Question

我有一个名为“ counter”的表，该表具有3个字段：


| Field  | Type       | Null | Key | Default | Extra          |
+--------+------------+------+-----+---------+----------------+
| id     | int(11)    | NO   | PRI | NULL    | auto_increment |
| record | datetime   | YES  |     | NULL    |                |
| passed | tinyint(1) | YES  |     | NULL    |                |
+--------+------------+------+-----+---------+----------------+

我存储在记录中的数据是这样的（传递的是布尔值）：

mysql> SELECT record, passed FROM counter;
+---------------------+--------+
| record              | passed |
+---------------------+--------+
| 2019-09-19 00:00:00 |      1 |

我想做的是一个查询，该查询总结了按小时和日期分组的传递字段有1次的次数。例如：

     Hour  | Date    |    passed
     13:00 2019-09-19      10

执行中：

SELECT HOUR (record), COUNT(*) as  passed FROM counter GROUP BY HOUR(record);

我得到那些结果

| HOUR (record) | passed |
+---------------+--------+
|             0 |     67 |
|            13 |    199 |
+---------------+--------+

问题在于13:00之后有记录，根本没有播种。

也为了获得我尝试过的日期：

SELECT DAY(record), COUNT(*), HOUR(record), COUNT(*) as  passed FROM counter GROUP BY HOUR(record);

我收到此错误

ERROR 1055 (42000): Expression #1 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'iot.counter.record' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by

如何归档所需的结果？

Answer 1

如果您不介意为日期和时间使用单个字段，则可以在此处使用DATE_FORMAT：

SELECT
    DATE_FORMAT(record, '%Y-%m-%d %H') AS ts,
    COUNT(*) AS passed
FROM counter
GROUP BY
    DATE_FORMAT(record, '%Y-%m-%d %H');

Answer 2

请尝试：

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Mysql GROUP BY查询。按日期和小时显示数据

2 个答案: