SELECT column_name, aggregate_function(column_name)FROM table_name WHERE column_name operator value GROUP BY column_name 这里，通过GROUP BY将查询结果按照column_name列进行分组，以便计算每个组的聚合值。如果你尝试在没有GROUP BY的语句中使用此类操作，就会引发"not a group by expression"的错...
ORA-00937: not a single-group group function 原因:这句话不会运行,因为deptno要求每行都显示,而sum要求统计后再显示,违反了原则。在有组函数的select中,不是组函数的列,一定要放在group by子句中。 正确语句:select deptno,sum(sal) from emp group by deptno;...
* ERROR at line 1:ORA-00937: not a single-group group function 原因：这句话不会运⾏，因为deptno要求每⾏都显⽰，⽽sum要求统计后再显⽰，违反了原则。在有组函数的select中，不是组函数的列，⼀定要放在group by⼦句中。正确语句：select deptno,sum(sal) from emp group by deptno;
ORA-00937: not a single-group group function 原因: 句话不会运行,因为deptno要求每行都显示,而sum要求统计后再显示,违反了原则。在有组函数的select中,不是组函数的列,一定要放在group by子句中。 1、在有组函数的select中,不是组函数的列,一定要放在group by子句中。 问题解决: select ename,sum_sal fr...
ORA-00937: not a single-group group function 报错提示:非单组函数 报错原因:SELECT 后 既有表结构本身的字段,又有需要使用聚合函数(COUNT(),SUM(),MAX(),MIN(),AVG()等)的字段,就必须要用到group by分组,这里报错是因为没有使用group by分组。 解决方法:增加group by分组即可。 注:如果查询的字段只有...
Condom-associated erectile function, orgasm satisfaction, and global satisfaction predicted Time 2 CRAS in bivariate models, but none remained significant in the multivariable models. Age, having had a serious partner in the past 6 months, and HIV/PrEP status at Time 2 were significant predictors ...
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