ORA-30454: summary contains STDDEV without corresponding SUM & COUNT ORACLE 报错 故障修复 远程处理
文档解释
ORA-30454: summary contains STDDEV without corresponding SUM & COUNT
Cause: Incremental refresh of summaries with STDDEV(X) requires COUNT(X) and SUM(X) columns to be included in the summary definition
Action: Make sure that the required columns are part of the summary definition if incremental refresh capability is desired.
ORA-30454错误表明用户试图执行一个包含了汇总函数STDDEV的查询,而不存在汇总函数SUM及COUNT,从而导致这个错误。
官方解释
当组内查询(group by queries)中包含STDDEV聚合函数,而不包含聚合函数SUM及COUNT:ORA-30454:summary contains STDDEV without corresponding SUM & COUNT
常见案例
在ORACLE中,使用STDDEV函数计算同一组个数的标准偏差时,多数情况下都需要汇总函数SUM及COUNT,如果缺失其中任何一个函数,即会报ORA-30454:summary contains STDDEV without corresponding SUM & COUNT的错误。
比如:
select stdDev (sal)
from emp
group by deptno;
一般处理方法及步骤
正确处理ORA-30454:summary contains STDDEV without corresponding SUM & COUNT错误的方法是在组内查询中同时使用汇总函数SUM及COUNT。
比如:
select sum(sal), count(sal), stdDev (sal)
from emp
group by deptno;