how to handle nulls in date coulmn in teradata -

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this sql , want handle nulls date coulmn .

sql:

insert r_intraday_netrev       ( report_time, snapshot_time, prodtype, qty, yestasp,         m2_cumpct, m2_predictedunits, m2_rev, m3_cumpct, m3_predictedunits, m3_rev) select current_time report_time,         **max(ss_sb1.snapshot_time),**------want handle nulls date coulmn          'ztotal',         null,         null,         null,         null,         sum(round( ( (ss_sb1.qty / ss_p2.cumpct) * ss_sb2.asp ) , 0)),         null,         null,         sum(round( ( (ss_sb1.qty / ss_p3.cumpct) * ss_sb2.asp) , 0))  dw_core.ss_topline_a_v  ss_sb1 left outer join dw_core.ss_topline_rsst_b_v ss_sb2 on ss_sb1.prodtype = ss_sb2.prodtype  left outer join dw_core.ss_predict_p2_v  ss_p2 on  (ss_sb1.prodtype = ss_p2.prodtype , td_day_of_week(ss_sb1.snapshot_time) = ss_p2.dayofweek  , substr(to_char(ss_sb1.snapshot_time, 'hh24mi' ),1,3)||'0' =  ss_p2.timeofday) left outer join dw_core.ss_predict_p3_v  ss_p3 on  (ss_sb1.prodtype = ss_p3.prodtype , (snapshot_time - interval '364' day) = ss_p3.lastyear_date  , substr(to_char(snapshot_time, 'hh24mi' ),1,3)||'0' =  ss_p3.lastyear_time) ;

can please me ...

you can use below check nulls in date:

coalesce((cast(datecolumn varchar2(10))),'')<>'' '


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