How many patients with a normal level of complement 3 have a P pattern observed in the sheet of ANA examination?
normal level of complement 3 refers to C3 > 35; have a P pattern observed in the sheet of ANA examination refers to ANA Pattern = 'P'; Should compute the number of distinct ones
SELECT COUNT(DISTINCT T1.ID) FROM Examination AS T1 INNER JOIN Laboratory AS T2 ON T1.ID = T2.ID WHERE T2.C3 > 35 AND T1.`ANA Pattern` = 'P'