sql - Oracle ORA-00979 - "not a GROUP BY expression"

Question

有人可以帮我解决这个特定的问题吗？我在尝试运行此命令时遇到 ORA-00979:

select   t0.title, count (1) as count0, (select   count (1)
      from contract c1, se se1
      where c1.c_id = se1.c_id
      and se1.svc_id = 3
      and se1.deleted = 0
      and c1.deleted = 0
      and c1.c_date between to_date ('07.10.2000', 'dd.mm.yyyy') 
                        and to_date ('22.11.2010', 'dd.mm.yyyy')
      and c1.company = 0
      and c1.tdata.tariff = c0.tdata.tariff
    ) as count1
  from contract c0, se se0, tariff t0
  where c0.c_id = se0.c_id
  and se0.svc_id = 3
  and se0.deleted = 0
  and c0.deleted = 0
  and c0.c_date between to_date ('21.11.2000', 'dd.mm.yyyy') 
                and to_date ('06.01.2011', 'dd.mm.yyyy')
  and c0.company = 0
  and t0.tariff_id = c0.tdata.tariff
  group by t0.title

Answer 1

问题出在您的带有 select count(1) 部分的子查询。仅仅因为它有一个计数，实际上并不意味着它是一个聚合。它仍然是一个将应用于每一行的子查询，正如您所看到的，它使用的值 c0.tdata.tariff 不属于该组。