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query max and min with two situation, same and different date

Discussion in 'Database' started by newphpcoder, Dec 19, 2011.

  1. newphpcoder

    newphpcoder New Member

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    Hi..

    I know its a couple of weeks that i have problem in datetime..
    For example i have this data:
    00100 2011-11-20 05:35:00
    00100 2011-11-20 13:35:00
    00100 2011-11-21 21:35:00
    00100 2011-11-22 05:35:00
    when I tried this query for testing:
    Code:
    SELECT a.EMP_NO, max(a.DTR), min(b.DTR) FROM regular_dtr a LEFT JOIN regular_dtr b ON a.EMP_NO = b.EMP_NO;
    
    i have this output:
    EMP_NO--max_dtr------------------min_dtr
    00100----2011-11-22 05:35:00-----2011-11-20 05:35:00
    i need result is:
    EMP_NO--max_dtr------------------min_dtr
    00100----2011-11-20 13:35:00-----2011-11-20 05:35:00
    00100----2011-11-22 05:35:00-----2011-11-21 21:35:00
    I really, don't know what syntax should i need..
    I'm sorry if until now, I did not solve this:(
    Any help is highly appreciated..
    Thank you so much...i hope you would not angry with me...the reason why i post again this problem because now i only have two columns, EMP_NO and DTR(IN and OUT) and i have no right to demand to separate the data of in and out...so that in my part I need to do that but sad to say, I have only few knowledge in mysql..specially in functions.
     

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