On Sat, 16 Jan 2016 14:26:20 -0700
"Keith Medcalf" wrote:
> > the result is nondeterministic if more than one row in S matches.
> > The update applies all rows in S matching T. Of course, only the
> > last one is preserved. Of course, because order is nonsemantic,
> > there's no way to know
On 2016/01/16 10:18 AM, audio muze wrote:
> Thanks Keith
>
> That's what I'd tried with my first attempt but naturally it didn't work.
>
> Why is it that SQLite does not support a FROM clause in an update statement?
Because of the intent expressed with the word "Lite" in SQLite and the
fact
On Sat, 16 Jan 2016 10:18:28 +0200
audio muze wrote:
> Why is it that SQLite does not support a FROM clause in an update
> statement?
I can't answer why, but I can tell you it's fraught with potential
error. Inventing syntax runs the risk of supporting undesirable
behavior.
SQL Server has
> I can't answer why, but I can tell you it's fraught with potential
> error. Inventing syntax runs the risk of supporting undesirable
> behavior.
>
> SQL Server has such a syntax. Unfortunately, when you say:
>
> update T ... from S
Pretty much everything does. Yes, Sybase Transact
Thanks Keith
That's what I'd tried with my first attempt but naturally it didn't work.
Why is it that SQLite does not support a FROM clause in an update statement?
On Sat, Jan 16, 2016 at 10:07 AM, Keith Medcalf wrote:
>
> Of course, if there was a FROM clause for UPDATE it would be as simple
> Is it a typo in inner query or you ARE asking for a resource from target?
Apologies all, I'm fast asleep, it should've read:
UPDATE target
SET resource = (
SELECT s.resource FROM source s
WHERE ( s.ID = ID AND s.resource IS NOT NULL )
);
Apologies if I'm asking an obvious question, but I've searched and
tried various options and have not been able to arrive at an UPDATE
statement in SQLite that does what I need.
I've two tables with a unique identifier that enables me to link them.
I'm wanting to update the values of a particular
Hi,
On Sat, Jan 16, 2016 at 12:58 AM, audio muze wrote:
> Apologies if I'm asking an obvious question, but I've searched and
> tried various options and have not been able to arrive at an UPDATE
> statement in SQLite that does what I need.
>
> I've two tables with a unique identifier that
Of course, if there was a FROM clause for UPDATE it would be as simple as:
UPDATE target
SET resource = source.resource
FROM source
WHERE source.id = target.id
AND source.resource IS NOT NULL;
This is semantically the same as:
SELECT ...
FROM target, source
WHERE source.id =
On Friday, 15 January, 2016 22:58, audio muze said:
> Apologies if I'm asking an obvious question, but I've searched and
> tried various options and have not been able to arrive at an UPDATE
> statement in SQLite that does what I need.
> I've two tables with a unique identifier that enables me
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