Have (simplified) a table like this: CREATE TABLE TABLE1( [PATIENT_ID] INTEGER PRIMARY KEY, [ADDRESS] TEXT, [DATE_OF_BIRTH] TEXT)
DATE_OF_BIRTH is in the ISO8601 format yyyy-mm-dd Now I need a SQL to find the oldest patients living at all the different (unique) addresses, so this will be the patient with the lowest DATE_OF_BIRTH. I will need the PATIENT_ID of that patient and nil else. Seems simple, but I had trouble getting this and eventually came up with: SELECT T1.PATIENT_ID FROM TABLE1 T1 WHERE T1.DATE_OF_BIRTH || T1.ADDRESS IN (SELECT MIN(T2.DATE_OF_BIRTH) || T2.ADDRESS FROM TABLE1 T2 GROUP BY T2.ADDRESS) This seems to work fine, but I am not sure if this SQL is correct and if the results will always be correct and have a feeling that there must be a better construction. Any suggestions? RBS _______________________________________________ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users