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MySQL-mariaDB

Discussion in 'MySQL' started by Calinghr, Oct 30, 2019.

  1. #1
    Hello,
    SEMrush
    I want to create a column where I can add one or two or three string variables. Something similar with the ENUM datatype but with ENUM I can add only one out of my defined variables.
    for example: I want to create a column where I can enter a list ( 'France','Germany', 'Italy') and from that list when I insert something into that column I want to be able to add : France or France and Germany or all 3 : France, Germany, Italy.
    How can I do that ??
    the SET datatype won't help me.. from what I've searched.
     
    Calinghr, Oct 30, 2019 IP
    SEMrush
  2. JEET

    JEET Well-Known Member

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    #2
    Not sure if I got your question properly, but why not storing strings in CHAR or in VARCHAR?
     
    JEET, Oct 30, 2019 IP
  3. Calinghr

    Calinghr Peon

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    #3
    Hello! Thanks for the reply.
    Because setting the column as a char/varchar data type won't help me.
    In my record, when I insert a statement I want to have, for example :
    upload_2019-10-31_10-8-1.png

    with a varchar/char data type defined for the Country column I cannot add that statement : ' France, italy, Germany' .
     
    Calinghr, Oct 31, 2019 IP
  4. Andrii Ozemko

    Andrii Ozemko Greenhorn

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    #4
    are you sure that you want to have such structure? Such approach violates database normalization. It is better to have three different rows in the database, like
    200 France
    200 Germany
    200 Italy
     
    Andrii Ozemko, Oct 31, 2019 IP
  5. Calinghr

    Calinghr Peon

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    #5
    Hi ! yeah... I thought about this as well. Probably I will go with this approach, having 3 rows. Thanks !!
     
    Calinghr, Oct 31, 2019 IP
  6. Calinghr

    Calinghr Peon

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    #6
    However... do you have any idea how I can do that ? having 3 countries on the same row ?
     
    Calinghr, Nov 5, 2019 IP
  7. Andrii Ozemko

    Andrii Ozemko Greenhorn

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    #7
    Of course, you can find technical solution to do it in a way you have described. I do not recommend doing that strongly. Yes, you will solve some problems you are straggling with, but then you face with different problems. Mostly with data consistency.
    My suggestion - 2 tables
    --------------------------
    Countries Table:
    id Name

    1 Germany
    2 Italy
    3 France
    --------------------------
    Prices Table
    Id CountryId Price

    1 1 200
    2 2 200
    3 3 200
    --------------------------
    Then you can use Sql query like

    select Countries.Name
    from Prices
    left join Countries on Countries.Id=Prices.CountryId
    where Prices.Price=200

    So, to store date you should use normalized database. Than to get string like "Italy, Germany, France" you should use Sql query.
     
    Andrii Ozemko, Nov 5, 2019 IP
  8. Calinghr

    Calinghr Peon

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    #8
    Thanks !!
     
    Calinghr, Nov 6, 2019 IP