select list is not in group clause

如果在MySQL中启用了only_full_group_by SQL模式，那么当查询中的选择列表、条件或顺序列表引用了组中未命名的非聚合列时，MySQL将拒绝执行这些查询，而不是依赖于它们的功能。(在5.7.5之前，MySQL没有检测到这个错误)。

举个例子，如果我们有以下SQL语句：select a, b, sum(c) from 'table_test' group by b;在这种情况下，如果没有使用方法来设置，也会导致报错，因为在MySQL中，如果使用了group by条件，查询中的列如果没有使用聚合函数，都需要放在group by子句中。所以我们可以修改SQL语句为：select a, b, sum(c) from 'table_test' group by a, b;

另一种解决方法是在SQL语句中添加any_value()函数，如下所示：select de.dept_no, max(s.salary) from dept_emp de left join salaries s on de.emp_no = s.emp_no group by de.dept_no;

总而言之，select list is not in group clause这个错误意味着在SQL查询中，选择列表中的列没有放在group by子句中，或者没有使用聚合函数。为了解决这个错误，我们需要将所有未命名的非聚合列都放到group by子句中，或者使用聚合函数来处理这些列。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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