ORA-00937: not a single-group group function说明及解决方法(E文)

最新推荐文章于 2018-11-14 14:10:33 发布

转载最新推荐文章于 2018-11-14 14:10:33 发布 · 3.1w 阅读

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#function #include #list #user #sql

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本文介绍了在SQL中正确使用分组函数（如COUNT等）的方法，并通过实例演示了如何解决因同时使用分组函数与未分组的列而产生的错误。通过添加GROUP BY子句，可以有效地对数据进行分组并统计每组的数量。

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A SELECT list cannot include both a group function, such as AVG, COUNT, MAX, MIN, SUM, STDDEV, or VARIANCE, and an individual column expression, unless the individual column expression is included in a GROUP BY clause.

Drop either the group function or the individual column expression from the SELECT list or add a GROUP BY clause that includes all individual column expressions listed.

eg:

SQL> select owner, count(*)
2 from dba_segments;
select owner, count(*)
*
ERROR at line 1:
ORA-00937: not a single-group group function

Because we have a group function (COUNT) in our column list, and an additional column (OWNER), we have to include the GROUP BY clause in our select statement.

SQL> select owner, count(*)
2 from dba_segments
3 group by owner;

OWNER                            COUNT(*)
------------------------------ ----------
USER1                              166
USER2                              166