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SQL XML SQL Server 2008 SQL Server mysql query PLSQL Oracle sqlite SQlLiteDatabse

How to return order_no where customers made concurrent bookings?

I have a table on booking orders for trips. Bookings (order_no, user_id, booking_time,cancel_time,complete_time) I try to write a query to return the order_no from all rows where customers made concurrent bookings (i.e. where a customer mad...
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