Must use the nested left join syntax?

I am currently an editing view. The view has one with a followed left join to an inner join such as this:

Select
T1.a,
T2.b,
T3.c
Of
(select 1 as a Union double all the)
Select 2 as double
) t1
left join
(select 1A, 11 b of all the double union)
Select 2A, 12 b of the double
) t2
on t1.a = t2.a
Join
T3 (select 11 b, 14-c double)
on t2.b = t3.b;
/ * - Try out: -.
A, B AND C
------- ------- -------
1-11-14
*/

The inner join converts left join in an inner join "de facto"? should I use nested join syntax in order to get the other ranks:

Select
T1.a,
T2.b,
T3.c
Of
(select 1 as a Union double all the)
Select 2 as double
) t1
left join
(select 1A, 11 b of all the double union)
Select 2A, 12 b of the double
) t2
on t1.a = t2.a
Join
T3 (select 11 b, 14-c double)
on t2.b = t3.b;
/ * - Try out: -.
A, B AND C
------- ------- -------
1-11-14
*/

Sorry, just saw your last join condition now:

on t2.b = t3.b;

This results in a JOIN INTERNAL to the EXTERNAL table JOINED to, will certainly lead to a result of diminshed set - not quite the same that forced an INNER JOIN, but the result is the same, Yes. So there are indeed of equivalence.

This, however, would not have resulted a reduced resultset:

on t1.a = t3.a;

But of course it is not possible, since the t3 has a column "a".

Tags: Database

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