Show HN: SQL Noir – Learn SQL by solving crimes

(sqlnoir.com)

463 points | by chrisBHappy 278 days ago

41 comments

  • RvdV 277 days ago
    I like it! Very fun! Few ideas:

    - The "submit" box isn't clear on whether it needs the name or the suspect id for the first case

    - It would be nice to have a "copy to notes" button in the output

    - It would be nice to have some docs on what functions are available / which dialect this is.

    I think this very valuable, it's so much more easy to learn if you actually have a small project to work on

    • caro_kann 277 days ago
      > - The "submit" box isn't clear on whether it needs the name or the suspect id for the first case

      I think it's implemented to be general, they wrote what to submit in 'Objectives' section though. For me as a user, I deduced that they wanted "suspect" name, after all, this is a detective game.

  • worble 278 days ago
    This is super fun!

    One small thing which would be nice is the ability to just download the sqlite database myself so I could use my preferred application to query it, and just use the site for the brief, notes and submission.

    Also a nitpick, while you say it's for "learning" SQL, I would probably expect something a little more guided, or at least some example queries, if the intention was to teach SQL. As it stands, if you don't know SQL you're probably going be completely lost as to what you should be doing. It's really cool, just not specifically as a learning tool.

  • laowantong 277 days ago
    A great addition to a field where there aren't many offerings: SQL Island (https://sql-island.informatik.uni-kl.de) and SQL Murder Mystery (https://mystery.knightlab.com) come to mind. The mechanism of SQL Noir is close to that of the latter, i.e., an undirected, essentially standalone adventure. I myself am working on SQLab, a SQL game engine that allows you to augment an arbitrary base with exercises on that base to produce directed, standalone adventures: https://github.com/laowantong/sqlab. You download a dump of the database (currently MySQL, SQLite, Postgres), and can play under any administrator interface. On the same page there's a link to the long police investigation I designed for my (French) students. If you're a teacher or researcher in the field, the principles of SQLab are explained here: https://arxiv.org/abs/2410.16120.
  • Terr_ 278 days ago
    This gives me a childhood flashback to a show called MathNet, an educational police procedural (a la Dragnet) where both investigators have holstered calculators.

    https://en.m.wikipedia.org/wiki/Mathnet

    • nedrylandJP 277 days ago
      and there were infamous hackers too

      https://youtu.be/vNhBq3kjq_Q?t=2011

      • Terr_ 277 days ago
        Taking advantage of an extra that wasn't charged to the customer?

        Ah, that's a classic "use after free" vulnerability.

    • bhollan 277 days ago
      I cannot even tell you how many glorious memories this brings up! Thanks for a walk down memory lane.
  • wbakst 278 days ago
    Love this! The style is unique and awesome.

    I see the beginnings of a really fun way to learn / practice / remember SQL.

    A few notes:

    - Would be cool if it was a single workspace (no tabs). Was constantly switching tabs back and forth.

    - Saving previous SQL queries and results would be cool. I was copying results into the notes. Feel like this is important as things get more complex.

    Excited to see where you take this!

    • chrisBHappy 277 days ago
      Good notes indeed. I have just implemented a side by side view so that you can view 2 tabs at once. I hope this helps. Also as other users suggested you can use the notes for saving queries but you can also comment them out in the editor.
      • wbakst 277 days ago
        I love the updates! Side-by-side is great, the graph view is great. Awesome stuff! Thanks for sharing.
    • dylan604 277 days ago
      > - Saving previous SQL queries and results would be cool. I was copying results into the notes. Feel like this is important as things get more complex.

      I imagined myself with my flip notepad at the crime scene taking notes every time I'd copy queries/results to the notepad section. All I needed was a hat, and then say "just the facts, ma'am" a couple of times.

      • wbakst 277 days ago
        I like that way of thinking about it!
  • fodkodrasz 277 days ago
    The idea is good, but the UI is all but immersive.

    Things that would it make more immersive:

    - autocomplete

    - and/or the ability to view the schema alongside the query (on a wide enough screen)

    - a way to copy table and column names easily with a click (table names cannot be selected at all!)

    - ability to just add more queryies under/over the already executed ones, instead of only being able to replace them.

    • tiu 277 days ago
      Agree with all but autocomplete should either be a hidden feature or disabled by default since I think it takes away from the immersion as well forces you to recall.

      Maybe enabled on a NG+?

    • chrisBHappy 277 days ago
      Thank you for the suggestions. I have just implemented the following: - Side by Side view to open up two different tabs at the same time - Copy button to copy table names
      • fodkodrasz 277 days ago
        Great job! I'm happy if I could provide useful feedback. I wish you luck, this is a fun learning tool!
    • jkubicek 277 days ago
      Commenting out blocks of code with command-/ would be super useful as well
  • 8mobile 277 days ago
    Wow what a great idea, I had fun solving the cases. I think maybe a comic version would help junior programmers. The SQL editor sometimes behaves strangely and does not allow correct writing. Thanks
  • kaeruct 277 days ago
    The editor behaves weirdly when I try to add comments.

    It's hard to explain, but you can reproduce like this:

    1. Write several lines, for example:

      select i.*, s.*
      from interviews i
      join suspects s
      on s.id = i.suspect_id
    
    
    2. Try to comment each line on its own by typing -- in front of each line.

      -- select i.*, s.*
      from interviews i
      join suspects s
      on s.id = i.suspect_id
    
    
    
      -- select i.*, s.*
      -- from interviews i
      join suspects s
      on s.id = i.suspect_id
    
    
    3. As soon as you do it for "from interviews i", that line will move itself to the previous line, and the syntax highlighting will be broken
    • chrisBHappy 277 days ago
      Indeed. I think I just fixed this bug.
  • doruk101 278 days ago
    When I was in university, my instructor linked something like this for SQL practice (a crime solving minigame, just like this one).

    I remember getting really into it, even going to the extreme of trying to find the most efficient one-liner solution.

    Thanks for making this. I’ll be passing the torch by linking it to anyone interested in learning SQL.

  • chocks 278 days ago
    This is pretty fun, I tried the two free mysteries and was fun solving them. One nit, would be nice if the SQL editor supported comments so we can comment out old queries before running new one so as keeping a history esp if we need to run the same queries again. Good stuff :)
    • chrisBHappy 278 days ago
      You should be able to add -- and comment out lines of queries. If not, this is a bug that I will investigate. Also you can use the Notes tab to store any past queries and findings.
      • mymacmachine 278 days ago
        Hey!

        Firstly - great work - one of my favourite games is Chronicles of Crime and this immediately made me think back to how I would've gone about investigating some of those stories using SQL.

        w.r.t the comments - you can add `--` to comment out lines of queries but when I do it on two or more lines they get mashed into a single line and I can't reliably uncomment them again without the queries getting mangled.

        I've found you can use multiline comments /* and */ though which worked for me - just a bit more back and forth on the keyboard.

        Anyway - again - awesome work.

        • chrisBHappy 278 days ago
          Thank you very much. That's actually a great suggestion. I completely forgot about that. As for the single line comments, indeed this is a bug, I'll try to fix it.
      • pledg 278 days ago
        It works for the first line, but doing it on a second seems to make it merge lines.
        • chrisBHappy 277 days ago
          Yep. This was a bug. I just fixed it.
  • agumonkey 278 days ago
    • chrisBHappy 278 days ago
      An honorable mention. This was in fact my inspiration for creating SQL Noir.
  • ryanianian 278 days ago
    Really cute. But I really want the ability to put the different tabs -- Brief, Workspace, Schema -- side-by-side. I know SQL and wanted to play with this, but the UX was frustrating enough to drive me away, even though it is really pretty.
    • __float 278 days ago
      +1 to this. Remembering the schema is kind of a big barrier when you're just jumping in, and that's when you want to be able to explore at random the most.

      (I also struggled with the schema because crime_scene was singular and suspects was plural!)

    • SlackingOff123 278 days ago
      I agree. I also wish it was possible to run multiple queries in the same window e.g.:

        select * from crime_scene;
        select * from suspects;
      • sgarland 278 days ago

            SELECT
              cs.*,
              s.*
            FROM crime_scene cs
            FULL JOIN
              suspects s ON cs.id = s.id;
        
        This maintains zero relationship between the tables, of course, but it shows you both. You could also specify individual columns.
    • chrisBHappy 277 days ago
      Yes! I just implemented a "Side By Side" view that will enable you to view 2 separate tabs side by side. Only on Desktop.
    • chrisBHappy 278 days ago
      That's a good suggestion. I'm not sure if screen real estate won't be a problem though.
      • hinkley 278 days ago
        Maybe modeled after browser dev tools. Big display at the top, small repl at the bottom with a dragged to resize. Also tab structure and the “menu” are chewing up a lot of vertical real estate for two classes of data most users won’t see as separate.

        The schema ui seems to be big because of the graph display… which is not at all done baking yet. The hard part of displaying graphs is the pathing, and the very first one I opened has an arrow coming from the left, going across the mode, and attaching to the right side. In a perfectly horizontal line. That’s gonna need to cook a lot longer. It it worth having a bad vis over having no vis?

        • chrisBHappy 277 days ago
          Just implemented it. Looks really nice on Desktop. Nice and compact.
  • deanebarker 278 days ago
    This is really lovely. It makes me happy that you invested time into building this for other people.
  • Factory 277 days ago
    On case #4: select * from phone_records where caller_id= 11 or recipient_id = 11

    The results header is screwed up, there is an extra 'id' column. At least on firefox.

  • hobs 278 days ago
    Something is weird in at least firefox. Type or paste:

      select \* 
      from crime_scene;
    
    then TYPE so you add a comment

      select \* 
      from crime_scene;
      --
    
    I see

      select ----from---------------- 
    
    but when I select the text I see what I wrote - I like the comment my text (and I was pulling in the instructions) but it renders some interesting garbage pretty fast.
    • chrisBHappy 278 days ago
      Thank you for pointing that out. Will look into it.
  • yesthisiswes 278 days ago
    This is cool! Great job! I completed the first challenge.

    I guess I’m used to sql server management studio I tried running multiple queries at once and wasn’t able to. I also tried writing a comment with two dashes to keep track of the id’s and it replaced most of my query with dashes. It might have something to do with being on mobile on iOS.

    • chrisBHappy 277 days ago
      Thanks for pointing that out. I just fixed the single line comments. It should work as expected now.
      • yesthisiswes 277 days ago
        Awesome thanks! I’ll give the second challenge a go
  • haliskerbas 278 days ago
    I just shared this with folks, it looks incredible! I’m giving it a try myself too.

    By the way, I was trying to use a bunch of one-liner SQL statements to explore the data, and it seems like the editor doesn’t handle comments very well. Is there a way to make it work better?

    • chrisBHappy 277 days ago
      Yep, comments are broken. Currently working on a fix.
  • hinkley 278 days ago
    Feature request:

    Badges for completing challenges.

    Issue Closed, Won’t Fix.

    Badges?? We don’t need no stinking badges!

  • hotfrost 277 days ago
    I'm a big SQL noob, so I barely know what I'm doing, but... I managed to crash both Firefox and Edge whenever I ran this query:

      select * from crime_scene, suspects
    • mhuffman 276 days ago
      >select * from crime_scene, suspects

      This is a cross-join. It is the equivalent of a nested loop in programing and almost never what you want to do in a database unless you like watching high-combination data spewing out and CPUs burning. It gives you every combination of items in each table you name.

      What you want is to find something in two or more of those tables that can be linked together somehow using (very likely!) "INNER JOINS". Look into examples or tutorials of those on the internet and use what you find to work through the tables on the "investigations". Luckily, the SQL Noir site tells you exactly the steps to take in the first case. You need to find a link somehow between the crime_scene and suspects tables and then another one between the matching suspects from the suspects table and the interviews table.

      Note: there is no direct easy link between the crime_scene and suspects tables. You will have to use your investigation skills to trim the suspects list down.

  • scns 277 days ago
    Great fun, thank you for building this! Was confused since submitting the confession didn't work, would make sense to ask for the name of the person no?
  • yoda97 278 days ago
    That was fun! One question, is there a way to execute the current hovered/selected query and not the first on in the workspace?
    • chrisBHappy 278 days ago
      You can try commenting out the first query with -- and running it like that. I have not implemented yet the ability to run multiple queries.
  • c6p 274 days ago
    I like it, looking forward to new cases.

    On case #004, even though I found the killer by occupation and the confession. Person 57 does not give me any clue about a Lamborghini, as the solution text mentions. Is there a bug, or what did I miss?

  • Foofoobar12345 277 days ago
    Nice work. Just what I need to train the non-tech ppl in my team. Wish more things were fun to learn like this.
  • Gazoche 277 days ago
    Oh this is perfect. I was just looking for exercises to practice my SQL, and detective games are my jam.
  • RandomUser4976 278 days ago
    This is so much fun! I’m going to play this with my kids ages 6, 8, 10, and 12. Thank you for your efforts!
  • webninja 277 days ago
    How do you make money doing this and if you earn nothing, how can you afford to in this economy?
    • dylan604 277 days ago
      hobby--noun--An activity that one enjoys doing in one's spare time.

      also: https://en.wikipedia.org/wiki/Hobby

    • solumunus 277 days ago
      The bitterness is palpable.
    • chrisBHappy 277 days ago
      Glad you asked. I don’t want to put a price tag on it because I believe everyone should have access to learning for free. The right to learn shouldn’t be behind a paywall. That said, I’ve added a ‘Buy Me a Coffee’ link for anyone who wants to support the project. No pressure, just an option!
  • rockfishroll 278 days ago
    I solved all of them. Minor nitpick: Since every criminal confesses to their crime, the fastest way to solve most of these is to query the confessions table for strings like '%i did%' or '%kill%'.
    • chrisBHappy 277 days ago
      Haha. You found a cheat code I guess. I would have to think of hiding the answers from plain sight for the next cases or adding some more rows that include these specific strings.
    • sprobertson 277 days ago
      That's how I solved #3, still trying to reverse-engineer the correct solution.
      • dylan604 277 days ago
        Isn't that the reversed method? You mean you're now trying to solve the crime the normal way instead of jumping to the last page of the book first?
        • sprobertson 277 days ago
          Hmm it still feels apt, reverse-engineering anything is effectively starting at the last page of the book.
  • vojtechrichter 275 days ago
    So much fun! Looking forward to more complex investigations.
  • wagslane 278 days ago
    haha this is such a cool aesthetic! nice work.

    education needs more stuff like this - less matter-of-fact regurgitation of information (which ai does an okay job of anyhow) and more creativity.

  • exabrial 277 days ago
    Just wanted to say this is awesome! sent it to a few coworkers
  • gregorvand 277 days ago
    Fun! Nice work and will be great to intro newbies to SQL
  • normie3000 277 days ago
    When I click on SQL Workspace, I get an error:

    > Failed to load database Can't find variable: WebAssembly

    • chrisBHappy 277 days ago
      Oh wow. That's strange. What browser are you using?
      • normie3000 276 days ago
        Safari, with lockdown mode enabled.
  • jppope 278 days ago
    this is awesome! soooo fun. Thank you for building this. Sharing it immediately
  • vim-guru 277 days ago
    What a great idea!
  • sgarland 278 days ago
    This is very nice, thank you for making it.
  • dylan604 277 days ago
    tables: crime_scene, witnesses, interviews, suspects. one of these is not like the others.

    I've seen it advised to list table names as plurals as it holds more than one of the things. I've been told plural is dumb. I've not yet run into mixed plurals and singular table names. Sure, it's a style, but pick one???

    I'm guessing this is like tabs vs spaces, but would a tab person use spaces randomly or vice versa?

    otherwise, it's a fun way to kill some time. clearly, i played with it long enough to notice this little bitty bit of something. however, if only modern police departments had this ability to link clues. there's no way to drip donut cremes or spill coffee on these notes

    • chrisBHappy 277 days ago
      Thank you for pointing that out. During the creation of the cases I did not take much consideration on naming the tables. I will either make all of them plural or singular.
  • arlanrakh 277 days ago
    congrats!
  • Geezus_42 277 days ago
    I'm on mobile, so maybe I'm missing something, but I don't understand how youbare even supposed to get started without knowing SQL. If this is supposed to teach SQL then there needs to be some tutorial to guide the way.
    • dylan604 277 days ago
      Some games require reading of the instructions before playing. Not all games are Candyland or Chutes&Ladders simple. Sometimes you need a bit of basic knowledge gathering to play the most basic levels of the game.

      There's also plenty of ways to teach. Some methods assume a basic level of the concepts involved, but by continuing, you'll be exposed to new concepts that level up those skillz. Just like how arithmetic comes before algebra comes before trig comes before calculus.

    • thomaspark 277 days ago
      Querymon is a more tutorial-like SQL game:

      https://www.youtube.com/watch?v=kkP_W8xFz5s

    • abrookewood 277 days ago
      Agreed, but there is a suggested query to get you started at each step.
  • bertoltW 276 days ago
    [dead]
  • bertolt 276 days ago
    [dead]