17 lines
469 B
SQL
17 lines
469 B
SQL
create or replace function ems.fn_deye_clock_drift_sec(
|
|
p_device_ts timestamptz,
|
|
p_reference_ts timestamptz
|
|
)
|
|
returns int
|
|
language sql
|
|
immutable
|
|
as $fn$
|
|
select case
|
|
when p_device_ts is null or p_reference_ts is null then null::int
|
|
else abs(extract(epoch from (p_device_ts - p_reference_ts)))::int
|
|
end;
|
|
$fn$;
|
|
|
|
comment on function ems.fn_deye_clock_drift_sec(timestamptz, timestamptz) is
|
|
'Absolutní odchylka hodin Deye vs referenční UTC (sekundy).';
|