Parent child relationship Join tables in oracle sql












0















I have a requirement below.



Table Structure containing Position details



Now I have to get output like below



enter image description here



How can this be achieved ?
I have written the below SQL but parent_position_id is coming, not parent_position_code



select

hapf.position_code,

pphf.parent_position_id

from

hr_all_positions_f hapf, PER_POSITION_HIERARCHY_F pphf

where

hapf.position_id = pphf.position_id


Should I write a sub query? How should I proceed ?
This is Oracle SQL



Thanks,
Shivam






sql oracle join oracle11g







share|improve this question























  • Hint: JOIN. And JOIN again.

    – Gordon Linoff
    Nov 26 '18 at 13:46











  • Can you please tell me how these joins would work ?

    – shivam
    Nov 26 '18 at 13:58











  • I got it, I used this SQL query as a table to join in another query. I think this is correct

    – shivam
    Nov 26 '18 at 14:04
















0















I have a requirement below.



Table Structure containing Position details



Now I have to get output like below



enter image description here



How can this be achieved ?
I have written the below SQL but parent_position_id is coming, not parent_position_code



select

hapf.position_code,

pphf.parent_position_id

from

hr_all_positions_f hapf, PER_POSITION_HIERARCHY_F pphf

where

hapf.position_id = pphf.position_id


Should I write a sub query? How should I proceed ?
This is Oracle SQL



Thanks,
Shivam






sql oracle join oracle11g







share|improve this question























  • Hint: JOIN. And JOIN again.

    – Gordon Linoff
    Nov 26 '18 at 13:46











  • Can you please tell me how these joins would work ?

    – shivam
    Nov 26 '18 at 13:58











  • I got it, I used this SQL query as a table to join in another query. I think this is correct

    – shivam
    Nov 26 '18 at 14:04














0












0








0








I have a requirement below.



Table Structure containing Position details



Now I have to get output like below



enter image description here



How can this be achieved ?
I have written the below SQL but parent_position_id is coming, not parent_position_code



select

hapf.position_code,

pphf.parent_position_id

from

hr_all_positions_f hapf, PER_POSITION_HIERARCHY_F pphf

where

hapf.position_id = pphf.position_id


Should I write a sub query? How should I proceed ?
This is Oracle SQL



Thanks,
Shivam






sql oracle join oracle11g







share|improve this question














I have a requirement below.



Table Structure containing Position details



Now I have to get output like below



enter image description here



How can this be achieved ?
I have written the below SQL but parent_position_id is coming, not parent_position_code



select

hapf.position_code,

pphf.parent_position_id

from

hr_all_positions_f hapf, PER_POSITION_HIERARCHY_F pphf

where

hapf.position_id = pphf.position_id


Should I write a sub query? How should I proceed ?
This is Oracle SQL



Thanks,
Shivam






sql oracle join oracle11g




sql oracle join oracle11g






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked Nov 26 '18 at 13:24









shivamshivam

133418




133418













  • Hint: JOIN. And JOIN again.

    – Gordon Linoff
    Nov 26 '18 at 13:46











  • Can you please tell me how these joins would work ?

    – shivam
    Nov 26 '18 at 13:58











  • I got it, I used this SQL query as a table to join in another query. I think this is correct

    – shivam
    Nov 26 '18 at 14:04



















  • Hint: JOIN. And JOIN again.

    – Gordon Linoff
    Nov 26 '18 at 13:46











  • Can you please tell me how these joins would work ?

    – shivam
    Nov 26 '18 at 13:58











  • I got it, I used this SQL query as a table to join in another query. I think this is correct

    – shivam
    Nov 26 '18 at 14:04

















Hint: JOIN. And JOIN again.

– Gordon Linoff
Nov 26 '18 at 13:46





Hint: JOIN. And JOIN again.

– Gordon Linoff
Nov 26 '18 at 13:46













Can you please tell me how these joins would work ?

– shivam
Nov 26 '18 at 13:58





Can you please tell me how these joins would work ?

– shivam
Nov 26 '18 at 13:58













I got it, I used this SQL query as a table to join in another query. I think this is correct

– shivam
Nov 26 '18 at 14:04





I got it, I used this SQL query as a table to join in another query. I think this is correct

– shivam
Nov 26 '18 at 14:04












1 Answer
1






active

oldest

votes


















2














Noone ever said you could only join a table in once:



select

  chi.position_code,

  par.position_code as parent_position_code

from

  hr_all_positions_f hapf

  INNER JOIN PER_POSITION_HIERARCHY_F chi on hapf.position_id = chi.position_id

  INNER JOIN PER_POSITION_HIERARCHY_F par on hapf.parent_position_id = par.position_id


Bear it in mind; I see people coming to thinking all the time that they can only join a table once. If one table decodes a value in 3 different columns, then you sure can join that same table in 3 times... Imagine if it were an address table, and a Student had a HomeAddressId, WorkAddressId and StudyAddressId, and the Address table held all these addresses - you'd join the addresses table to the Student table 3 times to get all the data..






share|improve this answer
























  • Thanks for detailed reply, this is a easy way to do it than I was doing it.

    – shivam
    Nov 26 '18 at 14:24











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1 Answer
1






active

oldest

votes








1 Answer
1






active

oldest

votes









active

oldest

votes






active

oldest

votes









2














Noone ever said you could only join a table in once:



select

  chi.position_code,

  par.position_code as parent_position_code

from

  hr_all_positions_f hapf

  INNER JOIN PER_POSITION_HIERARCHY_F chi on hapf.position_id = chi.position_id

  INNER JOIN PER_POSITION_HIERARCHY_F par on hapf.parent_position_id = par.position_id


Bear it in mind; I see people coming to thinking all the time that they can only join a table once. If one table decodes a value in 3 different columns, then you sure can join that same table in 3 times... Imagine if it were an address table, and a Student had a HomeAddressId, WorkAddressId and StudyAddressId, and the Address table held all these addresses - you'd join the addresses table to the Student table 3 times to get all the data..






share|improve this answer
























  • Thanks for detailed reply, this is a easy way to do it than I was doing it.

    – shivam
    Nov 26 '18 at 14:24
















2














Noone ever said you could only join a table in once:



select

  chi.position_code,

  par.position_code as parent_position_code

from

  hr_all_positions_f hapf

  INNER JOIN PER_POSITION_HIERARCHY_F chi on hapf.position_id = chi.position_id

  INNER JOIN PER_POSITION_HIERARCHY_F par on hapf.parent_position_id = par.position_id


Bear it in mind; I see people coming to thinking all the time that they can only join a table once. If one table decodes a value in 3 different columns, then you sure can join that same table in 3 times... Imagine if it were an address table, and a Student had a HomeAddressId, WorkAddressId and StudyAddressId, and the Address table held all these addresses - you'd join the addresses table to the Student table 3 times to get all the data..






share|improve this answer
























  • Thanks for detailed reply, this is a easy way to do it than I was doing it.

    – shivam
    Nov 26 '18 at 14:24














2












2








2







Noone ever said you could only join a table in once:



select

  chi.position_code,

  par.position_code as parent_position_code

from

  hr_all_positions_f hapf

  INNER JOIN PER_POSITION_HIERARCHY_F chi on hapf.position_id = chi.position_id

  INNER JOIN PER_POSITION_HIERARCHY_F par on hapf.parent_position_id = par.position_id


Bear it in mind; I see people coming to thinking all the time that they can only join a table once. If one table decodes a value in 3 different columns, then you sure can join that same table in 3 times... Imagine if it were an address table, and a Student had a HomeAddressId, WorkAddressId and StudyAddressId, and the Address table held all these addresses - you'd join the addresses table to the Student table 3 times to get all the data..






share|improve this answer













Noone ever said you could only join a table in once:



select

  chi.position_code,

  par.position_code as parent_position_code

from

  hr_all_positions_f hapf

  INNER JOIN PER_POSITION_HIERARCHY_F chi on hapf.position_id = chi.position_id

  INNER JOIN PER_POSITION_HIERARCHY_F par on hapf.parent_position_id = par.position_id


Bear it in mind; I see people coming to thinking all the time that they can only join a table once. If one table decodes a value in 3 different columns, then you sure can join that same table in 3 times... Imagine if it were an address table, and a Student had a HomeAddressId, WorkAddressId and StudyAddressId, and the Address table held all these addresses - you'd join the addresses table to the Student table 3 times to get all the data..







share|improve this answer












share|improve this answer



share|improve this answer










answered Nov 26 '18 at 14:04









Caius JardCaius Jard

11.8k21239




11.8k21239













  • Thanks for detailed reply, this is a easy way to do it than I was doing it.

    – shivam
    Nov 26 '18 at 14:24



















  • Thanks for detailed reply, this is a easy way to do it than I was doing it.

    – shivam
    Nov 26 '18 at 14:24

















Thanks for detailed reply, this is a easy way to do it than I was doing it.

– shivam
Nov 26 '18 at 14:24





Thanks for detailed reply, this is a easy way to do it than I was doing it.

– shivam
Nov 26 '18 at 14:24




















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