Question

我在dbvisualizer

中执行以下sql

Select column1,column2,column3 from table group by column3;

显示以下错误：

15:47:09  [SELECT - 0 row(s), 0.000 secs]  [Error Code: 979, SQL State: 42000]  ORA-00979: not a GROUP BY expression
... 1 statement(s) executed, 0 row(s) affected, exec/fetch time: 0.000/0.000 sec [0 successful, 0 warnings, 1 errors]

但是当我像以下那样查询时它会给出结果：

Select column1 from table group by column1;

查询或某些配置或支持问题是否存在语法错误。

Answer 1

在group by statement中，您应指定select中相同的列（总和，计数等除外）

所以你的查询

Select column1,column2,column3 from table group by column3;

应该是

Select column1,column2,column3 from table group by column1,column2,column3;

Answer 2

SELECT CLAUSE AND GROUP BY CLAUSE列就像HUSBAND AND WIFE。您在SELECT中执行的聚合操作是它们的子节点。我的意思是说SELECT和GROUP BY CLAUSE中应该有相同数量的列。它是拇指规则。

无法在dbvisualizer 6.5中运行“分组依据”查询

2 个答案: