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Editorial Team
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Asked: 2026-05-23T09:30:15+00:00

If I have records in a table that are timestamped how do I query

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If I have records in a table that are timestamped how do I query so that I get the results for each day for each user as a row in the resultset along with additional info from another table?

Example:

batch_log

id  |  userid | batchid | start_time         | end_time            |time_elapsed
----------------------------------------------------------------------------------
1   |  bob    | 123sgd  |2011-06-23 18:00:00 | 2011-06-23 18:12:00 | 00:12:00
2   |  jim    | 234sgd  |2011-06-22 12:00:00 | 2011-06-22 12:12:00 | 00:12:00
3   |  bob    | 1234gd  |2011-06-23 19:00:00 | 2011-06-23 19:08:00 | 00:08:00
4   |  bob    | 1Abeds  |2011-06-22 19:00:00 | 2011-06-23 20:24:00 | 00:24:00

screwups

id  |  userid | time_of_screwup
---------------------------------------------
1   |  bob    |2011-06-23 19:29:16 
2   |  jim    |2011-06-23 16:29:24
3   |  bob    |2011-06-22 12:29:16 
4   |  bob    |2011-06-23 13:29:16

How do I select so that I can get both the time elapsed and the number of screwups daily for each person so that I can feed this into excel.

Example output:

  userid | date       |COUNT(time_elapsed)| COUNT(screwups)|
------------------------------------------------------------
  bob    | 2011-06-23 | 00:20:00          |   2
  jim    | 2011-06-22 | 00:12:00          |   1
  bob    | 2011-06-22 | 00:24:00          |   1

EDIT: Data that makes more sense

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1 Answer

  1. Editorial Team

    Having an id field on your results doesn’t really make sense, so I’ll just ignore that that field exists. Similarly, I doubt that time_elapsed will be the same for different job runs on the same day, so we’ll knock that out.

    Getting rid of those two fields leaves us with a fairly straightforward GROUP BY query. I don’t know the specifics of your database so, for the purposes of this problem, I’ll assume that your DB has a DATE() function that returns the date part of a timestamp. Unless you left out important details in your question , the existence of the batch_log table is a red herring. You really just want to SELECT userid, DATE(time_of_screwup), count(*) FROM screwups GROUP BY userid, DATE(time_of_screwup).

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