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SELECT string_agg(foo, ';') WITHIN GROUP ( ORDER BY foo) as polaczone_literki FROM --tutaj powinna byc nazwa twojej tabelki a ponizej juz nic nie powinno być (VALUES ('A') , ('Z') , ('B') , ('C') , ('D') , ('E') ) dane_z_dupy (foo)
polaczone_literki
A;B;C;D;E;Z