How to outer-join two tables (main and many-to-one sub-table) to get only ONE item from second table?

I like Charlie's answer best, but i'm not sure if Postges has a TOP/LIMIT function, so here's an alternate solution that doesn't need one (but does assume sub_table has a primary key called "id").

If you're using SQL Server, you can use the TOP clause. If it is something other than SQL Server, you'll have to see if that database offers something equivalent (many of them do). Something like this ...

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