sql - Teradata Week Number Prior Year with Monday as Start of Week -

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i have following statement in teradata

case when extract(year current_date) - 1 = extract(year event_date)     , weeknumber_of_year(event_date) = weeknumber_of_year(current_date) 'y' else 'n' end "wtd_ly"

the issue 'week' supposed start on monday, instead of sunday. how need tweak this?

there's optional parameter week number_of_year:

weeknumber_of_year(current_date, 'iso')

but logic fail, e.g. there's week 53 in 2015/16, not in 2014.


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