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Re:Show HN: Select Star SQL, an interactive SQL book by S_A_P on Monday September 03, 2018 @11:41PM (#17906468)
I really like this. Bookmarked. I have spotted a few bugs that you may want to check into.

Search the page for the word “llanguage”. The sum/count checker told me it was incorrect for using lowercase nulls. I normally write all my sql lowercase for brevity, but I also mostly use sql server.

I really like what you have done here and I hesitate to report it in your show hn thread because this really is great.

Re:Show HN: Select Star SQL, an interactive SQL book by zckao on Tuesday September 04, 2018 @12:16AM (#17906595)
Thanks so much for the feedback! Both the typo and the validity-checking bug have been fixed.
Re:Show HN: Select Star SQL, an interactive SQL book by chris_wot on Monday September 03, 2018 @11:46PM (#17906490)
Constructive criticism and commentary is one of the most valuable parts of Show HN!