#1066 - Not unique table/alias: error while running an command

Question

Ihave created 2foreign keys customer id and now iam tryin to run this command to getan output but get this error#1066 - Not unique table/alias: enter code here { SELECT productid FROM javabase . sales JOIN sales on sales . customerid = customer . customerid where customer . customername = Babu ; }

Answer 1

You have to use at least one alias when you join a table to itself. So instead of FROM sales JOIN sales it would be FROM sales S1 JOIN sales S2