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CREATE TABLE Table1 (`ID` int, `WSF_REF` int, `TYPE` varchar(4), `WEIGHT` int) ; INSERT INTO Table1 (`ID`, `WSF_REF`, `TYPE`, `WEIGHT`) VALUES (1, 1, 'Pike', 10), (2, 1, 'Pike', 10), (3, 1, 'Pike', 10), (4, 1, 'Pike', 10), (5, 1, 'Pike', 10), (6, 1, 'Pike', 10), (7, 1, 'Asp', 10), (8, 1, 'Asp', 10), (9, 1, 'Asp', 10), (10, 1, 'Asp', 10), (11, 1, 'Asp', 10), (12, 1, 'Asp', 10), (13, 2, 'Pike', 10) ;
SELECT WSF_REF, SUM( CASE WHEN cnt <= 5 THEN WEIGHT ELSE 1 END ) as Total_Weight FROM ( SELECT t.*, row_number() over (partition by `WSF_REF`, `TYPE` ORDER BY `ID` ) as cnt FROM Table1 t ) x GROUP BY WSF_REF
WSF_REF
Total_Weight
1
102
2
10