Wouldn't it be cool if someday psql could do value completion?
# delete from person where lastname = 'Garam<tab>
# delete from person where lastname = 'Garamond' _
# delete from person where firstname = 'Da<tab><tab>
# delete from person where firstname = 'Da
Damian Darren Dave David Dawson
# delete from person where firstname = 'D<tab><tab>
Display all 215 possibilities? (y or n)
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dave