[英]MySQL select from multiple records only records with first and last date
I have a table HC_RSPI_data : 我有一个表HC_RSPI_data :
| RADIO_TYPE | HOP | TOWARDS | RSPI | TP_NAME | DATE_TIME_END | TIME_LENGTH | RLTM_min | RLTM_max |
|------------|-------|---------|------|---------------|------------------------|-------------|----------|----------|
| FlexiMetro | H3376 | RAPSANI | RSPI | ODU 1 Radio 1 | June, 08 2015 00:00:00 | 86400 | 65 | 37 |
| FlexiMetro | H3376 | RAPSANI | RSPI | ODU 1 Radio 1 | June, 09 2015 00:00:00 | 86400 | 70 | 37 |
| FlexiMetro | H3376 | RAPSANI | RSPI | ODU 1 Radio 1 | June, 08 2015 00:00:00 | 86400 | 65 | 37 |
| FlexiMetro | H3376 | RAPSANI | RSPI | ODU 2 Radio 2 | June, 10 2015 00:00:00 | 86400 | 74 | 47 |
| FlexiMetro | H3376 | RAPSANI | RSPI | ODU 2 Radio 2 | June, 09 2015 00:00:00 | 86400 | 74 | 47 |
| FlexiMetro | H3376 | RAPSANI | RSPI | ODU 2 Radio 2 | June, 08 2015 00:00:00 | 86400 | 74 | 47 |
And i want to get the records with the first and last day like: 我想获得第一天和最后一天的记录,例如:
| RADIO_TYPE | HOP | TOWARDS | RSPI | TP_NAME | DATE_TIME_END | TIME_LENGTH | RLTM_min | RLTM_max |
|------------|-------|---------|------|---------------|------------------------|-------------|----------|----------|
| FlexiMetro | H3376 | RAPSANI | RSPI | ODU 1 Radio 1 | June, 08 2015 00:00:00 | 86400 | 65 | 37 |
| FlexiMetro | H3376 | RAPSANI | RSPI | ODU 1 Radio 1 | June, 10 2015 00:00:00 | 86400 | 70 | 37 |
| FlexiMetro | H3376 | RAPSANI | RSPI | ODU 2 Radio 2 | June, 08 2015 00:00:00 | 86400 | 74 | 47 |
| FlexiMetro | H3376 | RAPSANI | RSPI | ODU 2 Radio 2 | June, 10 2015 00:00:00 | 86400 | 74 | 47 |
OR 要么
One record with 2 fileds Start date and End date like: min(DATE_TIME_END)
as Start date and max(DATE_TIME_END)
as End date 一条记录,包含2个文件的开始日期和结束日期,例如:
min(DATE_TIME_END)
作为开始日期, max(DATE_TIME_END)
作为结束日期
How can i achieve this? 我怎样才能做到这一点? I was trying something like this
我正在尝试这样的事情
SELECT DISTINCT rssi.*
FROM HC_RSPI_data as rssi
INNER JOIN HC_RSPI_data as j
on rssi.RADIO_TYPE = j.RADIO_TYPE
and rssi.HOP = j.HOP
and rssi.TOWARDS = j.TOWARDS
and rssi.RSPI = j.RSPI
and rssi.TP_NAME = j.TP_NAME
and rssi.DATE_TIME_END = j.DATE_TIME_END or j.DATE_TIME_END = DATE_ADD(rssi.DATE_TIME_END, INTERVAL 6 DAY)
Any ideas? 有任何想法吗?
One method is to aggregate the data and use a join
to get the appropriate values: 一种方法是聚合数据并使用
join
获取适当的值:
SELECT rssi.*
FROM HC_RSPI_data rssi INNER JOIN
(SELECT RADIO_TYPE, HOP, TOWARDS, RSPI, TP_NAME,
MIN(DATE_TIME) as mindt, MAX(DATE_TIME) maxdt
FROM HC_RSPI_data
GROUP BY RADIO_TYPE, HOP, TOWARDS, RSPI, TP_NAME
) j
ON rssi.RADIO_TYPE = j.RADIO_TYPE and
rssi.HOP = j.HOP and
rssi.TOWARDS = j.TOWARDS and
rssi.RSPI = j.RSPI and
rssi.TP_NAME = j.TP_NAME
rssi.DATE_TIME in (j.mindt, j.maxdt);
To get one row with start and end Date: 要获得包含开始日期和结束日期的一行:
SELECT rssi.RADIO_TYPE, rssi.HOP, rssi.TOWARDS, rssi.RSPI, rssi.TP_NAME,
MIN(rssi.DATE_TIME_END) as mindt, MAX(rssi.DATE_TIME_END) as maxdt
FROM HC_RSPI_data as rssi
GROUP BY rssi.RADIO_TYPE, rssi.HOP, rssi.TOWARDS, rssi.RSPI, rssi.TP_NAME
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.