Hello,
I am trying to query the data set below for the data_value for the data_id of the recent data_date.
So for data_id 18554 the recent data_date will be 2/8/2016 18:40 and its data_value will be 29504.76
And for data_id 18555 the recent data_date will be 2/8/2016 18:40 and its data_value will be -90909090909 -
data_id data_name data_date data_value
-
18554 traffic_in 2/8/2016 18:30 30737.11333
-
18554 traffic_in 2/8/2016 18:10 31780.68
-
18554 traffic_in 2/8/2016 18:35 30338.82
-
18554 traffic_in 2/8/2016 18:15 31393.36667
-
18554 traffic_in 2/8/2016 18:40 29504.76
-
18554 traffic_in 2/8/2016 17:50 32225.28
-
18554 traffic_in 2/8/2016 18:00 32225.32
-
18554 traffic_in 2/8/2016 17:55 32240.71333
-
18554 traffic_in 2/8/2016 17:45 32602.98
-
18554 traffic_in 2/8/2016 18:20 30874.39333
-
18554 traffic_in 2/8/2016 18:25 30511.56
-
18554 traffic_in 2/8/2016 18:05 32090.84667
-
-
18555 traffic_in 2/8/2016 18:15 -90909090909
-
18555 traffic_in 2/8/2016 18:35 -90909090909
-
18555 traffic_in 2/8/2016 17:45 -90909090909
-
18555 traffic_in 2/8/2016 18:00 -90909090909
-
18555 traffic_in 2/8/2016 17:50 -90909090909
-
18555 traffic_in 2/8/2016 17:55 -90909090909
-
18555 traffic_in 2/8/2016 18:10 -90909090909
-
18555 traffic_in 2/8/2016 18:20 -90909090909
-
18555 traffic_in 2/8/2016 18:05 -90909090909
-
18555 traffic_in 2/8/2016 18:25 -90909090909
-
18555 traffic_in 2/8/2016 18:40 -90909090909
-
18555 traffic_in 2/8/2016 18:30 0.213333333
-
-
The results i want is -
data_id data_name data_date data_value
-
18554 traffic_in 2/8/2016 18:40 29504.76
-
18555 traffic_in 2/8/2016 18:40 -90909090909
-
But when i use the following MySQL statement -
SELECT data_id,data_name,max(data_date),data_value FROM `data_source_` where `data_id` IN (18554,18555) AND data_name = 'traffic_in'
-
this just gives me -
data_id data_name data_date data_value
-
18554 traffic_in 2/8/2016 18:40 29504.76
-
Help will be very much appreciated.
Thanks
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