Calculate value per day - sql

Question

I have Oracle table where I insert data about network upload and download speed.
CREATE TABLE AGENT_HISTORY(
EVENT_DATE DATE,
NETWORK_UP NUMBER,
NETWORK_DOWN NUMBER
)
I want to generate Bar chart for last 30 days and display total upload traffic per day(24 hours).
select * from AGENT_HISTORY where EVENT_DATE >= SYSDATE - 30;
The problem which I don't know how to solve is how I can calculate the traffic for each day from the column NETWORK_UP. The result of the query should be 30 days with total upload traffic for each day. Is this possible without PL/SQL procedure?

Answer 1

You can do a query like this to aggregate totals data for both the network_up and network_down columns per day.
select trunc(event_day,'day') event_date
,sum(network_up) tot_network_up
,sum(network_down) tot_network_down
from agent_history
where event_day >= trunc(sysdate,'day') - interval '30' day
group by trunc(event_day,'day');
You can do it without embbeding the query in PL/SQL stored code depending on what you use for front end, in java you could you use something like this
Statement stmt = null;
String schema_name = 'abc';
String query = "select trunc(event_day,'day') event_date," +
"sum(network_up) tot_network_up," +
"sum(network_down) tot_network_down " +
"from " + schema_name +".agent_history " +
"where event_day >= trunc(sysdate,'day') " +
"- interval '30' day " +
"group by trunc(event_day,'day')"
try {
stmt = con.createStatement();
ResultSet rs = stmt.executeQuery(query);
while (rs.next()) {
String event_data = rs.getString("EVENT_DATE");
int tot_network_up = rs.getInt("TOT_NETWORK_UP");
int tot_network_down= rs.getInt("TOT_NETWORK_DOWN");
.....
}
catch (SQLException e) {
.......
} finally {
......
}
With something like this you just execute pure SQL.

Answer 2

My guess is that you just want to aggregate the data. Something like
SELECT trunc(event_date),
sum(network_up) total_up,
sum(network_down) total_down
FROM agent_history
WHERE event_date >= trunc(sysdate) - 30
GROUP BY trunc(event_date)
If that is not what you want, it would be very helpful to post some sample data, expected output, etc.