SQL pivot-like records arrangement

Question

I have following table which carries records.

ID header      value
1  firstname   James
1  lastname    Tulan
2  firstname   Berty
2  lastname    O-Nelly
3  firstname   Ana
3  lastname    Santos

I need to display the records as follows

id firstname    Lastname
1  James        Tulan
2  Berty        O-Nelly
3  Ana          Santos

I tried to use SQL PIVOT function. It didn't work properly. Anyone encountered the same?

Answer 1

Assuming the ids in the first table do identify the pairs, you can just do aggregation:

select id,
       max(case when header = 'firstname' then value end) as firstname,
       max(case when header = 'lastname' then value end) as lastname
from t
group by id;