sql server - mssql join criteria with the same table -


just need little help. have calendar table here sqlfiddle.com/#!3/5d8a9 there 2 flags (m, w) indicating month or week. need join tbl2 (below) has weekly date field. join tbl2 on weekstartdate cal table on start date (with w flag) need return startdate 'm' flag if weekstartdate falls between start , end date. make sense?

tbl2:  prod_id        weeknum      wkstartdate     postingdate     qty ---------------------------------------------------------------- 1043890         5           2015-01-25      2016-01-18      3 1043890         6           2015-02-01      2016-01-18      6 1043890         7           2015-02-08      2016-01-18      2 1043890         8           2015-02-15      2016-01-18      0 ... 1043890         50          2015-12-06      2016-01-18      1 1043890         51          2015-12-13      2016-01-18      2 1043890         52          2015-12-20      2016-01-18      7   desired result: ==================  prod_id       weeknum      wkstartdate     postingdate     qty   period ---------------------------------------------------------------------------- 1043890         5           2015-01-25      2016-01-18      3    2015-01-25 1043890         6           2015-02-01      2016-01-18      6    2015-01-25 1043890         7           2015-02-08      2016-01-18      2    2015-01-25 1043890         8           2015-02-15      2016-01-18      0    2015-01-25 1043890         10          2015-03-01      2016-01-18      0    2015-03-01 ... 1043890         50          2015-12-06      2016-01-18      1    2015-11-22 1043890         51          2015-12-13      2016-01-18      2    2015-11-22 1043890         52          2015-12-20      2016-01-18      7    2015-11-22

if makes sense, i'm trying check if weekstartdate falls between range of dates (startdate-enddate) flag of m, bring startdate , either update record in temp table or create temp table new column added each record.

thanks.

what understood trying join table2 on weekstarttable cal table on startdate , want modify flag if week start date falls between start date , end date. if got correct, try following query.

select t2.prod_id,t2.weeknum,c.startdate        ,case when t2.wkstartdate between c.startdate , c.enddate         'm' else null end modifiedflag,          c.flag originalflag    cal c,table2 t2   c.flag ='w' , t2.wkstartdate = c.startdate        , t2.wkstartdate between c.startdate , c.enddate;

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