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RhodiumToad's profile
RhodiumToad
RhodiumToad
RhodiumToad
@RhodiumToad

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RhodiumToad

@RhodiumToad

Find me on IRC: #postgresql or #freebsd on http://freenode.net . (he/him)

Joined February 2019

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    1.  🔎Julia Evans 🔍‏ @b0rk 16 Oct 2019
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      the steps in a left joinpic.twitter.com/YSFAdxFl1D

      20 replies 339 retweets 1,490 likes
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    2.  🔎Julia Evans 🔍‏ @b0rk 16 Oct 2019
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      a problem with this explanation is that you _can_ join on an arbitrary boolean condition ((a = b or c = d) and e <= f +2) but honestly I never do that and find it super confusing to think about, I always just do JOIN ON table1.something = table2.something_else

      12 replies 4 retweets 84 likes
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    3. Randy Au‏ @Randy_Au 16 Oct 2019
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      Replying to @b0rk

      Some slightly more practical examples of arbitrary join conditions include: using CASE to do complicated row filtering, like left join table3 based on some relationship between table1 left join table2 (if t1 has val and t2 is null, join t3 else null) also have fun w/ random()

      1 reply 0 retweets 5 likes
    4. David H. Clements‏ @waterprinciple 16 Oct 2019
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      Replying to @Randy_Au @b0rk

      My most common use case is AND statements, especially for tables with complex keys. Also done the odd FULL OUTER JOIN ON (TRUE), though that's a specialized use-case (I have one row from A that I want replicated across all records, but it may not exist).

      2 replies 0 retweets 0 likes
      RhodiumToad‏ @RhodiumToad 17 Oct 2019
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      Replying to @waterprinciple @Randy_Au @b0rk

      FULL OUTER JOIN ON (false) is surprisingly useful, sometimes known as a "union join".

      5:32 AM - 17 Oct 2019
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