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CREATE TABLE patient_test ( Patient VARCHAR(7), Test VARCHAR(6), Value FLOAT ); INSERT INTO patient_test (Patient, Test, Value) VALUES ('Laura', 'Test A', '1.3'), ('Laura', 'Test B', '8.9'), ('Laura', 'Test B', '8.9'), ('Laura', 'Test C', '8.9'), ('Charles', 'Test B', '8.9'), ('Charles', 'Test B', '4.6'), ('Charles', 'Test C', '5.6'), ('Maria', 'Test A', '1.2'), ('Maria', 'Test A', '1.2'), ('Maria', 'Test B', '1.2'), ('Maria', 'Test B', '8.9'), ('Maria', 'Test C', '1.2');
Records: 12 Duplicates: 0 Warnings: 0
SELECT Test, COUNT(DISTINCT Patient, Value) AS Result FROM patient_test GROUP BY Test;
Test
Result
Test A
2
Test B
5
Test C
3