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Jack Douglas 
Have you come across a db<>fiddle that is unusually interesting or educational? If so please share it here.
Top Answer
Community 
Tic-tac-toe

<>https://dbfiddle.uk/?rdbms=postgres_11&fiddle=71940aadda50f55bfede87606cd1dc2c
Answer #2
Community 
Postgres operators

<>https://dbfiddle.uk/?rdbms=postgres_12&fiddle=10153af79896d3b9ba14190bec1fbd65
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