Question

我在表格中有以下（示例）数据

价值，日期，设备

我使用这些数据进行简单的SLA计算，即工作时间内数据低于某个阈值的次数。

目前我运行以下两个查询，如下所示

select count(*), DATE(times) from SLA where device='some-dev' and DATE(times) between '2013-05-01' and '2013-05-31' and TIME(times) between '06:00:00' and '18:00:00' and value <150 group by DATE(times);

select count(*), DATE(times) from SLA where device='some-dev' and DATE(times) between '2013-05-01' and '2013-05-31' and TIME(times) between '06:00:00' and '18:00:00' group by DATE(times);

所以两个查询，一个没有值＆lt;数字和一个。

有几个问题，有没有办法将这两者都集中到一个查询中，所以我可以看到总数据点和数据点的数量小于阈值？基本上返回三列，一列有计数，一列有低于阈值的数字，日期

除此之外，还有一种简单的方法可以告诉mysql在返回数据时忽略周末吗？

谢谢，

Answer 1

使用UNION运算符。

更新的查询将如下所示：

(select count(*), DATE(times) from SLA where device='some-dev' and DATE(times) between '2013-05-01' and '2013-05-31' and TIME(times) between '06:00:00' and '18:00:00' and value <150 group by DATE(times))
UNION
(select count(*), DATE(times) from SLA where device='some-dev' and DATE(times) between '2013-05-01' and '2013-05-31' and TIME(times) between '06:00:00' and '18:00:00' group by DATE(times));

Answer 2

如果你正如你所写，你想要三列（两个计数和一个日期），请使用subselect而不是union：

select 
(select count(*) from SLA where device='some-dev' and DATE(times) = DATE(s.times) and  TIME(times) between '06:00:00' and '18:00:00' and value <150),
count(*), 
DATE(s.times) 
from SLA s
where device='some-dev' and DATE(times) between '2013-05-01' and '2013-05-31' and TIME(times) between '06:00:00' and '18:00:00' group by DATE(times)

我没有测试上面的查询，因此可能需要稍微调整，但请参阅simplified working example。

编辑：刚刚使用（甚至）更有意义的查询更新了链接小提琴（再次）。

Answer 3

select count(*), DATE(time) from SLA where (device='some-dev' and DATE(time) between '2013-05-01' and '2013-05-31' and TIME(times) between '06:00:00' and '18:00:00' and value <150 group by DATE(time)) or (device='some-dev' and DATE(times) between '2013-05-01' and '2013-05-31' and TIME(time) between '06:00:00' and '18:00:00' group by DATE(time));

Answer 4

怎么样：

select count(*), DATE(times) from SLA 
where (device='some-dev' and DATE(times) between '2013-05-01' and '2013-05-31' and TIME(times) between '06:00:00' and '18:00:00' and value <150 group by DATE(times))
or (device='some-dev' and DATE(times) between '2013-05-01' and '2013-05-31' and TIME(times) between '06:00:00' and '18:00:00' group by DATE(times));

Answer 5

我更喜欢ms-sql，但可能你可以这样做：

select count(*), DATE(times), SUM(CASE WHEN value <150  THEN 1 ELSE 0 END)
from SLA
where device='some-dev'
and DATE(times) between '2013-05-01' and '2013-05-31'
and TIME(times) between '06:00:00' and '18:00:00'
group by DATE(times);

在mysql中

。

如何组合来自同一个表的两个SQL查询

5 个答案: