Sql Insert into select from子句导致“无法插入多行错误”

我使用insert into select from子句向表中插入数据，但它不起作用

请看这里：

insert into STAGES_ROLES_REL
              select 
                  (select stage_id 
                   from
                  (select ws2.workflow_stage_id as stage_id
                         from
                        ( select ws.workflow_stage_name as workflow_stage_name
                          from   workflow_stages ws
                          join   stages_roles_rel sr
                            on   ws.workflow_stage_id = sr.workflow_stage_id ) table1
                  join workflow_stages ws2    
                  on   table1.workflow_stage_name =  ws2.workflow_stage_name
                  order by ws2.workflow_stage_id))
             ,role_id
             ,current_date created_date, user created_by
             ,null modified_date, null modified_by
              from stages_roles_rel

错误是无法插入多行，但我不知道如何放置筛选器和获取单个行

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非常感谢你的帮助

我猜这个查询将返回多个结果：

select stage_id
    from (
      select ws2.workflow_stage_id as stage_id
      from (
        select ws.workflow_stage_name as workflow_stage_name
        from workflow_stages AS ws
        inner join stages_roles_rel AS sr
          on ws.workflow_stage_id = sr.workflow_stage_id
        ) AS table1
      inner join workflow_stages ws2    
      on table1.workflow_stage_name =  ws2.workflow_stage_name
      order by ws2.workflow_stage_id
    )

如果您希望从该查询中删除多行，请将常量移动到该查询中，并删除外部查询：

insert into STAGES_ROLES_REL
select
  stage_id,
  role_id,
  current_date AS created_date,
  user AS created_by,
  null AS modified_date,
  null AS modified_by
from (
  select ws2.workflow_stage_id as stage_id
  from (
    select ws.workflow_stage_name as workflow_stage_name
    from workflow_stages AS ws
    inner join stages_roles_rel AS sr
      on ws.workflow_stage_id = sr.workflow_stage_id
    ) AS table1
  inner join workflow_stages ws2    
  on table1.workflow_stage_name =  ws2.workflow_stage_name
  order by ws2.workflow_stage_id
    )
   [add a cross join to the original table if that's what you're wanting, I don't know the intent of your original query]

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否则，您需要修复查询，使其仅返回一行。

您的错误很可能是子查询返回的行数不能超过erow，因为您有标量子查询，无法控制返回的行数。是的，我知道它返回多行，但如何逐个提取行？