
WHERE report_key = r.report_key
AND ROWNUM = 1) dx,
(SELECT fx_desc
FROM reportfx
WHERE report_key = r.report_key
AND ROWNUM = 1) fx,
s.diagnosis diagnosis,
TO_CHAR(r.create_dttm, 'yyyy-mm-dd (HH24:MI:SS)') report_create_dttm,
TO_CHAR(r.dictate_dttm, 'yyyy-mm-dd (HH24:MI:SS)') report_dictate_dttm,
TO_CHAR(r.transcribe_dttm, 'yyyy-mm-dd (HH24:MI:SS)') report_transcribe_dttm,
TO_CHAR(r.approval_dttm, 'yyyy-mm-dd (HH24:MI:SS)') report_approval_dttm,
sp_user.get_user_name(r.transcriber_key) transcribe_name,
sp_user.get_user_name(r.dictator_key) dictate_name,
sp_user.get_user_name(r.reviser_key) reviser_name,
sp_user.get_user_name(r.approver_key) approve_name,
sp_user.get_user_name(r.creator_key) creator_name,
sp_report.find(s.study_key) report_key,
ROWNUM
FROM study s, report r
WHERE rownum <= 60
AND s.study_key = r.study_key(+)
AND series_count > 0
AND instance_count > 0
AND sts_stat != 'R'
AND study_dttm <=
TO_DATE('2014/02/19:09:25:45', 'YYYY/MM/DD:HH24:MI:SS')
AND (study_dttm <
TO_DATE('2014/02/19:09:25:45', 'YYYY/MM/DD:HH24:MI:SS') OR
(study_dttm =
TO_DATE('2014/02/19:09:25:45', 'YYYY/MM/DD:HH24:MI:SS') AND
(NVL(s.patient_id, '') < '728264' OR
(NVL(s.patient_id, '') = '728264' AND
(s.study_key + 0) < 16685480))))
AND study_dttm >=
TO_DATE('2014/02/17:00:00:00', 'YYYY/MM/DD:HH24:MI:SS')
AND study_dttm <=
TO_DATE('2014/02/20:23:59:59', 'YYYY/MM/DD:HH24:MI:SS')


对照过两个数据表结构好像是一样，好人求解！