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SQL Query with count of duplicates

Posted on 2011-02-19
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Last Modified: 2012-05-11
I have trucks entereing different loading zones. Each time the truck enters a loading zone, it makes an entry into our mysql table witht the following fields:  id, truckName, date, latitude, longitude, speedInZone, zoneName. Through out the day the trucks will enter a leave the zone multiple times.  I need to pull the following data:

truckName, DateTime of last entry in this zone, zoneName, Count of how many times this truck entered this zone.

I am thinking maybe a group by truckName, zoneName may be the right direction but I need a little help.
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Question by:dtechfish
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3 Comments
 
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Accepted Solution

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tigin44 earned 500 total points
ID: 34934896
try this

SELECT truckName, MAX(date) AS lastentry, zoneName, COUNT(*)
 FROM yourTable
 GROUP BY truckName, zoneName
 
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LVL 41

Expert Comment

by:Sharath
ID: 34934904
try this.
select id,zonename,count(*) cnt,max(date) last_entry
  from your_table
 group by id,zonename

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if you did not get what you are looking for, provide some sample data with expected result.
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LVL 41

Expert Comment

by:Sharath
ID: 34934908
replace id with truckname in my query. tigin got it
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