Any differences between inner join and join without any keyword(inner join)

Question

Are there any differences between following two join statements?
Join Statement 1:
select column1, column2 from table1 t1, table2 t2 where t1.t1Key=t2.t2Key;
Join Statement 2:
select column1, column2 from table1 t1 inner join table2 t2 on t1.t1Key = t2.t2Key;
Thanks for your reply.
Kevin

Answer 1

Hi, Kevin,
user13531850 wrote:
Are there any differences between following two join statements?To the system, those two are equivalent. They will produce exactly the same results, and will probably result in the same execution plan, so they will be equally efficient.
Some people find it easier to read and understand one rather than the other. Personally, I find the ANSI syntax (JOIN ... ON ...) easier to understand. The join conditions that apply to each table are listed right next to the table; you don't have to hunt through a long WHERE clause to find them. Also, it makes debugging easier. If you forget the join condition, then you get a syntax error, pinpointing where you forgot the join condition. Using the old syntax, if you forget a join condition, you get a cross-join, and it may not be obvious that any error occurred, but even if you do notice the mistake, you have no clue where it happened.
Join Statement 1:
select column1, column2 from table1 t1, table2 t2 where t1.t1Key=t2.t2Key;This is the old join syntax. It works in all versions of Oracle (so far).
Join Statement 2:
select column1, column2 from table1 t1 inner join table2 t2 on t1.t1Key = t2.t2Key;This is the ANSI join syntax. It works in Oracle 9.1 and higher. The keyword INNER is optional.