php - 更改 SQL 模式或编辑查询？

Question

自从最新更新以来，我收到此错误消息:

Failed to run query: SQLSTATE[42000]: Syntax error or access violation: 1055 Expression #2 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'table...' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by

我已经阅读过有关此问题的信息，并且我找到的线程是删除模式“only_full_group_by”

现在，这是最佳实践，还是我应该更改我的代码？

如果我想使用 mySQL 默认值，我的查询会是什么样子？

查询

$query = "SELECT es.datum, es.objekt_element, es.anteckn, es.objekt_nr
      FROM element_skanning es
      INNER JOIN 
               (
                SELECT objekt_element, anteckn, MIN(datum) AS min_datum
                FROM element_skanning
                WHERE datum LIKE '$this_year_month'
                GROUP BY objekt_element
                HAVING COUNT(*) > 1
               )
      dup ON es.objekt_element = dup.objekt_element
      ORDER BY dup.min_datum, es.objekt_element, es.datum;
";

Answer 1

您只需从内部查询的 SELECT 列表中删除 anteckn 即可修复查询。该值未被使用，因此不会影响您的结果:

$query = "SELECT es.datum, es.objekt_element, es.anteckn, es.objekt_nr
      FROM element_skanning es
      INNER JOIN 
               (
                SELECT objekt_element, MIN(datum) AS min_datum
                FROM element_skanning
                WHERE datum LIKE '$this_year_month'
                GROUP BY objekt_element
                HAVING COUNT(*) > 1
               )
      dup ON es.objekt_element = dup.objekt_element
      ORDER BY dup.min_datum, es.objekt_element, es.datum;
";

请注意，您还需要包含

es.datum = dup.min_datum

在您的 JOIN 条件中，如果(如图所示)您只想从 element_skanning 获取与 datum 的最小值相对应的行.