This advanced SQL exercise is part of the book: Advanced SQL – Practical Techniques and Use-Cases, which includes 100 day-to-day SQL challenges (and solutions), need-to-know advanced features, and key concepts.
 

MyDate, an online dating service, manages a table contains their list of members. As seen here, MyDate has eight members: four men and four women.

CREATE TABLE MatchUp 
 (CandidateGender varchar(25), 
 CandidateID int)    
 GO   

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