At 02:00 PM 10/27/05, Abhishek wrote:
I have a table "TABLE1" which has
----------------------------------------------------
Callguid | digits | type
----------------------------------------------------
xxxx 123 'a'
xxxx 345 'b'
xxxx 678 'c'
type can have only 'a', 'b' or 'c' as its value.
I am tryng to write a query which returns me a record like this
-------------------------------------------------------------------------------------------------------
CallGuid | a type digits | b type digits | c
type digits
-------------------------------------------------------------------------------------------------------
xxxx 123 345
678
1) You didn't say if 'a','b','c' records always exist for every callguid.
2) You didn't say if there is more than one record for a given callguid/type.
If (1) is 'yes' and (2) is 'no'
select a.callguid, a.digits as a_digits, b.digits as b_digits, c.digits as
c_digits
from
(select callguid,digits from table1 where type='a') as a
join
(select callguid,digits from table1 where type='b') as b on
a.callguid=b.callguid
join
(select callguid,digits from table1 where type='c') as c on
a.callguid=c.callguid;
If (1) is 'no' and (2) is 'no'
select coalesce(a.callguid,b.callguid,c.callguid) as callguid,
a.digits as a_digits, b.digits as b_digits, c.digits as c_digits
from
(select callguid,digits from table1 where type='a') as a
full outer join
(select callguid,digits from table1 where type='b') as b on
a.callguid=b.callguid
full outer join
(select callguid,digits from table1 where type='c') as c on
a.callguid=c.callguid;
If (2) is 'yes', you're on your own. You can also try searching for
"crosstab" and/or "pivot table" for more info.
---------------------------(end of broadcast)---------------------------
TIP 4: Have you searched our list archives?
http://archives.postgresql.org
