Question

Given these two tables:

A.a   B.b
-     -
1     3
2     4
3     5
4     6

If I want a cross matching I can do both

SELECT * FROM A, B WHERE A.a = B.b; # and
SELECT * FROM A INNER JOIN B ON (A.a = B.b)

Or if I want a LEFT OUTER JOIN or RIGHT OUTER JOIN

SELECT * FROM A,B WHERE A.a = B.b(+); # and
SELECT * FROM A LEFT OUTER JOIN B ON (A.a = B.b)

But are there any engine/performance differences between query statements?

Answer 1

They most likely generate the same plan on modern RDBMS. The JOIN syntax is the ANSI SQL syntax since 1992.