Hi all, I ran into an issue with the extension-functions.c file posted
here, in that iterating through the binary tree representation for
mode/median/quartile isn't done in a tail recursive way, which can cause a
stack frame violation:
*);
gets pointer as per usual, and if final parameter is non-null, provide a
'boolean' indicating that it was validly bound.
Thanks!
-dave
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s for the info. I wonder if it makes sense for me to include the
SQLITE_DEBUG in all debug configurations of my product? Does it have any
untoward effect other than maybe slowdowns etc?
-dave
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ULL
Lastly, if it helps, converting the query to:
SELECT a.id FROM t AS a INNER JOIN t as b ON a.id = b.id WHERE
a.id = 1 or a.id = 2 or a.id = 3;
Does /not/ crash.
(and nice work on the bisect! Lol)
-dave
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sqlit
State * p, char * zSql, _iobuf * in,
int startline) Line 16106
sqlite3.exe!process_input(ShellState * p) Line 16206
sqlite3.exe!wmain(int argc, wchar_t * * wargv) Line 16959
Hth a little.
Cheers,
-dave
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> On 2/19/19, dave wrote:
> > addition, but I have lost a capability relative to the
> prior scheme of using
> > high query cost along with a special flag communicated in
> pIdxInfo->idxNum,
> > that being the ablilty to emit contextual info as to why
rom the previous rejected plan? I don't know if
this would cause a problem or not.
Cheers!
-dave
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I've searched without success for this answer. I use SQLite3, Zeos and
Delphi so maybe this isn't a perfectly sqlite3 question but here goes:
What are the pros/cons of query.sql.text := 'some string'; versus
query.sql.add('some string');
Dave
---
This email has been checked
e staff,
> and everybody approved.
>
> --
> D. Richard Hipp
> d...@sqlite.org
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&
point I'll assume the 'NOT' variant of MATCH, LIKE, GLOB, REGEXP
are currently /not/ supported in xBestIndex, and just hope that maybe
someday they will be.
Cheers, and thanks for all the feedback!
-dave
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f the behaviour of 'is' in sqlite.
And if anyone has comnments regarding the first two issues I mentioned,
namely the absence of support of
NOT MATCH, NOT LIKE, NOT GLOB, NOT REGEXP
in xBestIndex()
And also the meaning/use of SQLITE_INDEX_CONSTRAINT_FUNCTION, that would be
super helpful.
Che
but I'm guessing that SQLite extends it's
meaning. Interestingly a search condition "where name is true" parses and
runs, but does /not/ cause invocation of xBestIndex at all.
Cheers!
-dave
> -Original Message-
> From: sqlite-users
> [mailto:sqlite-users-boun...@ma
with those embedded extensions
relative to the implementation in 3.20, but this may compell me to do so.
(I use shell.c in a special debug build of my product).
Thanks!
-dave
> -Original Message-
> From: sqlite-users
> [mailto:sqlite-users-boun...@mailinglists.sqlite.org] On
> Be
the
operator set in some way to present the negative clauses at some release in
the future?
Thanks for any info!
-dave
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AL TABLE CSV (...)
So maybe one would just need to modify the csvtabCreate to process some
additional parameters and propagate those settings to the implementation.
-dave
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on
* you can make that registration more transparent by using the
sqlite3_auto_extension() mechanism
HTH
-dave
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Wouldn't it be as simple as subscribing to the mailing list and harvesting
the emails directly from the inbound content? Because as it is, everyone's
real email already comes to me in the list messages I receive (as
'sqlite-users on behalf of x...@yyy.com')
The spam message I just received used
gt; able to create a valid sqlite3_stmt pointer from bytecode
> stored somewhere.
>
> -Ursprüngliche Nachricht-
> Von: sqlite-users
> [mailto:sqlite-users-boun...@mailinglists.sqlite.org] Im
> Auftrag von dave
> Gesendet: Sonntag, 15. April 2018 20:55
> An: sqlite-use
gt; --
> D. Richard Hipp
> d...@sqlite.org
Ah, groovy. Well, at least that is validation of the concept. So it sounds
like I have a side project for my copious free time!
-dave
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to approach the surgery.
-dave
> -Original Message-
> From: sqlite-users
> [mailto:sqlite-users-boun...@mailinglists.sqlite.org] On
> Behalf Of Simon Slavin
> Sent: Sunday, April 15, 2018 2:06 PM
> To: SQLite mailing list
> Subject: Re: [sqlite] kooky tho
for the whole system).
Anway, has this been discussed before? Or is it a fool's errand?
Cheers!
-dave
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On Tue, Jan 9, 2018 at 7:28 PM, Hick Gunter wrote:
> A bound blob or string is destroyed "after SQLite has finished with it". This
> should be the case when sqlite3_clear_bindings() is called. Are you sure it
> is not deleted then? Code reading suggests it should be.
>
> Other
I have cycle like this:
```c
const char sql[] = "INSERT INTO test (pk, geom) VALUES (?, ?)";
sqlite3_stmt *stmt;
sqlite3_prepare_v2 (handle, sql, strlen (sql), , NULL);
for (...) {
sqlite3_reset (stmt);
sqlite3_clear_bindings (stmt);
int blob_size = ..;
unsigned
> -Original Message-
> Behalf Of J Decker
...
> <peter.nichvolo...@gmail.com> wrote:
>
> > Dave. The documentation contains many such catch-all
> statements which do
...
> > The current decision tree of the particular catch-all
> documentation c
, 613; 616, 617
(I stopped grepping at this point; this list is not comprehensive).
Anyway, just wondered if the api documentation's advice is maybe out-of-date
with current reality. Thoughts/comments?
Cheers!
-dave
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sq
to the ones I used
* etc.
Cheers,
-dave
//fileio.patch start ===
18a19,21
> #if defined(WIN32) || defined(WIN64) || defined(WINDOWS)
> #include
> #endif
29a33,73
> #if defined(WIN32) || defined(WIN64) || defined(WINDOWS)
> const char* zName;
> int
recently had some trouble using the readfile()
...
>
> Attached herewith.
>
> Cheers!
>
> -dave
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builds.
Attached herewith.
Cheers!
-dave
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er host
language you are going to build the product in, because all the various
language bindings (except for C) are separate projects and they differ.
Just a thought; cheers
-dave
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http://m
it has it's reasons. I should study the
query planner implementation one day when I have some time
Cheers!
-dave
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guides
the query planner more strongly in some direction. It also sounds like what
I was doing (described in my first message, here elided), was fine.
Thanks, and cheers!
-dave
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inking? Thanks in advance; cheers!
-dave
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les.
>
Thanks for your input as well; I somehow missed it until just now.
Cheers!
-dave
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jects I've definitely used the counter trick before, caching the
underlying data (to support updates and transactions) but those were known
to be small datasets. This stuff coming from APIs could be big, so I wanted
to avoid caching it all. But one does what one must
Thanks for all the feedb
> On 10/16/17, dave <d...@ziggurat29.com> wrote:
> > Hi, I am building a system which involves a number of virtual table
> > implementations. They are all read-only, but will be
> involved in a bunch of
> > joins amongst themselves. My question is this:
> &
in particular because implementing it will be quite awkward for the
underlying implementation in my case, and I'd very much prefer to skip it.
Even a 'without rowid' table would imply specifying some primary key, which
in a few cases would also be awkward.
Thanks in advance,
-dave
l
> table are in reasonable proportion, everything should work fine.
Thanks! I like the idxNum tweak for the error message; I'll add that stuff
in.
And the info about relative costs _on_the_same_virtual_table_ is very
enlightening because I suppose the converse is true, that the e
is far! And thanks even more if anyone
can advise on how to deal with xBestIndex and required constraints on an
eponymous vtable acting as a table-valued function!
Cheers;
-dave
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It seems that it is not possible to specify the concatenation separator
when using GROUP_CONCAT with DISTINCT.
For example while this works
SELECT pub_id, GROUP_CONCAT(cate_id, " - ")
FROM book_mast
GROUP BY pub_id;
and this works
SELECT pub_id, GROUP_CONCAT(DISTINCT cate_id)
FROM book_mast
I assume this will work in a similar fashion for Python?
On Thu, Apr 6, 2017, at 03:24 PM, Simon Slavin wrote:
>
> On 6 Apr 2017, at 7:38pm, dave boland <dbola...@fastmail.fm> wrote:
>
> > "unconfigured means no tables, no fields, no nothing. With SQLite, it
> &
to do that. So, what (and why) are the steps to test the
database file to see what state it is in?
Thanks,
Dave
>
> I’m not sure what you mean by "unconfigured" so I’ll let other people
> write about that, or you can pos
to
documentation that I may have missed.
Thanks,
Dave
--
dave boland
dbola...@fastmail.fm
--
http://www.fastmail.com - A fast, anti-spam email service.
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Thanks all for your input, it has really helped.
In my real world application tmp_keep is a temporary table populated by
examinining a number of other tables etc., and I suddenly realsied that it
could even contain duplicate ids. Sloppy thinking on my part.
I get the best results by creating
Could be keep almost all the records so ~50, but it varies greatly so
sometimes will be just keep 10. I can adjust approach depending on size if
necessary.
Yes the id1 are integer primary keys.
Table1 has a number of indexes and views, so the create new table approach
is less attractive
Say table1 has more then 50 records, and there is a second table
tmp_keep with the ids of the records in table1 to be kept, the rest need to
be deleted. The number of records in tmp_keep can vary from 0 to all the
records in table1, with any values in between.
What is the best strategy for
"+lots" for OVER and PARTITION BY!
Very useful in my line of work as well.
Cheers,
Dave
Ward Analytics Ltd - information in motion
Tel: +44 (0) 118 9740191
Fax: +44 (0) 118 9740192
www: http://www.ward-analytics.com
Registered office address: The Oriel, Sydenham Road, Guildfo
Some simple testing is showing using an EXISTS statement is generally
quicker then using an IN
e.g.
SELECT * FROM tablea
WHERE EXISTS (SELECT 1 FROM tableb WHERE tablea.id = tableb.id AND ...)
is quicker than
SELECT * FROM tablea
WHERE tablea.id IN (SELECT tableb.id FROM tableb WHERE ...)
Is
Looking for the best way to query a table with an integer column by value
of the lower 16 bits of the data in that column. Does SQLite support
bitwise logic?
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Can I confirm that defining feilds as VARCHAR(20) rather than TEXT, if I
know I only want 20 chars or less, will result in a smaller database?
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environment up to date.
However, the documentation includes the following: "They work all day, in
parallel, each making their own customizations and tweaks to the design. "
Does the "to the design" imply that this feature would also cater for DDL
changes to tables, indexes
How about something like:
WITH RECURSIVE
expansion(byte) AS (
SELECT 0
UNION ALL
SELECT byte + 1 FROM expansion
LIMIT 10
)
SELECT PRINTF('%02d',byte)
FROM expansion
;
Cheers,
Dave
Ward Analytics Ltd - information in motion
Tel: +44 (0) 118 9740191
Fax: +44 (0) 118 9740192
fit within the HSM's on-board storage. These
devices usually only have a small amount of storage -- enough to store 4096
keys, for example.
But if there were an HSM that shipped with a "real" amount of memory and
storage -- and was generically programmable -- there's no reason it couldn't b
and extension functions, so I have at least some idea what I'm getting
into.
Dave
Sent with inky<http://inky.com?kme=signature>
g the .dat file on SELECTs.
(BTW, I'm using WAL mode and have found it performs better than standard
journal mode on pretty much every target device.)
Dave
Sent with inky<http://inky.com?kme=signature>
"Dave Baggett" wrote:
OK, that helps -- thank you.
One cla
? Here I am talking about the meta level above the transaction level -- I
have atomic transactions and I want to defer physically writing them until I
have enough of them (say, 16MB worth of altered pages).
Dave
Sent with inky<http://inky.com?kme=signature>
"Simon Slavin" wrote:
using SQLite via apsw -- thanks
for that too!)
Dave
Sent with inky<http://inky.com?kme=signature>
"Roger Binns" wrote:
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1
On 17/02/16 06:37, Dave Baggett wrote:
> I'd welcome any suggestions
How about two databases?
the transition from memory (page cache, etc.) to disk
occurs, that would probably get me above n00b level of understanding, which
would help.
Dave
Sent with inky<http://inky.com?kme=signature>
"Simon Slavin" wrote:
On 17 Feb 2016, at 2:37pm, Dave Baggett wrote:
> I
rge groups of
transactions at once, minimizing the number of write calls.
I'd welcome any suggestions from SQLite experts on this.
Dave
Sent with inky<http://inky.com?kme=signature>
is to avoid the left join by
ensuring that all songs have at least one artist. This is a better data
design in the end.
On 14 February 2016 at 18:00, Clemens Ladisch wrote:
> Dave Blake wrote:
> > Is there anything I can do to get the optimiser to perform 1) with the
> same
> > efficie
5:15, Clemens Ladisch wrote:
> Dave Blake wrote:
> > What I see as wrong is that in 1) (and 4) ) we have a query of the form
> > A LEFT JOIN B WHERE clause involving index fields on A
> >
> > yet the optimiser does not search A, the outer table, first using the
>
table first. This is
> necessary for the join to work correctly.
But it is not scanning song, the outer table, first. It is not optimising
correctly.
Is there a way with 1) to get it to scan song first? Can you see why that
would be the optimal plan?
On 14 February 2016 at 10:49, Cleme
urrent behaviour is making views
unusable in my application.
On 12 February 2016 at 20:47, Clemens Ladisch wrote:
> Dave Blake wrote:
> >> It chooses a _correct_ plan.
> >
> > Really? With query 1) to select a song it first scans the song_artist
> table
> &
:34, Clemens Ladisch wrote:
> Dave Blake wrote:
> > I noticed my queries going very slowly after changing a join to a left
> > join, examination of the query plan showed that the optimiser was
> choosing
> > a poor plan.
>
> It chooses a _correct_ plan.
>
> &
I noticed my queries going very slowly after changing a join to a left
join, examination of the query plan showed that the optimiser was choosing
a poor plan. It only occurs when the left join is on a views, if explicit
tables are used instead then the problem does not occur.
To repeat the issue
frame."*
Is this an optimization? If I revert this single commit in my local copy, my
codec works fine. If I leave it in, I get a corrupt database error very soon
after startup.
Any pointers appreciated!
Dave
Sent with [inky](http://inky.com?kme=signature)
I can replicate this behaviour if I insert a zero-length string into the
column.
sqlite> create table foo(a);
sqlite> insert into foo values(5);
sqlite> insert into foo values("");
sqlite> select max(a) from foo;
sqlite> select min(a) from foo;
5
sqlite> select avg(a) from foo;
2.5
Is this a
time');
2006-03-12 05:00:00
1985: Sunday, 28 April
sqlite> select datetime("1985-03-09T12:00", 'localtime');
1985-03-09 04:00:00
sqlite> select datetime("1985-03-10T12:00", 'localtime');
1985-03-10 05:00:00
On 22 September 2015 at 17:32, Dave McKee wrote:
>
&g
for column names that are not unique), but I've
found that this makes large pieces of sql much easier to read -
particularly when you have to come back to them after a few months in order
to change something.
Cheers,
Dave
Ward Analytics Ltd - information in motion
Tel: +44 (0) 118 9740191
Fax: +44
>
>Do you still have a copy of the originally damaged Database? I believe a
>closer look to it will reveal more corruption than the assumed.
I have the original database. What other tests could I do to look for
evidence?
It appears (so far) that the database I reconstructed from the dump
>
>Do you still have a copy of the originally damaged Database? I believe a
>closer look to it will reveal more corruption than the assumed.
I have the original database. What other tests could I do to look for
evidence?
It appears (so far) that the database I reconstructed from the dump
>
>Do you still have a copy of the originally damaged Database? I believe a
>closer look to it will reveal more corruption than the assumed.
I have the original database. What other tests could I do to look for
evidence?
It appears (so far) that the database I reconstructed from the dump
>
>Do you still have a copy of the originally damaged Database? I believe a
>closer look to it will reveal more corruption than the assumed.
I have the original database. What other tests could I do to look for
evidence?
It appears (so far) that the database I reconstructed from the dump
>
>The only safe thing to do is to drop the index and remake it. Or do to
>something which does that (e.g. VACUUM).
As I said, the first step in my repair was to drop the offending index.
>
>The only safe thing to do is to drop the index and remake it. Or do to
>something which does that (e.g. VACUUM).
As I said, the first step in my repair was to drop the offending index.
I have some addition evidence that there is an underlying problem,
exacerbated by some failure in SMB file sharing.
In this instance, there is a set of duplicated records that did not
directly cause an indexing error, but which could have been created
if a transaction failed (presumably due to a
Thanks for the help Igor. :-)
Dave
On 3/7/2015 1:37 PM, Igor Tandetnik wrote:
>
>
> On 3/7/2015 11:42 AM, Dave wrote:
>> Now when trying to use the database I see that I should have made 1
>> table with all the related data (I think) and am trying to copy one
>&g
t; too. So that makes its use more like hard coded data which I want
and need. When I learned VB years ago I got stumped often but over time
things started to "click". I am waiting to hear those clicks with SQLite
soon. :)
Thanks,
Dave
(also in Florida)
On 3/7/2015 8:03 PM, Jim Callahan wrot
On 3/7/2015 7:18 PM, Darren Duncan wrote:
> On 2015-03-07 9:59 AM, Simon Slavin wrote:
>> On 7 Mar 2015, at 4:42pm, Dave wrote:
>>
>>> I am fairly new at this although I have wanted to learn and tried
>>> again and again...But I have a problem. I created a database an
.
Thanks again,
Dave
On 3/7/2015 3:06 PM, R.Smith wrote:
>
>
> On 2015-03-07 10:55 PM, Dave wrote:
>> Ryan,
>> I have been to the link below but was under the impression that SQL
>> and SQLite are two different things so I usually just look up SQLite
>> help. I can do
. Thanks for understanding and having been where I am now. It
make me feel better already. :-)
Dave
On 3/7/2015 2:44 PM, R.Smith wrote:
>
>
> On 2015-03-07 10:32 PM, Dave wrote:
>> Ryan,
>> Thanks for your reply. As I mention in my last post:
>>
>> I got it sort
On 3/7/2015 1:42 PM, R.Smith wrote:
>
> Hi Dave, you did not give us the schemata so I'm going to guess you
> have tables like this:
>
> CEATE TABLE T1("ID" INT PRIMARY KEY, "val1" TEXT);
> CEATE TABLE T2("ID" INT PRIMARY KEY, "val2"
progress, but have a long way to go. Good thing for me is I
plan to use my database (for now) as basically a "flat file" where my
app will just use the related data in click events to further process.
Thanks again,
schemer
On 3/7/2015 1:42 PM, R.Smith wrote:
>
>
> On 2015-0
and got an answer within 30 minutes. :-)
Thanks,
schemer
On 3/7/2015 1:35 PM, Paul Sanderson wrote:
> Dave
>
> I'm not sure exactly what you are trying to do from your description -
> the schema of the tables you have and those that you want may help.
>
> But as a general idea
well, I had my app data "hard coded" in the past and decided to use a
database to make it easier. I am sure it will be, once I get more
experience.
schemer
On 3/7/2015 11:59 AM, Simon Slavin wrote:
> On 7 Mar 2015, at 4:42pm, Dave wrote:
>
>> I am fairly new at this although
I am fairly new at this although I have wanted to learn and tried again
and again...But I have a problem. I created a database and probably did
it wrong and I am trying to fix it. I made a database with 7 tables in
it all with a primary key and a record ID that matches the primary key.
Now
If you can .dump it, can you also use .read to restore it? And if so, how
damaged does it appear to be?
My databases, with a corrupt index, couldn't be restored directly, but
the duplicate entries could be seen, cleaned up, and then the restore
succeeded. Or (more conveniently) remove the index
I'd be interested if you could characterize the corruption. For
example, can use still use .dump to dump the database, and if so
what kind of damage is there?
The cases I've encountered recently, the "corruption" was only
a few duplicated records, which broke the uniqueness constraint
on an
I'd be interested if you could characterize the corruption. For
example, can use still use .dump to dump the database, and if so
what kind of damage is there?
The cases I've encountered recently, the "corruption" was only
a few duplicated records, which broke the uniqueness constraint
on an
>
>You might want to read my message on the topic from the list archives,
>dated Sat, 31 Jan 2015.
In this case, no concurrent or multiple users are involved. It's just
one client and the database. There's still plenty of scope for the
networked file system to do things that make sqlite
>
>Can you provide the schema (the CREATE TABLE and any CREATE INDEX commands)
>for that table ?
CREATE TABLE preference_table (
preferenceSet text,/* name of this preference group */
preferenceName text, /* a preference in this group */
preferenceValue text /* sort order of this
We're experiencing a new, recurrent failure mode in an old (ie; not recently
changed) sqlite application. This may be associated with buggy networked
file system implementations (thanks to apple and/or microsoft)
The apparent problem is that indexes on a small table become corrupted
by not
We're experiencing a new, recurrent failure mode in an old (ie; not recently
changed) sqlite application. This may be associated with buggy networked
file system implementations (thanks to apple and/or microsoft)
The apparent problem is that indexes on a small table become corrupted
by not
>
>The has been in shell.c since 3.8.6. We are on 3.8.8. Why
>not upgrade?
>--
Here in the real world, when everything is working, we ask "why upgrade".
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>
>The has been in shell.c since 3.8.6. We are on 3.8.8. Why
>not upgrade?
>--
Here in the real world, when everything is working, we ask "why upgrade".
>
>
>OK. Dave, please try this patch at let us know if it works better for
>you: https://www.sqlite.org/src/info/80541e8b94b7
>
It needs #include to compile in my sources.
With that, it seems to fix the problem.
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>
>
>OK. Dave, please try this patch at let us know if it works better for
>you: https://www.sqlite.org/src/info/80541e8b94b7
>
It needs #include to compile in my sources.
With that, it seems to fix the problem.
>
> .once '| sqlite3 new.db'
> .dump
.Once is not a command in the version of sqlite3 I use.
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>
> .once '| sqlite3 new.db'
> .dump
.Once is not a command in the version of sqlite3 I use.
>
>> But that doesn't explain the difference between redirecting to a file
>> and redirecting to a pipe.
using .output file works
using > to direct stdout to a file works and produces the same file as .output
using .read file works
using < file does not work.
using | to shortcut > and < doesn't
>
>> But that doesn't explain the difference between redirecting to a file
>> and redirecting to a pipe.
using .output file works
using > to direct stdout to a file works and produces the same file as .output
using .read file works
using < file does not work.
using | to shortcut > and < doesn't
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