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testdb=# select x,y,z from (values ('abc', 'def', 'ghi')) as f(x,y,z); x | y | z -----+-----+----- abc | def | ghi (1 row)
testdb=# select (x,y,z) from (values ('abc', 'def', 'ghi')) as f(x,y,z +); row ... ---------- t (1 row)