With regular ISO window functions, one could typically write something along
these lines:
with
DataSet
as
(
select foo.*,
lag( 0, 1, 1 ) over ( partition by id order by time ) as is_lag
from foo
)
select *
from DataSet
where DataSet.is_lag = 1
you're right. it was my fault and teradata is not guilty at all - they
still allow to write it easier than standard:
select * from tab qualify row_number() over(partition by id order by
mtime) = 1
or if you prefer:
select * from tab qualify lag(0, 1, 1) over(partition by id order by
mtime) = 1
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