SQL错误：ORA-01489：字符串连接的结果是太长

Question

我下面的查询工作：

select ip.intake_id, 
     ip.estimated_years, 
     ip.gender_code, 
     LISTAGG(ip.race_code, ',') WITHIN GROUP (ORDER BY ip.race_code) as race_code, 
     eth.ethnicity_code, 
     i.living_arrangements, 
     p.dep_actv_military_flag, 
     LISTAGG(ale.allegation_super_type_code) WITHIN GROUP (ORDER BY ale.allegation_super_type_code) as maltreatment_type_code, 
     LISTAGG(ale.initial_report_disp_code) WITHIN GROUP (ORDER BY ale.initial_report_disp_code) as maltreatment_dispo_lvl, 
     ip.deceased_flag, 
     LISTAGG(ch.characteristic_code, ',') WITHIN GROUP (ORDER BY ch.characteristic_code) as chara_codes, 
     LISTAGG(ich.intake_characteristic_code, ',') WITHIN GROUP (ORDER BY ich.intake_characteristic_code) as intake_chara_codes, 
     pe.removed_date,cm.petition_submitted_flag,cm.created_date,atr.person_id 
from intake i inner join intake_participant ip on i.intake_id = ip.intake_id 
     left outer join reporter r ON i.intake_id=r.intake_id 
     left outer join ethnicity eth on eth.person_id = ip.person_id 
     left outer join person p on p.person_id = ip.person_id 
     left outer join allegation ale on ale.intake_id = i.intake_id 
     left outer join characteristic ch on ch.person_id = ip.person_id 
     left outer join intake_characteristic ich on ich.intake_id = i.intake_id 
     left outer join placement_episode pe on pe.child_id = ip.person_id 
     left outer join complaint cm on cm.petitioner_id = ip.person_id 
     left outer join attorney atr on atr.person_id = ip.person_id 
     left outer join intake_participant_role apr on apr.intake_participant_id = ip.intake_participant_id 
group by ip.intake_id,ip.estimated_years,ip.gender_code,eth.ethnicity_code,i.living_arrangements,p.dep_actv_military_flag, 
    ip.deceased_flag,pe.removed_date,cm.petition_submitted_flag,cm.created_date,atr.person_id 

当我运行此查询我收到以下错误信息：

Error report: 
SQL Error: ORA-01489: result of string concatenation is too long 
01489. 00000 - "result of string concatenation is too long" 
*Cause: String concatenation result is more than the maximum size. 
*Action: Make sure that the result is less than the maximum size. 

但是当我删除行：从我的查询

left outer join reporter r ON i.intake_id=r.intake_id 

则执行没有任何错误信息。工作查询如下：

select ip.intake_id, 
     ip.estimated_years, 
     ip.gender_code, 
     LISTAGG(ip.race_code, ',') WITHIN GROUP (ORDER BY ip.race_code) as race_code, 
     eth.ethnicity_code, 
     i.living_arrangements, 
     p.dep_actv_military_flag, 
     LISTAGG(ale.allegation_super_type_code) WITHIN GROUP (ORDER BY ale.allegation_super_type_code) as maltreatment_type_code, 
     LISTAGG(ale.initial_report_disp_code) WITHIN GROUP (ORDER BY ale.initial_report_disp_code) as maltreatment_dispo_lvl, 
     ip.deceased_flag, 
     LISTAGG(ch.characteristic_code, ',') WITHIN GROUP (ORDER BY ch.characteristic_code) as chara_codes, 
     LISTAGG(ich.intake_characteristic_code, ',') WITHIN GROUP (ORDER BY ich.intake_characteristic_code) as intake_chara_codes, 
     pe.removed_date,cm.petition_submitted_flag,cm.created_date,atr.person_id 
from intake i inner join intake_participant ip on i.intake_id = ip.intake_id 
     left outer join ethnicity eth on eth.person_id = ip.person_id 
     left outer join person p on p.person_id = ip.person_id 
     left outer join allegation ale on ale.intake_id = i.intake_id 
     left outer join characteristic ch on ch.person_id = ip.person_id 
     left outer join intake_characteristic ich on ich.intake_id = i.intake_id 
     left outer join placement_episode pe on pe.child_id = ip.person_id 
     left outer join complaint cm on cm.petitioner_id = ip.person_id 
     left outer join attorney atr on atr.person_id = ip.person_id 
     left outer join intake_participant_role apr on ipr.intake_participant_id = ip.intake_participant_id 
group by ip.intake_id,ip.estimated_years,ip.gender_code,eth.ethnicity_code,i.living_arrangements,p.dep_actv_military_flag, 
    ip.deceased_flag,pe.removed_date,cm.petition_submitted_flag,cm.created_date,atr.person_id 

我不确定为什么会出现此错误。有人能帮我弄清楚这个问题吗？我从这些链接link1和link2得到了相同的问题，但我没有从这些链接得到解决我的问题。

Answer 1

表格“记者”的加入可能会增加记录数（只有在列“intake_id”不是“记者”的唯一键时才会出现这种情况）。通过增加记录数量，可以生成更多的字符串，LISTAGG必须在每个组内连接在一起。如果连接字符串的总长度超过4000字节，则LISTAGG将失败并显示错误。

Answer 2

让我们采取一种不同的方法：就像当您汇总汇总并加入其他表格时一样，有时您必须在实现额外的一对多连接之前实现结果，以避免因汇总而人为膨胀连接表中的多条记录。这种方法假设您不需要因附加表连接而发生的重复。

我认为通过创建内联视图，race_Code的结果将符合大小限制。这也可以使用CTE完成。简而言之，如果您不需要记录重复，则可能需要先单独实现listAgg结果，然后再将它们重新加入。如果其他listAggs存在其他问题，则可能需要创建多个CTE，然后加入它们所有这些都结束了。这种方法只是使用内联视图。

select B.intake_id, 
     B.estimated_years, 
     B.gender_code, 
     B.race_code, 
     eth.ethnicity_code, 
     B.living_arrangements, 
     p.dep_actv_military_flag, 
     LISTAGG(ale.allegation_super_type_code) WITHIN GROUP (ORDER BY ale.allegation_super_type_code) as maltreatment_type_code, 
     LISTAGG(ale.initial_report_disp_code) WITHIN GROUP (ORDER BY ale.initial_report_disp_code) as maltreatment_dispo_lvl, 
     B.deceased_flag, 
     LISTAGG(ch.characteristic_code, ',') WITHIN GROUP (ORDER BY ch.characteristic_code) as chara_codes, 
     LISTAGG(ich.intake_characteristic_code, ',') WITHIN GROUP (ORDER BY ich.intake_characteristic_code) as intake_chara_codes, 
     pe.removed_date,cm.petition_submitted_flag,cm.created_date,atr.person_id 
from (SELECT ip.intake_id, 
     ip.estimated_years, 
     ip.gender_code, 
     ip.deceased_flag, 
     ip.person_id, 
     ip.intake_participant_id, 
     LISTAGG(ip.race_code, ',') WITHIN GROUP (ORDER BY ip.race_code) as race_code, i.living_arrangements 
     FROM intake i 
     INNER JOIN intake_participant ip on i.intake_id = ip.intake_id 
     GROUP BY ip.intake_id, ip.estimated_years, ip.gender_code, 
       i.living_arrangements, ip.deceased_flag, ip.person_id,     
       ip.intake_participant_id) B 
left outer join ethnicity eth on eth.person_id = B.person_id 
left outer join person p on p.person_id = B.person_id 
left outer join allegation ale on ale.intake_id = B.intake_id 
left outer join characteristic ch on ch.person_id = B.person_id 
left outer join intake_characteristic ich on ich.intake_id = i.intake_id 
left outer join placement_episode pe on pe.child_id = B.person_id 
left outer join complaint cm on cm.petitioner_id = B.person_id 
left outer join attorney atr on atr.person_id = B.person_id 
left outer join intake_participant_role apr on ipr.intake_participant_id = B.intake_participant_id 
GROUP BY ip.intake_id,ip.estimated_years,ip.gender_code, eth.ethnicity_code,i.living_arrangements,p.dep_actv_military_flag, ip.deceased_flag,pe.removed_date,cm.petition_submitted_flag, cm.created_date,atr.person_id