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Maybe not remove it but perhaps have a choice of SQL 'flavor'.

That would be very useful, aka user chooses Oracle, MySQL, MS-SQL, etc.

Hey Eugene! In the last question, it seems you can get the same result by doing top 3, or limit 3, but only limit 3 is accepted as valid. You might either want to, if there's a valid reason for the distinction (execution order?), want to highlight as the difference between top and limit, or if there isn't, accept both.

thanks for the suggestion! yes, definitely will need to update the way it checks for correct answer as there can be multiple variations.

Nice! Would love to see this, but for complex queries.

Make sure it's virtualized/sandboxed, SQL basically guarantees HDD write access.