环境:clickhouse
需求:一个会员号,按时间排序,会员等级是连续的咋打上同样的标记
环境:clickhouse
需求:一个会员号,按时间排序,会员等级是连续的咋打上同样的标记
直接用窗口函数,标记打上1,2,3这样:
select t.*, rank() over w as flag form test t
WINDOW w AS (partition by department ORDER BY mer_no, date)
SETTINGS allow_experimental_window_functions = 1