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0 sats \ 0 replies \ @BitcoinHandsOn OP 4 Aug \ parent \ on: Open sourcing my book Bitcoin Hands-On bitcoin
They can, sometimes. I made decent money on this one:
SQL Practice Problems: 57 beginning, intermediate, and advanced challenges for you to solve using a “learn-by-doing” approach.
(You may notice a certain similarity in subtitle to my bitcoin book (https://www.amazon.com/dp/B0F4SZSCH8)
But you're right, most of the time they don't.