teradata simple sql

how do I do the following in teradata:
select * from table
where ship_date between (1st day of previous month) and (last_day of previous month)
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select * from table
where month(ship_date) = Month(current date - 1 month)
 and year(ship_date) = Year(current date - 1 month)
or try this...

select *
from ...
ship_date between add_months(current_date,-1) - extract(day from Add_months(current_date,-1)) + 1
  and add_months(add_months(current_date,-1) - extract(day from Add_months(current_date,-1)) + 1,1) - 1

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Sara_j_11Author Commented:
does both of the above posts do the same thing? is there any disadvantage of using post 1?
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