sql中使用了group by时,select后面的字段可以不包含在Group By语句的后面么?
要一致,不然会报错
mysql> select jb from books group by name;
ERROR 1055 (42000): Expression #1 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'jm.books.jb' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by
mysql> select name from books group by name;
+------+
| name |
+------+
| lkj |
+------+
1 row in set (0.16 sec)
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