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SQL server creating a query

Posted on 2008-10-29
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Last Modified: 2012-05-05
Hi im offering maximum points to who ever can help me
I am creating a database which contains a table structure, this structure table has four different levels within it.

For example level 4 has a parent code that relates to level 3 which level 3 parent code is related to level 2 and the level 2 parent code is related to level 1

i am tryin to create a veiw in sql server that will show all records

so say someone is on level four then it will go to all the levels,, where as a person maybe just relate to level 3 or 2 or 1 but it wont recognise it as the veiw only shows from level four downwards

i have attached a file to show you

as i sed it only shows from level four but i want to show all the levels down the side for referencing

for example if there goin from level 2 then it will show show level 2 and level 1

and if from level 1 it will only show level 1

etc etc

Please help me


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Question by:LukeConey
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7 Comments
 
LVL 39

Expert Comment

by:BrandonGalderisi
ID: 22832417
You don't need 4 tables to store 4 levels.

Below is an example of a single table that uses CTE's to handle your recursive parent/child data.
create table #Levels
 (LevelID        int identity not null
 ,ParentLevelID  int null
 ,code           varchar(32)
 ,sequence_code  varchar(255)
 )
go
 
insert into #Levels (ParentLevelID,code,sequence_code) values(null, '000001','0000')
insert into #Levels (ParentLevelID,code,sequence_code) values(1, '000002','0000')
insert into #Levels (ParentLevelID,code,sequence_code) values(2, '000003','0000')
insert into #Levels (ParentLevelID,code,sequence_code) values(3, '000004','0000')
insert into #Levels (ParentLevelID,code,sequence_code) values(null, '100001','0001')
insert into #Levels (ParentLevelID,code,sequence_code) values(5, '100002','0001')
insert into #Levels (ParentLevelID,code,sequence_code) values(6, '100003','0001')
insert into #Levels (ParentLevelID,code,sequence_code) values(7, '100004','0001')
 
go
select * from #Levels
 
;with AllLevels as
(select levelid,parentlevelid,1 as theLevel from #Levels
where parentLevelID is null
union all
select l.levelid,l.parentlevelid,al.theLevel+1 from #Levels l
join AllLevels al
on l.parentlevelid = al.levelid)
select * from alllevels al
join #Levels l
on al.levelID = l.LevelID
go
drop table #Levels

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Author Comment

by:LukeConey
ID: 22832477
yeah i understand what you are sayin

i already have them as one table but i want to show how they work down twoards level 1

not just all in one column if you understand that

i created veiws so that it would select all levels and show how they work from 4 to 1 but i want to also show if someone just buys a kitchen they are level 1 and i want it to show the 4 levels which will stay at 1 whereas from 4 i will show 4 levels but it will work down to 1

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LVL 39

Accepted Solution

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BrandonGalderisi earned 500 total points
ID: 22832617
OK.  I'm still not sure what you are attempting to display, but does this help you display the data in a format closer to what you want?
create table #Levels
 (LevelID        int identity not null
 ,ParentLevelID  int null
 ,code           varchar(32)
 ,sequence_code  varchar(255)
 )
go
 
insert into #Levels (ParentLevelID,code,sequence_code) values(null, '000001','0000')
insert into #Levels (ParentLevelID,code,sequence_code) values(1, '000002','0000')
insert into #Levels (ParentLevelID,code,sequence_code) values(2, '000003','0000')
insert into #Levels (ParentLevelID,code,sequence_code) values(3, '000004','0000')
insert into #Levels (ParentLevelID,code,sequence_code) values(null, '100001','0001')
insert into #Levels (ParentLevelID,code,sequence_code) values(5, '100002','0001')
insert into #Levels (ParentLevelID,code,sequence_code) values(6, '100003','0001')
insert into #Levels (ParentLevelID,code,sequence_code) values(7, '100004','0001')
 
go
select * from #Levels
 
;with AllLevels as
(select levelid as rootLevel,levelid,parentlevelid,1 as theLevel,cast(Code as nvarchar(max)) code,cast(sequence_code as nvarchar(max)) sequence_code from #Levels
where parentLevelID is null
union all
select al.rootLevel,l.levelid,l.parentlevelid,al.theLevel+1,al.code + '/' + l.Code,al.sequence_code + '/' + l.sequence_code from #Levels l
join AllLevels al
on l.parentlevelid = al.levelid)
select * from alllevels al
join #Levels l
on al.levelID = l.LevelID
go
drop table #Levels

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Author Comment

by:LukeConey
ID: 22832947
its not workin
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LVL 39

Expert Comment

by:BrandonGalderisi
ID: 22832966
The query that I posted isn't working?  It works for me.  I know that's a typical excuse, but I copied out what I posted and ran it, it works.  

What's it doing/not doing?


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LVL 39

Expert Comment

by:BrandonGalderisi
ID: 23395478
This question has been open for 3 months now.  You didn't post anything about what ISN'T working so I think it's fair to assume it IS working.  Can you close this up!

Thanks.
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