postgresql-15-first-last-agg - 0.1.4-4-gd63ea3b-6+b1 main

first-last-agg is a simple extension providing two aggregate functions, last
and first, operating on any element type and returning the last or the first
value of the group.
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Since by default the ordering inside groups created by a GROUP BY expression
is not defined, it is advisable to use an ORDER BY clause inside the aggregate
expression (see the aggregate function syntax).