Question

You, for some reason, want a combined list of all surnames and all facility names. Yes, this is a contrived example :-). Produce that list!
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DB schema

Expected Results

surname
Tennis Court 2
Worthington-Smyth
Badminton Court
Pinker
Dare
Bader
Mackenzie
Crumpet
Massage Room 1
Squash Court
Tracy
Hunt
Tupperware
Smith
Butters
Rownam
Baker
Genting
Purview
Coplin
Massage Room 2
Joplette
Stibbons
Rumney
Pool Table
Sarwin
Boothe
Farrell
Tennis Court 1
Snooker Table
Owen
Table Tennis
GUEST
Jones

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Answers and Discussion Show

select surname 
	from cd.members
union
select name
	from cd.facilities;          

The UNION operator does what you might expect: combines the results of two SQL queries into a single table. The caveat is that both results from the two queries must have the same number of columns and compatible data types.

UNION removes duplicate rows, while UNION ALL does not. Use UNION ALL by default, unless you care about duplicate results.

Look up the SQL keyword UNION

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