Question

select count (*) from
(select a.ACCOUNT_POID_ID0,a.STATUS as moov_profile_status,b.SUB_PLAN_ID,b.PLAN_ID,c.STATUS,c.NAME
from VMS_MOOV_PROFILE_T a, 
VMS_SUB_PLAN_NO_REGEN_T b,
VMS_VOUCHER_CONF_T c,    
where b.ACCOUNT_POID_ID0 = a.ACCOUNT_POID_ID0 
and c.VOUCHER_ID = (select f.VOUCHER_ID from VMS_PLAN_VOUCHER_T f where f.PLAN_ID = b.PLAN_ID));

这会返回错误。我如何计算行数？

Answer 1

Try this

SELECT count (*)
FROM   (SELECT a.ACCOUNT_POID_ID0,
               a.STATUS AS moov_profile_status,
               b.SUB_PLAN_ID,
               b.PLAN_ID,
               c.STATUS,
               c.NAME
        FROM   VMS_MOOV_PROFILE_T a,
               VMS_SUB_PLAN_NO_REGEN_T b,
               VMS_VOUCHER_CONF_T c
        WHERE  b.ACCOUNT_POID_ID0 = a.ACCOUNT_POID_ID0
               AND c.VOUCHER_ID = (SELECT f.VOUCHER_ID
                                   FROM   VMS_PLAN_VOUCHER_T f
                                   WHERE  f.PLAN_ID = b.PLAN_ID)) t

Answer 2

您的错误是：

您忘了告诉我们您收到的错误消息。
你忘了告诉我们你正在使用什么dbms。
有许多逗号（表别名c之后）。
根据dbms，您可能还需要派生表的名称（即在右括号后添加一些虚拟名称）。

更正的查询是：

select count (*) from
(
  select a.ACCOUNT_POID_ID0,a.STATUS as moov_profile_status,b.SUB_PLAN_ID,b.PLAN_ID,c.STATUS,c.NAME
  from VMS_MOOV_PROFILE_T a, 
  VMS_SUB_PLAN_NO_REGEN_T b,
  VMS_VOUCHER_CONF_T c
  where b.ACCOUNT_POID_ID0 = a.ACCOUNT_POID_ID0 
  and c.VOUCHER_ID = (select f.VOUCHER_ID from VMS_PLAN_VOUCHER_T f where f.PLAN_ID = b.PLAN_ID)
) dummy;

此外，您加入表的方式（使用VMS_PLAN_VOUCHER_T上的子查询）有点奇怪。而且你不应该使用二十多年前在标准SQL中替换的旧的逗号分隔连接语法。另外：无论如何，你都不需要派生表。

以下是您的简化查询：

select count (*)
from VMS_MOOV_PROFILE_T a 
join VMS_SUB_PLAN_NO_REGEN_T b on b.ACCOUNT_POID_ID0 = a.ACCOUNT_POID_ID0 
join VMS_PLAN_VOUCHER_T f on f.PLAN_ID = b.PLAN_ID
join VMS_VOUCHER_CONF_T c on c.VOUCHER_ID = f.VOUCHER_ID;

计算别名表的行数

2 个答案: