Here is the situation. I have one database table "TB_Patient" with the columns below:
PATIENT_ID PATIENT_GROUP FIRSTNAME LASTNAME ADDRESS I want to get PATIENT_ID randomly from certain PATIENT_GROUP. There are 5 PATIENT_GROUP only with total row in the table is about 10000 (10K). The number of data per PATIENT_GROUP is not the same. Certain PATIENT_GROUP has less data than the others. Do you know the FASTEST possible SQL query for this task? When there is NO PATIENT_GROUP, I could come up with this query: SELECT PATIENT_ID FROM TB_Patient WHERE rowid >= (ABS(RANDOM()) % (SELECT MAX(rowid) FROM TB_Patient)) LIMIT 1 But now, I must get the data from certain PATIENT_GROUP. What's your best approach to solve this? The objective is the fastest possible query. Thanks. -- Regards, E. Lung _______________________________________________ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
