How to get a count of unique records

How do you get a count of unique records? Looking only for one number, not a list..so if the data is:
ID
===
1234
1234
1234
1236
1236
1237
Then, the count total will be one field called 'ID' with the value '3' in it..
All I know how to do is get a count that will count all records, or do it in two queries. Looking to do this in one query statment..
Thanks..

Just a small clarification...
Concatenation could potentially give wrong result, depending on the data.
For example...
sudhakar@ORCL>ed
Wrote file afiedt.buf
1 with t1 as
2 (select 'AA' c1, '101' c2 from dual union
3 select 'AA1' c1, '01' c2 from dual union
4 select 'AA101' c1, null c2 from dual union
5 select 'BB2' c1, '345' c2 from dual union
6 select 'AA101' c1, null c2 from dual union
7 select 'BB2' c1, '345' c2 from dual union
8 select 'BB234' c1, '5' c2 from dual
9 )
10* select count(distinct c1 || c2) from t1
sudhakar@ORCL>/
2IMHO, the required answer will be...
sudhakar@ORCL>ed
Wrote file afiedt.buf
1 with t1 as
2 (select 'AA' c1, '101' c2 from dual union
3 select 'AA1' c1, '01' c2 from dual union
4 select 'AA101' c1, null c2 from dual union
5 select 'BB2' c1, '345' c2 from dual union
6 select 'AA101' c1, null c2 from dual union
7 select 'BB2' c1, '345' c2 from dual union
8 select 'BB234' c1, '5' c2 from dual
9 )
10* select count(distinct c1 ||'.'|| c2) from t1
sudhakar@ORCL>/
5
sudhakar@ORCL>vr,
Sudhakar B.

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Message was edited by:
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