jrspano
asked on
big sql self join
I have a table i need to join on itself.
the table def:
DivisionId,AssemblyNumber, SequenceNu mber,Compo nentPartNu mber,ShipI tem
all are varchar except shipitem which is a bit
basically assembly number is a partnumber and component partnumbers are partnumbers. you add component parts under assemblynumbers
ex
assemblynumber:1
sequencenumber:1
compententpart:A
shipitem: 0
assemblynumber:1
sequencenumber:2
compententpart:B
shipitem: 0
assemblynumber:1
sequencenumber:3
compententpart:C
shipitem: 0
etc... you can also have assemblies under assemblies
assemblynumber:2
sequencenumber:1
compententpart:A
shipitem: 0
assemblynumber:2
sequencenumber:2
compententpart:1 'this the the assemble above
shipitem: 0
now your assembly 2 has a part a and a part 1 that happens to be an assembly composed of other parts. I need a self join that will give me the records that have a ship item of 1 that starts with the main assembly and then gets all below it. the layers could go very deep also. ex you have assembly 1 which as assembly 2 which has assembly 3 and 4 which then have more etc. if possible i would also need it to stop on the main assemblies if they are ship items. ex assembly 1 as a part a under it and assembly 2 under it. assembly 2 is marked as a shipitem. it also has parts under it, but i don't care since it is marked already. any ideas?
the table def:
DivisionId,AssemblyNumber,
all are varchar except shipitem which is a bit
basically assembly number is a partnumber and component partnumbers are partnumbers. you add component parts under assemblynumbers
ex
assemblynumber:1
sequencenumber:1
compententpart:A
shipitem: 0
assemblynumber:1
sequencenumber:2
compententpart:B
shipitem: 0
assemblynumber:1
sequencenumber:3
compententpart:C
shipitem: 0
etc... you can also have assemblies under assemblies
assemblynumber:2
sequencenumber:1
compententpart:A
shipitem: 0
assemblynumber:2
sequencenumber:2
compententpart:1 'this the the assemble above
shipitem: 0
now your assembly 2 has a part a and a part 1 that happens to be an assembly composed of other parts. I need a self join that will give me the records that have a ship item of 1 that starts with the main assembly and then gets all below it. the layers could go very deep also. ex you have assembly 1 which as assembly 2 which has assembly 3 and 4 which then have more etc. if possible i would also need it to stop on the main assemblies if they are ship items. ex assembly 1 as a part a under it and assembly 2 under it. assembly 2 is marked as a shipitem. it also has parts under it, but i don't care since it is marked already. any ideas?
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ASKER
is there any way to do it with out a temp table, with joins or something like that?
Unfortunately, SQL Server does not give you this option, while ORACLE does :-(
Only if you want to limit the number of levels - you basically need one join per level.
ASKER
ok thanks i'll use the temp table idea here is the code from the other post if someone else should buy this question they can see it
by nigelrivett:
Your relationship structure should be maintained by a table with
parent child
so you would have
0 01
0 02
0 03
0 04
01 011
01 012
For this structure a query that will get the entire structure is (for sql server - can be adapted for
others).
From an answer I have given previously. You can adapt this to give your solution.
General way to handle trees. Fails when the squence varchar length is exceeded - in this case 100 levels.
Problems for more than 800.
create table #z (id int, name varchar(20), threadID int null)
insert #z select 1, 'foo', null
insert #z select 2, 'foo2', null
insert #z select 3, 'foo2a', 2
insert #z select 4, 'foo2b', 2
insert #z select 5, 'foo3', null
insert #z select 6, 'foo3b', 5
insert #z select 7, 'foo3ba', 6
insert #z select 8, 'foo4', null
insert #z select 9, 'fooa', 1
insert #z select 10, 'foo2ba', 4
drop table #a
go
create table #a (id int, sequence varchar(1000), levelNo int)
insert #a select id, right(space(10) + convert(varchar(10),id),10 ), 1 from #z where threadid is null
declare @i int
select @i = 0
while @@rowcount > 0
begin
select @i = @i + 1
insert #a
select #z.id, sequence + right(space(10) + convert(varchar(10),#z.id) ,10), @i + 1
from #z, #a
where #a.levelNo = @i
and #z.threadID = #a.id
end
select #z.name
from #a, #z
where #a.id = #z.id
order by sequence
by nigelrivett:
Your relationship structure should be maintained by a table with
parent child
so you would have
0 01
0 02
0 03
0 04
01 011
01 012
For this structure a query that will get the entire structure is (for sql server - can be adapted for
others).
From an answer I have given previously. You can adapt this to give your solution.
General way to handle trees. Fails when the squence varchar length is exceeded - in this case 100 levels.
Problems for more than 800.
create table #z (id int, name varchar(20), threadID int null)
insert #z select 1, 'foo', null
insert #z select 2, 'foo2', null
insert #z select 3, 'foo2a', 2
insert #z select 4, 'foo2b', 2
insert #z select 5, 'foo3', null
insert #z select 6, 'foo3b', 5
insert #z select 7, 'foo3ba', 6
insert #z select 8, 'foo4', null
insert #z select 9, 'fooa', 1
insert #z select 10, 'foo2ba', 4
drop table #a
go
create table #a (id int, sequence varchar(1000), levelNo int)
insert #a select id, right(space(10) + convert(varchar(10),id),10
declare @i int
select @i = 0
while @@rowcount > 0
begin
select @i = @i + 1
insert #a
select #z.id, sequence + right(space(10) + convert(varchar(10),#z.id)
from #z, #a
where #a.levelNo = @i
and #z.threadID = #a.id
end
select #z.name
from #a, #z
where #a.id = #z.id
order by sequence