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List:       haskell-beginners
Subject:    Re: [Haskell-beginners] (SPAM 3)Re:  (SPAM 3)Re: database, list result, extraction and conversion
From:       Francesco Ariis <fa-ml () ariis ! it>
Date:       2018-12-07 8:59:56
Message-ID: 20181207085956.2tmvjeczk23gf5d4 () x60s ! casa
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On Fri, Dec 07, 2018 at 09:44:03AM +0100, Damien Mattei wrote:
>  let noBD = fromOnly (Prelude.head bd_rows)
> 
> give me a solution, but i'm still searching a solution with map has in a
> list there could be more than one result...

So put this in your code

    let noBD = map _ bd_rows

`_` will tell the compiler "tell me which type goes there". Then you
can choose the appropriate function!
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