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SQL 1: select * from t1 join t2 on t1.f1 = t2.f2
SQL 2: select * from t1,t2 where t1.f1 = t2.f2
The results that they return are same. Are there any differences between them? For example, in how the DBMS runs them, or in the query plan?
There is no operational difference between the two queries.
However, the explicit join notation is the better style to learn and use; leave the other for (as yet unchanged) legacy code.