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nirnir2
Starting Member
20 Posts |
 Posted - 2015-03-16 : 04:21:02
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| I have the following table .DECLARE @TBL_TEST TABLE (RECID INT,dateStart datetime , dateEnd datetime, prevRecid int , nextRecid int, xkey char(20) )INSERT INTO @TBL_TEST VALUES (11,'20140301','20150228',null,null,'key123')INSERT INTO @TBL_TEST VALUES (22,'20130301','20140228',null,null,'key123')INSERT INTO @TBL_TEST VALUES (33,'20120301','20130228',null,null,'key123')INSERT INTO @TBL_TEST VALUES (44,'20140301','20150228',null,null,'key124')INSERT INTO @TBL_TEST VALUES (55,'20130301','20140228',null,null,'key124')INSERT INTO @TBL_TEST VALUES (66,'20120301','20130228',null,null,'key124')INSERT INTO @TBL_TEST VALUES (77,'20120301','20130228',null,null,'key125')I need to update the fields nextRecid , prevRecid . nextRecid with the recid of record which have same xkey and its dateStart is one day after dateEnd of original record .prevRecid with the recid of record which have same xkey and its dateEnd is one day before dateStart of original record .after the update the data should looks like RECID DateStart DateEnd PrevRecid NextRecid Xkey11 2014-03-01 2015-02-28 22 NULL key123 22 2013-03-01 2014-02-28 33 11 key123 33 2012-03-01 2013-02-28 NULL 22 key123 44 2014-03-01 2015-02-28 55 NULL key124 55 2013-03-01 2014-02-28 66 44 key124 66 2012-03-01 2013-02-28 NULL 55 key124 77 2012-03-01 2013-02-28 NULL NULL key125 |
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gbritton
Master Smack Fu Yak Hacker
2780 Posts |
Posted - 2015-03-16 : 08:54:28
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| This is obviously a homework question. That means you need to make an effort to solve it yourself. Post your work as you go along and call out for help if you get stuck. |
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nirnir2
Starting Member
20 Posts |
Posted - 2015-03-16 : 10:39:12
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| with cte as(select f.recid,s.recid as nextRecid from @TBL_TEST f inner join @TBL_TEST s on f.xkey = s.xkey and DATEDIFF(day,s.dateStart,f.dateEnd ) BETWEEN -3 AND 3)update @TBL_TEST set nextRecid=cte.nextRecid from cte inner join @TBL_TEST t on cte.RECID =t.RECID with cte as(select f.recid,s.recid as prevRecid from @TBL_TEST f inner join @TBL_TEST s on f.xkey = s.xkey and DATEDIFF(day,f.dateStart,s.dateEnd ) BETWEEN -3 AND 3)update @TBL_TEST set prevRecid=cte.prevRecid from cte inner join @TBL_TEST t on cte.RECID =t.RECID select * from @TBL_TEST |
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gbritton
Master Smack Fu Yak Hacker
2780 Posts |
Posted - 2015-03-16 : 13:39:25
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| As far as I can see, the queries you developed generate the output you desire! Good work!! |
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calculate linked records