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Create Table tbl_name(sensorID INT, timestamp INT, sensorField1 VARCHAR(50)); Insert Into tbl_name Values (1,13,'r'), (1,13,'h'), (2,14,'r'), (2,14,'h'), (3,14,'h');
5 rows affected
Select sensorID, timestamp, sensorField1 From tbl_name T Where T.sensorField1 = 'r' Or (T.sensorField1 = 'h' And Not Exists (Select 1 From tbl_name D Where D.sensorID = T.sensorID And D.sensorField1 = 'r') )
sensorid
timestamp
sensorfield1
1
13
r
2
14
r
3
14
h