Count Distinct Over Partition Syntax Error

Question

Count(Distinct [field]) over (partition by [field2]) returns a syntax error at the key word distinct
Count(all [field]) over (partition by [field2]) compiles fine
I am writing a query to count the number of clients a sales rep has when the sales rep represents multiple companies (ad agency).  I need a count of the clients each company has and a distinct count that each rep has.  A client may be assigned to multiple companies.
Is a distinct count supported with partitions?

Answer 1

Until we wait for the full implementation of the OVER clause, you can
try something like this:
CREATE TABLE Foo (
fookey INT PRIMARY KEY,
company VARCHAR(30),
sales_rep VARCHAR(30),
client VARCHAR(30));
INSERT INTO Foo VALUES(1, 'ABC Corp.', 'Joe', 'Client1');
INSERT INTO Foo VALUES(2, 'ABC Corp.', 'Joe', 'Client2');
INSERT INTO Foo VALUES(3, 'ABC Corp.', 'Peter', 'Client2');
INSERT INTO Foo VALUES(4, 'DEF Corp.', 'Joe', 'Client1');
INSERT INTO Foo VALUES(5, 'DEF Corp.', 'Joe', 'Client3');
SELECT fookey, company, sales_rep, client,
MAX(rk1) OVER(PARTITION BY sales_rep) AS rep_distinct_client_cnt,
MAX(rk2) OVER(PARTITION BY company) AS company_distinct_client_cnt
FROM (
SELECT fookey, company, sales_rep, client,
DENSE_RANK() OVER(PARTITION BY sales_rep ORDER BY client) As rk1,
DENSE_RANK() OVER(PARTITION BY company ORDER BY client) As rk2
FROM Foo) AS F;
fookey company sales_rep client rep_distinct_client_cnt
company_distinct_client_cnt
1 ABC Corp. Joe Client1 3 2
2 ABC Corp. Joe Client2 3 2
3 ABC Corp. Peter Client2 1 2
4 DEF Corp. Joe Client1 3 2
5 DEF Corp. Joe Client3 3 2
Plamen Ratchev
http://www.SQLStudio.com