Hello all! I have two tables in my database: results(20 000 rows) and data_lab1(3 000 rows) Both are related by a sample number (sample_id.) I need to find the samples of data_lab1 table that they are not in results table.
I think the following query is the solution: SELECT data_lab1.sample_id, results.sample_id FROM data_lab1 LEFT JOIN results ON results.sample_id = data_lab1.sample_id WHERE results.sample_id IS NULL But 15 minutes later, it does not return any results and then I stop it. I don't have a lot of experience with MySQL. My system is: PC: Pentium 3, 900 MHz, 512 MB-RAM White Box Linux 3 MySQL v4.0 Something wrong with the query?, another idea?, thanks in advance for any suggestion, regards Juan P. Espino -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED]
