How to create multiple rows from single row

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How to create multiple rows from single row

Author

Topic

Niki
Yak Posting Veteran

51 Posts

Posted - 2013-03-05 : 18:57:14

I have table A with StuID and table B with Stuid & multiple Enter & leavedates. I want to create multiple rows for each enter and leavedate.

Table A
StuID 99999

Table B
Stuid 99999 edate ldate edate1 ldate1 edate2 ldate2

Result should look like

99999 edate ldate
99999 edate1 ldate1
99999 edate2 ldate2

How can I do that? I tried CROSS APPLY but I don't think I am using it correctly. Please help.

Niki

Lamprey
Master Smack Fu Yak Hacker

4614 Posts

Posted - 2013-03-05 : 18:59:09

Is each of those dates a column in the table or are they a single concatenated string column?

http://www.sqlservercentral.com/articles/Best+Practices/61537/
http://weblogs.sqlteam.com/brettk/archive/2005/05/25/5276.aspx

Niki
Yak Posting Veteran

51 Posts

Posted - 2013-03-05 : 19:04:00

They are Datetime type. This is how I am doing it and I know there must be a better way to do ot. Please help
select a.studentno, b.schno , edate as Enterdate, ldate as LeaveDate
fromtblA a
inner join tblB b on a.studentno = b.Studentno

union all
select a.studentno, schno2 , edate2 as Enterdate, ldate2 as LeaveDate
fromtblA a
inner join tblB b on a.studentno = b.Studentno

union all
select a.studentno, schno3 , edate3 as Enterdate, ldate3 as LeaveDate
fromtblA a
inner join tblB b on a.studentno = b.Studentno

visakh16
Very Important crosS Applying yaK Herder

52326 Posts

Posted - 2013-03-06 : 01:16:34

[code]
select p.studid,p.val as edateval, q.val as ldateval
from
(
select studid,dates,val,row_number() over (partition by studid order by dates) as seq
from (select studid,edate,edate1,edate2 from table )t
unpivot (val for dates in (edate,edate1,edate2))u
)p
inner join
(
select studid,dates,val,row_number() over (partition by studid order by dates) as seq
from (select studid,ldate,ldate1,ldate2 from table )m
unpivot (val for dates in (ldate,ldate1,ldate2))n
)q
on q.studid=p.studid
and q.seq=p.seq
[/code]

------------------------------------------------------------------------------------------------------
SQL Server MVP
http://visakhm.blogspot.com/

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