Question

我正试图解决一个可能很简单的事情，根本就没有专家@mysql

我有第一张桌子'online_players'

mysql> show columns from online_players;
+-------------------+--------------+------+-----+---------+-------+
| Field             | Type         | Null | Key | Default | Extra |
+-------------------+--------------+------+-----+---------+-------+
| Agent             | varchar(255) | YES  |     | NULL    |       |
| Name              | varchar(255) | YES  |     | NULL    |       |
| Alias             | varchar(255) | YES  |     | NULL    |       |
| Begin_Date        | varchar(100) | YES  |     | NULL    |       |
| LastBalanceUpdate | varchar(100) | YES  |     | NULL    |       |
| Session_minutes   | varchar(100) | YES  |     | NULL    |       |
| Balance           | varchar(100) | YES  |     | NULL    |       |
| Product           | varchar(100) | YES  |     | NULL    |       |
+-------------------+--------------+------+-----+---------+-------+
8 rows in set (0.04 sec)

每3分钟进行一次droped，重新创建和值插入，它会显示当前正在播放的网站上的玩家...

然后我将此表'players_count'：

mysql> show columns from players_count;
+---------------+--------------+------+-----+---------+----------------+
| Field         | Type         | Null | Key | Default | Extra          |
+---------------+--------------+------+-----+---------+----------------+
| date_count    | varchar(50)  | YES  |     | NULL    |                |
| players_count | varchar(10)  | YES  |     | NULL    |                |
| product       | varchar(10)  | YES  |     | NULL    |                |
| avg_balance   | varchar(100) | YES  |     | NULL    |                |
| id            | int(11)      | NO   | PRI | NULL    | auto_increment |
+---------------+--------------+------+-----+---------+----------------+
5 rows in set (0.07 sec)

当更新表online_players时，使用特定插入更新表players_count：

USE livefeed;
INSERT INTO players_count(
date_count,players_count,product, avg_balance)
SELECT
now(),
count(Name) as Players,
Product,
Avg(Balance)
FROM
online_players
GROUP BY Product;

当列表1播放器在线时，它可以正常工作：

mysql> select * from players_count
    -> ;
+---------------------+---------------+---------+-------------+----+
| date_count          | players_count | product | avg_balance | id |
+---------------------+---------------+---------+-------------+----+
| 2016-03-28 17:09:02 | 2             | USD     | 0.06        | 1  |
| 2016-03-28 17:12:01 | 1             | USD     | 0.12        | 2  |
| 2016-03-28 17:15:00 | 1             | USD     | 0.12        | 3  |
| 2016-03-28 17:18:00 | 1             | USD     | 0.12        | 4  |
| 2016-03-28 17:21:01 | 1             | USD     | 0.12        | 5  |
| 2016-03-28 17:24:00 | 1             | USD     | 0.12        | 6  |
+---------------------+---------------+---------+-------------+----+
6 rows in set (0.21 sec)

但是我还想在没有玩家在线的情况下在表player_count中记录一行，即使我的查询高于= 0，例如：

+---------------------+---------------+---------+-------------+----+
| date_count          | players_count | product | avg_balance | id |
+---------------------+---------------+---------+-------------+----+
| 2016-03-28 18:01:00 | 0             | USD     | 0           | 7  |
| 2016-03-28 18:01:00 | 0             | FUN     | 0           | 8  |

我使用表players_count生成“实时”图表，并且每个特定日期需要有0个值。

可能很简单，但我没有在网上找到任何解决方案...... 我是如何修改我的插入/查询来做到这一点的？谢谢你的帮助

将查询值插入表中，即使查询中没有结果（插入0值）

0 个答案: