Question

i have an Table called customer with columns like this

 CustomerID  primaryCustID   Phonenumber  Mobilenumber
 1              1               11111       983433453
 2              2               22222       564647844
 3              3               33333       983344354
 4              4               44444       983434232
 5              2               55555       983436790
 6              4               66666       983431111
 7              4               77777       983434444
 8              8               88888       983437777
 9              3               99999       983439999

now i need to get output like this

CustomerID  primaryCustID   Phonenumber1  Mobilenumber1       Phonenumber2      Mobilenumber2
 5              2               55555       983436790           22222           564647844
 6              4               66666       983431111           44444           983434232
 7              4               77777       983434444           44444           983434232
 9              3               99999       983439999           33333           983344354

.

select e.CustomerID, m.primaryCustID ,e.Phonenumber1 "Phonenumber1", 
e.Mobilenumber "Mobilenumber1", m.Phonenumber1 "Phonenumber2",
m.Mobilenumber "Mobilenumber2" from Customer e,
Customer m where e.CustomerID<>m.primaryCustID

i tried like this but not getting excepted result

any idea how to solve this,anyhelp would be great.

Thanks

Prince

Answer 1

You forgot to add the join condition that connects primaryCustID with CustomerID.

select C1.CustomerID,
       C1.primaryCustID,
       C1.Phonenumber as Phonenumber1,
       C1.Mobilenumber as Mobilenumber1,
       C2.Phonenumber as Phonenumber2,
       C2.Mobilenumber as Mobilenumber2
from Customer as C1
  inner join Customer as C2
    on C1.primaryCustID = C2.CustomerID
where C1.CustomerID <> C1.primaryCustID