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MikeMKH/find_data_changes.sql

Created May 30, 2018 19:14
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SQL example of using lag to find the date that a column changes in a time series data
Raw
find_data_changes.sql
select * from (
select
key_col
,date_col
,data_col
,prev_data_col = lag(data_col, 1) over (partition by key_col order by date_col)
from tbl
) as z
where prev_data_col is not NULL
and data_col <> prev_data_col
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