lag and lead functions in SQL || Basic series скачать в хорошем качестве

lag and lead functions in SQL || Basic series

lead and lag are dynamic sql functions which pull subsequent and previous row values based on the partition expression and order by expressions given. Syntax: LEAD(column,lag_value) OVER (PARTITION BY partition_expression ORDER BY sort_expression) LAG(column,lag_value) OVER (PARTITION BY partition_expression ORDER BY sort_expression) Final query used in the video: select *, lead(rev,1) over (order by year,qrtr) as rev_next_qrtr from rev; select *, lag(rev,1) over (order by year,qrtr) as rev_previous_qrtr from rev; different channels: *************coming soon*********************** *************blog links coming soon*****************