Home/ Questions/Q 7897015
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-06-03T08:02:45+00:00

The timestamp field is a DATETIME column in a format like 2012-03-19 00:23:14 .

  • 0

The timestamp field is a DATETIME column in a format like 2012-03-19 00:23:14. How can I compare two rows of timestamps and find the larger one? The query below that I am using isn’t working.

UPDATE report 1 status = 'time is larger' WHERE EXISTS 
  (SELECT ip_src, layer4_sport, timestamp FROM  
      (SELECT ip_src, layer4_sport, timestamp from report 1) AS tmpb  
   WHERE  report 1.layer4_sport = tmpb.layer4_sport 
   AND report 1.ip_src = tmpb.ip_src  
   AND  report 1.timestamp > tmpb.timestamp 
   GROUP BY ip_src, layer4_sport,  timestamp HAVING COUNT(*) = 2)
Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    Thanks God, the query is OK now.

    The missing was SET syntax after table name, and also GROUP BY syntax should be omitted from EXISTS.

    UPDATE report 1 SET status = 'time is larger' WHERE EXISTS 
  (SELECT ip_src, layer4_sport, timestamp FROM  
  (SELECT ip_src, layer4_sport, timestamp from report 1) AS tmpb  
   WHERE  report 1.layer4_sport = tmpb.layer4_sport 
   AND report 1.ip_src = tmpb.ip_src  
   AND  report 1.timestamp > tmpb.timestamp)
    • 0