sql join后，derive_table1中不存在列

Question

我写了这个sql代码来查询redshift中的数据

Select
  tenant_name, date, fk_organization_unit, active_member_per_studio, cn
From
(
  SELECT
    tenant_name, date, fk_organization_unit, active_member_per_studio
  from
    fct.st_member_development as st_member_development
  inner join
  (
    SELECT
      tenant_name as tn, fk_organization_unit as fk, type, date as dt, contract_count as cn
    from
      fct.st_contract_development
  )
    u
      on  st_member_development.tenant_name =u.tn
      and st_member_development.fk_organization_unit =u.fk
      and st_member_development.date =u.dt
)
  x
limit 5

我收到以下错误错误：“derivative_table1”中不存在列“cn”

我该如何解决这个问题

Answer 1

您收到此错误是因为第二个SELECT缺少列cn 。 试试这个：

Select tenant_name, date, fk_organization_unit, active_member_per_studio, cn

From (
SELECT tenant_name, date, fk_organization_unit, active_member_per_studio, cn   
from fct.st_member_development as st_member_development

inner join
(SELECT tenant_name as tn, fk_organization_unit as fk, type, date as dt, contract_count as cn from fct.st_contract_development) u
on  st_member_development.tenant_name =u.tn and st_member_development.fk_organization_unit =u.fk and st_member_development.date =u.dt
)
limit 5

Answer 2

您错过了内部查询中的cn列。

Select
  tenant_name, date, fk_organization_unit, active_member_per_studio, cn
From
(
  SELECT
    tenant_name, date, fk_organization_unit, active_member_per_studio, cn
  from
    fct.st_member_development as st_member_development
  inner join
  (
    SELECT
      tenant_name as tn, fk_organization_unit as fk, type, date as dt, contract_count as cn
    from
      fct.st_contract_development
  )
    u
      on  st_member_development.tenant_name =u.tn
      and st_member_development.fk_organization_unit =u.fk
      and st_member_development.date =u.dt
)
  x
limit 5