數據庫多表連接查詢中使用group by分組語句，Expression #1 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'XXX' which is not functionally dependent on columns in GROUP BY claus - 碼上快樂

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數據庫多表連接查詢中使用group by分組語句，Expression #1 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'XXX' which is not functionally dependent on columns in GROUP BY claus

本文轉載自查看原文 2019-10-23 10:06 727 mysql

需求描述：

　　要是用兩表聯合查詢，並對查詢的結果進行分組：sql如下：

　　　　

 1 SELECT
 2 a.`id`,
 3 a.`fr_num`,
 4 b.`ent_status`
 5 FROM
 6 `table1` a
 7 LEFT JOIN `table2` b
 8 ON b.`fr_id` = a.`id`
 9 GROUP BY b.`fr_num`

　　這樣的sql語句會報錯結果如下：

　　Expression #1 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'a.id' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by.

　　問題處理：

　　首先了解一下sql的group by的用法：

　　1、select后面的查詢字段要么在group by后，要么是聚合函數

　　2、如果有條件對結果進行篩選，有兩種方式：(1) 先使用where + 條件，然后使用group by (2) 先使用group by，然后使用having進行結果篩選

　　解決：結合group by 的使用方法對sql進行改進就ok了~

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