GROUP BY不起作用

Question

请告知为什么小组不在这里工作。 我希望它按setup_time分组：

mysql> select i_connection, avg(setup_time) from CDR_Vendors where i_env = 9 group by i_connection order by setup_time asc limit 15;
+--------------+-----------------+
| i_connection | avg(setup_time) |
+--------------+-----------------+
|            0 |          0.0000 |
|          351 |          0.0000 |
|          235 |         11.9830 |
|          376 |         77.3151 |
|          396 |        168.3036 |
|          318 |         99.0741 |
|          319 |        126.4138 |
|          317 |        366.6881 |
|          545 |       2523.9878 |
|          551 |       4811.5482 |
|          485 |       3410.2093 |
|          289 |        692.0000 |
|          239 |       4314.1667 |
|          510 |       3322.8444 |
|          546 |       2041.7491 |
+--------------+-----------------+

Answer 1

select i_connection, avg(setup_time) from CDR_Vendors where i_env = 9 group by setup_time order by setup_time asc limit 15;

您可以按＆＃39; i_connection＆＃39;进行分组。