order a query by days of week starting with monday
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Thread: order a query by days of week starting with monday

  1. #1
    Join Date
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    order a query by days of week starting with monday

    hello. suppose a table XYZ has a column buydate. and there are 14 rows in it, 2 for each day of the week. if i would like to sort a query by days of the week, but starting from monday, how would i be able to do that? i have tried this query :
    select * from XYZ order by to_char(buydate,'D') ;

    this would bring sunday as the first row.
    i dont want sunday as the first row, i want monday.

    i am using oracle 10g database

  2. #2
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    / / / decode(to_char(buydate,'D') ,1,7,2,1,3,2,4,3,5,4,6,5,7,6,to_char(buydate,'D'))
    Pablo (Paul) Berzukov

    Author of Understanding Database Administration available at amazon and other bookstores.

    Disclaimer: Advice is provided to the best of my knowledge but no implicit or explicit warranties are provided. Since the advisor explicitly encourages testing any and all suggestions on a test non-production environment advisor should not held liable or responsible for any actions taken based on the given advice.

  3. #3
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    Another option:

    Code:
    order by decode(to_char(buydate,'D'), 1, 8, to_char(buydate,'D'))

  4. #4
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    thanks...but would you please also explain why you chose that approach? thanks

  5. #5
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    could you explain why you chose this approach?

  6. #6
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    Quote Originally Posted by umair123 View Post
    could you explain why you chose this approach?
    mmhh... may be because it solves the issue?
    Pablo (Paul) Berzukov

    Author of Understanding Database Administration available at amazon and other bookstores.

    Disclaimer: Advice is provided to the best of my knowledge but no implicit or explicit warranties are provided. Since the advisor explicitly encourages testing any and all suggestions on a test non-production environment advisor should not held liable or responsible for any actions taken based on the given advice.

  7. #7
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    You can also subtract one day from the date field where Sunday becomes Saturday and Monday becomes Sunday hence it would sort the days from Monday to Sunday.

    Code:
    select * from XYZ order by to_char(buydate-1,'D') ;
    this space intentionally left blank

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