On 11 Jul 2011, at 1:58, Tim Uckun wrote:
> I have two tables, traffic and sales. Each one has a date field and
> lists the traffic and sales broken down by various parameters
> (multiple rows for each date).
>
> If I run select (select count(*) from traffic) as traffic, (select
> count(*) from
I don't think you understand what JOIN does. Think of it as a double-nested
FOR loop: for each record that has the value on the left side of the JOIN,
it will match all records on the right side of the JOIN that meet the ON
criteria. For example, if I have two tables:
A (i int, j int):
i j
I have two tables, traffic and sales. Each one has a date field and
lists the traffic and sales broken down by various parameters
(multiple rows for each date).
If I run select (select count(*) from traffic) as traffic, (select
count(*) from sales) as sales; I get the following 49383;167807
if
