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By using db<>fiddle, you agree to license everything you submit by Creative Commons CC0. 1130735 fiddles created (16587 in the last week).

select round(power(2::numeric,63::numeric)) "2^63" ,round(power(2::numeric,64::numeric)) "2^64" ,(9223372036854775808::numeric-9223372036854775809::numeric)::bigint "offset low val" ,(18446744073709551616::numeric-9223372036854775809::numeric)::bigint "offset high val";
2^63 2^64 offset low val offset high val
9223372036854775808 18446744073709551616 -1 9223372036854775807
 hidden batch(es)