Thank you all for your explaination.
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Nilesh,
They should generate equivalent results,
But the difference is the constraint on bu.bid=5.
In the 1st case it's being done after the join.
In the 2nd case it is being done before the join.
The end result should be the same, but the execution time can be hugely
different.
Suppose b ha
Hi,
Some ways to do that:
http://www.sql-ex.ru/help/select16.php
> Hi list,
> I have two table that are so represented:
> t1:
> id int primary key
> ... other
> t2:
> id int primary key
> t1id int fk(t1.id)
> somedate date
> ... other
> data t1:
> 1 | abcde
> 2 | fghi
> data t2:
> 1 | 1 | 2010-05-
On 6 June 2010 06:30, Nilesh Govindarajan wrote:
> 1. SELECT b.* from banners b, banners_users bu where b.id = bu.bid and
> bu.uid = 5;
>
> 2. SELECT b.* from banners b INNER JOIN banners_users bu ON b.id =
> bu.bid AND bu.uid = 5;
Here is an explanation:
http://www.postgresql.org/docs/8.4/intera
