I have a table with 3 columns containing a variable number of records based off of the first column which is a foreign key. I am trying to determine if I can detect when there is a duplicate across multiple rows for an entire series

declare @finddupseries table
(
    portid  int,
    asset_id int,
    allocation float
)
;
INSERT INTO @finddupseries
SELECT 250, 6, 0.05 UNION ALL
SELECT 250, 66, 0.8 UNION ALL
SELECT 250, 2, 0.105 UNION ALL
SELECT 250, 4, 0.0225 UNION ALL
SELECT 250, 5, 0.0225 UNION ALL
SELECT 251, 13, 0.6 UNION ALL
SELECT 251, 2, 0.3 UNION ALL
SELECT 251, 5, 0.1 UNION ALL
SELECT 252, 13, 0.8 UNION ALL
SELECT 252, 2, 0.15 UNION ALL
SELECT 252, 5, 0.05 UNION ALL
SELECT 253, 13, 0.4 UNION ALL
SELECT 253, 2, 0.45 UNION ALL
SELECT 253, 5, 0.15 UNION ALL
SELECT 254, 6, 0.05 UNION ALL
SELECT 254, 66, 0.8 UNION ALL
SELECT 254, 2, 0.105 UNION ALL
SELECT 254, 4, 0.0225 UNION ALL
SELECT 254, 5, 0.0225

select * from @finddupseries

The records for portid 250 and 254 match.

Is there any way I can write a query to detect this? edit: yes, the entire series must match. Also, if there was a way to determine which one it DID match would be helpful as the actual table has around 10k records.

thanks!