Hey Eric,
What do you mean? I have not run into a SQL DBMS that does not support both WHERE and INNER JOIN.
-Charlie
On 4/3/2019 4:35 PM, Eric Selje wrote:
Just be aware that VFP's SQL lets you get away with that, but not all incarnations of SQL will.
Eric
On Tue, Apr 2, 2019 at 5:22 PM Charlie-gm ccbibleman@gmail.com wrote:
My experience has shown either syntax (WHERE vs INNER JOIN) to provide the same result without noticeable performance difference.
I think the INNER JOIN syntax was added later in the SQL standards.
If you solely use JOIN statements, one could argue the readability is better (aka more explicit). Other than that, perhaps a particular DBMS would "optimize better" with INNER JOIN or WHERE - but I kind of doubt it.
-Charlie
On 4/2/2019 6:05 PM, Garrett Fitzgerald wrote:
Hey, all. I had a general SQL question. Often, I find myself needing to
use
the syntax:
FROM a LEFT JOIN b ON a.key = b.key AND b.field = 'Value'
because if I filter b.field in the WHERE clause, I've effectively made
the
LEFT JOIN an inner one.
That makes me wonder, at what point do we stop moving conditions to the JOIN clause? Obviously, some can't move for syntactical reasons, such as subqueries. But short of that, when does it make sense to limit a
non-outer
join in the join criteria? Never?
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