> Alternatively, you can use the new GENERATED ALWAYS AS (...) STORED to make
> it an automatically updated stored field and you do not need triggers at all,
> just a version of SQLite3 that does generated columns (version 3.31.0 from
> 2020-01-22 or later).
>
> create table MyData
> (
> id
> What stops the
> UPDATE ports SET timeofday = CURRENT_TIMESTAMP WHERE id = NEW.id ;
> from also triggering the AFTER UPDATE ON recursively?
>
> Perhaps a pragma or inSQLite are triggers non-recursive by default?
>
> I am using (now I have by semi-colons right)
> CREATE TRIGGER tgrUpdate AFTER
Thanks Andy
> In addition, the role of the "when" clause is unclear. Is it necessary?
>
> I don't think it is. I have a very similar trigger which I've been using
> for several years
> And it doesn't have the where...
>
> CREATE TRIGGER [UpdatePortTime] AFTER UPDATE ON ports
> FOR EACH ROW
>
Ha, my error - missing ";" in the UPDATE clause but I was blind.
On Thu, 12 Mar 2020 at 08:18, David Blake wrote:
> Thanks for such a swift reply, good to know that it should work (without
> typos)
>
> >Thank you very much for keeping the error message secret.
>
, 12 Mar 2020 at 08:04, Clemens Ladisch wrote:
> David Blake wrote:
> > CREATE TRIGGER my_update_trigger BEFORE UPDATE ON My_table
> > FOR EACH ROW WHEN NEW.lastupdated < OLD. lastupdated
> > BEGIN
> > UPDATE my_tableSET lastupdated = DATETIME('now') WHERE id
I'm looking for an easy way to maintain a last updated column for each
record in several tables and considering if using a triggers is viable.
I thought that defining a trigger like this on each table would work
CREATE TRIGGER my_update_trigger BEFORE UPDATE ON My_table
FOR EACH ROW WHEN
I see this. What does it mean? Does it mean even when the sqlite3
session is closed there is still -wal and -shm left on the disk?
"""
There is an additional quasi-persistent "-wal" file and "-shm" shared
memory file associated with each database, which can make SQLite less
appealing for use as
"I read somewhere that the DDL is really just a copy of the text when teh table
was created"
It starts that way, but the ALTER TABLE command will update that string when it
runs so that it reflects the new column.
Did you commit your changes after the alter table and before looking for the
Awesome---exactly what's needed.
The monotonicity of the time key variable is assured by how the data
is collected---but is there a way to express that in sqlite?
create table data (
key text primary key check
(julianday(key) > julianday(select max(key) from data),
data integer not null);
A before trigger which uses the raise function would stop it from getting
inserted in the first place.
create trigger cull
before insert on tbl
when new.value = (select value from tbl order by time desc limit 1)
begin
select raise(ignore);
end;
Or if you want it to actually return an error to
Jens Alfke asks:
>Maybe pass the column name as a string, i.e. `attr('H',3)`
2 problems with that idea. First, the first argument has to refer to a value in
the virtual table in order to invoke the overridden version (overrides are per
table, so I use the ppArg to bind function invocation to
I’ve written a virtual table to view spreadsheet data inside Excel workbook
(.xlsx) files as SQlite tables. I want to implement an SQL function, attr(),
which the virtual table overrides to give access to the raw attributes of the
cell being returned. I’m looking for a robust way to find the
Not necessarily related to the question itself, but how did the attachments
actually come through with this mail? Every single other person to try and
attach something to this list has had it stripped off.
-Original Message-
From: sqlite-users On Behalf Of
?
Sent:
> CREATE TABLE vocabulary(word TEXT PRIMARY KEY, count INT DEFAULT 1);
> INSERT INTO vocabulary(word) VALUES('jovial')
> ON CONFLICT(word) DO UPDATE SET count=count+1;
>
> Shouldn't that actually be written as "vocabulary.count+1"?
Nope. Unqualified names there refer to the one and only record
Follow the link at the bottom of every email. The bottom box/button on the page
is for unsubscribing.
http://mailinglists.sqlite.org/cgi-bin/mailman/listinfo/sqlite-users
-Original Message-
From: sqlite-users On Behalf Of
Ainhoa B
Sent: Wednesday, February 5, 2020 9:11 AM
To: SQLite
eries are not supported
(detail!=full" (and a SQLITE_ERROR calling step()).
I'm quite confused with the behaviour I'm seeing here. Any guidance is
appreciated.
Thanks
David
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They shouldn't be different, no. Do you have a copy of the weird version of the
database still, or have a copy of the explain text and the sqlite_master
contents? Was there another index or table whose root page is what was listed
in the explain output? For example, were you expecting it to use
The core functions of the library are fairly unlikely to get expanded upon at
this point, so it's up to the application using the SQLite library to expand on
them.
You can load an extension which has those functions. Or the C API gives you
means to add your own functions.
For Python, the
> Is there a complete list that defines what are "the statements that
> modify the database"? What is the difference between "the statements
> that modify the database" and "Data Modification Language (DML)
> statement"? Are they the same?
If you dig into their code you can attempt to find what
e: [sqlite] conditional insert operations
h1, h2 pair are unique.
I don't quite understand your example. Could you explain what it does
in plain English so that I can be sure it does what I want? (What is
v?)
On 1/30/20, David Raymond wrote:
> Is the combo of h1, h2 unique? If so you could do
To get the comments the library needs to have been compiled with
SQLITE_ENABLE_EXPLAIN_COMMENTS flag
https://www.sqlite.org/compile.html#_options_to_enable_features_normally_turned_off
That setting is off by default, but for the pre-compiled CLI they do include it.
I'm not seeing it in the list
d to
h1,h2,v
a,,X
a,A,1
a,B,2
...
On 1/30/20, David Raymond wrote:
> I'm not quite following what you're trying to do here. Could you provide a
> few examples of "here's what used to be in there", "here's what I want to
> insert", "here's what it should like in
From a Windows installation of 12.0
testing=> select version();
version
PostgreSQL 12.0, compiled by Visual C++ build 1914, 64-bit
(1 row)
Time: 0.283 ms
testing=> create table foo (
testing(> a text,
I'm not quite following what you're trying to do here. Could you provide a few
examples of "here's what used to be in there", "here's what I want to insert",
"here's what it should like in the end"
-Original Message-
From: sqlite-users On Behalf Of
Peng Yu
Sent: Thursday, January
Incorrect.
"Not specifying one" is
sqlite3.connect(fi)
And the connection will still start implicit transactions for you. (with
"begin;")
"Setting it to None" is
sqlite3.connect(fi, isolation_level = None)
Which will turn off all implicit transactions, put it in autocommit mode, and
you have
That's just my own personal paranoia wanting to make sure the cursor always
gets closed, even on an exception. As I don't think the normal context manager
on a cursor closes it when it exits.
In the real world it's probably overkill as
a) The destructors probably take care of that
b) It's the
https://docs.python.org/3.8/library/sqlite3.html#sqlite3-controlling-transactions
"You can control which kind of BEGIN statements sqlite3 implicitly executes via
the isolation_level parameter to the connect() call, or via the isolation_level
property of connections. If you specify no
The mailing list strips all attachments, so you'll have to either provide a
link to it on some external source, or give more create table/insert statements
like at the bottom.
Without having all the data I'll say: Remember to use single quotes for text
literals. You have
...and
-Original Message-
From: sqlite-users On Behalf Of
Peng Yu
Sent: Thursday, January 30, 2020 5:16 AM
To: SQLite mailing list
Subject: Re: [sqlite] Does .commit() ensure the .execute()'s and
.executemany()'s called before are run atomically?
Could you show a python example on how to
It's going to run both since you asked it to. Even if it was in a compiled
language where the compiler could look ahead and was looking to implement that
sort of optimization, then for example there still might be triggers on the
table which would need to be run, or other constraints on the
I think of it as direct access, though I could see people confusing that with
Windows Server DirectAccess.
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Edit, that last part should say "skim server" :D
On Mon, Jan 27, 2020, 10:54 PM David Baird wrote:
> How about "skim server"? So if, "server" means a whole server, then like
> whole milk versus skim milk, a fraction of a server becomes severless :)
>
How about "skim server"? So if, "server" means a whole server, then like
whole milk versus skim milk, a fraction of a server becomes severless :)
On Mon, Jan 27, 2020, 9:57 PM Stephen Chrzanowski
wrote:
> I'd stick with "serverless". The marketing teams that make "serverless"
> mean that
This is technically valid CASE syntax which is why you're not getting an error,
it's just not what you're looking for.
...
CASE
(SELECT c.WYear FROM t2 WHERE pid = a.a)
WHEN c.WYear = 2020 THEN “YES” ELSE “NO” END
) AS DIGITAL
...
What that is saying is take the value you get from this:
(SELECT
was able to put a coalesce around the data sum, and that does work.
The line strftime('%m') seemed very strange. I guess without a time string,
sqlite defaults the the current date and time. the sqlite docs don't mention
this.
David
On Saturday, January 18, 2020, 04:32:52 PM EST, Keith Medcalf
m periods in the past.
So can this report be done within a query?
Thanks,
David
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A note and a question on subqueries. On reading:
select
...
(select b from t where a == new.a and idate < new.idate order by idate desc) as
oldv,
...
My brain started yelling that that needed a "limit 1" on the subquery so that
it would only return 1 row.
I looked in the SQLite docs though
Well, I believe this is the relevant bit from the docs for binding:
https://www.sqlite.org/c3ref/bind_blob.html
"If a non-negative fourth parameter is provided to sqlite3_bind_text() or
sqlite3_bind_text16() or sqlite3_bind_text64() then that parameter must be the
byte offset where the NUL
Well something's weird anyway. When I open it with the command line tool it
queries it just fine. I tried to open it in Python to check all the characters
in the strings and got this:
Traceback (most recent call last):
File "...\Testing4.py", line 8, in
cur.execute("select * from
To create a new database you just open the file name you want, and if it
doesn't exist it will be created.
The actual new file creation is slightly delayed until it has to write
something to the disk. There are a couple of options that can only be set at
file creation time like page size, text
Along with the other replies already mentioned I'll pipe in with a reminder
that any large blob fields should be the final field in a table's definition.
Due to how the data is stored, to get the data for any particular field, SQLite
has to go through/decode the data for all previous fields in
My application naively tried preparing the statement: “CREATE VIRTUAL TABLE xxx
USING zipfile(?1);” and
binding the name of the zip file, supplied by user, to parameter 1 for
execution. This doesn’t work, and the documention reveals that this is by
design. I therefore have to expand the
Does anyone know if the original source code for the lemon parser still
exists, and if so, where to find it?
The lemon.c file shipped with sqlite, which the hwaci website points me at,
does not appear to be it --- instead it's an amalgamation of a bunch of
other files, including some generated by
Run...
pragma compile_options;
...and see if LIKE_DOESNT_MATCH_BLOBS is in the list that comes up.
If it is NOT in the list then both rows will show up. This is the case for the
precompiled Windows cli for example.
If it IS in the list, then only the second one that was inserted as text will
"So it suffices that I run "PRAGMA journal_mode=WAL;" once from say the
sqlite3 cli, for all future connections from any tool will use WAL mode for
this database file?"
Yup, the journal mode is stored in the database header. So the pragma will
update the file's header, and any new connection
Those lines on their own aren't any significantly slower or faster than each
other.
What's happening is that when you add in a function the planner has a harder
time determining if it can use certain optimizations. The "is not null" version
is simple enough where the planner says "ohh, I'm ok
The mailing list strips off all attachments, so you'll have to provide another
place to get that.
Alternatively could you post the schema here as text, along with the explain
query plan output from the slow version and from a fast version?
-Original Message-
From: sqlite-users On
SQLite is pretty good at using free space inside the file. So if inserting
something is going to run you out of space, then it's going to run you out of
space whether the file was previously vacuumed or not.
Also reminder that when vacuum is run, SQLite makes a brand new copy of the
database,
I _think_ the load_extension() function is what you'll be looking for, though I
could be wrong.
https://www.sqlite.org/lang_corefunc.html#load_extension
-Original Message-
From: sqlite-users On Behalf Of
Jose Isaias Cabrera
Sent: Tuesday, December 3, 2019 3:38 PM
To:
it anyway.
The line number for the report is 22845 in version 3.27.2
The line number for the report is 23065 in version 3.30.1
Kind regards,
David Brouwer
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Not the reason for the slowdown, but note that both of these are redundant:
CREATE INDEX IF NOT EXISTS data_table__data_id__pk_idx ON data_table (
data_id
);
CREATE INDEX IF NOT EXISTS ignore_me__ignored_id__pk_idx ON ignore_me (
ignored_id
);
...because you declared them as the
Dr Hipp replied to this 2 days ago with this:
Documentation fix https://www.sqlite.org/docsrc/info/a2762f031964e774
will appears in the next release.
".header" is an abbreviation for ".headers" and does exactly the same thing.
-Original Message-
From: sqlite-users On Behalf Of
John
names.name like '%'||query||'%'
> );
>
> On Fri, 22 Nov 2019 at 15:19, David Raymond
> wrote:
>
>> Or alternatively something like:
>>
>> select * from table
>> where exists (
>> select query from queries
>> where table.name like query
>> );
>>
Or alternatively something like:
select * from table
where exists (
select query from queries
where table.name like query
);
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"There's a small sidenote (that I'm too lazy too find right now) in the select
docs that mentions that, in case of using min or max as aggregate, the
non-aggregate columns will come from the row that held the min/max value."
Look in
https://www.sqlite.org/quirks.html
under "6. Aggregate
So why do you need a case? What will not work with the simple:
select sum(Expense)
from Expenses
where Date between date('now', '-1 months') and date('2019-11-04', '-1 days');
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Apparently it got smarter about "primary key unique" in 3.20.0 and stopped
making the extra index when it's a without rowid table. Don't see anything
about it in the release notes though.
Even on the current release "primary key unique" will still make an extra index
for the unique if it's a
Why not change it to something along the lines of:
UPDATE QR3PARAMS
SET ED = 1
WHERE
ED is not 1
AND EXISTS (
SELECT 1
FROM CURRENT_MED
WHERE
ID = QR3PARAMS.ID
AND (
TERM_TEXT GLOB 'Sildenafil*'
OR
TERM_TEXT GLOB 'Tadalafil*'
OR
TERM_TEXT GLOB 'Vardenafil*'
)
);
"Why is ED changed to '' or NULL for ID 5?"
When you update to a subquery which returns no rows, then the field gets
updated to null.
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ge-
From: sqlite-users On Behalf Of
Merijn Verstraaten
Sent: Thursday, November 7, 2019 2:16 PM
To: SQLite mailing list
Subject: Re: [sqlite] Deterministic random sampling via SELECT
> On 7 Nov 2019, at 19:16, David Raymond wrote:
>
> Along those lines SQLite includes the rev
: [sqlite] Deterministic random sampling via SELECT
On 7 Nov 2019, at 1:56pm, David Raymond wrote:
> Others will correct me if I'm wrong on that.
No correction, but I wanted to add something.
According to the theory of how SQL (not just SQLite, SQL) works, tables have no
order. You
"So, is this behaviour documented/guaranteed somewhere?"
Short version is: Nope. The engine is free to do whatever it wants as long as
it gives the correct result in the end.
Consider a simple
select * from foo where predicate order by non_indexed_field;
Since there is no nice ordering of the
I think you're referring to "The SQLITE_STMT Virtual Table":
https://www.sqlite.org/stmt.html
-Original Message-
From: sqlite-users On Behalf Of x
Sent: Tuesday, November 5, 2019 2:27 PM
To: sqlite-users@mailinglists.sqlite.org
Subject: [sqlite] Find stmt that's stopping a DB from
Looks like you have triggers going on there. You only gave us the table and
index definitions. What are the on delete triggers you have?
-Original Message-
From: sqlite-users On Behalf Of
Thomas Kurz
Sent: Thursday, October 31, 2019 6:54 PM
To: SQLite mailing list
Subject: Re:
It's not gonna account for 88 minutes, but out of curiosity is there a way to
separately report the "delete and commit" time from the "dang this WAL needs to
be checkpointed now" time?
-Original Message-
From: sqlite-users On Behalf Of
Thomas Kurz
Sent: Thursday, October 31, 2019
"Four observations that may (or may not) explain the problem:
- dataset.id declared "unique": useless since the primary key is unique
by definition but it may create an index (not checked). A PK is not
"more unique" if an additional "unique" constraint is declared."
Declaring it as both
"There's a limit, somewhere around ten, I think. Though you can increase it by
explicitly messing with limits and compilation options."
Default is 10, can be raised to 125.
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https://docs.python.org/3.7/library/sqlite3.html#controlling-transactions
"If you specify no isolation_level, a plain BEGIN is used, which is equivalent
to specifying DEFERRED."
I believe the empty string qualifies as "no isolation_level" for this.
-Original Message-
From:
"I just use the default .connect() without specifying isolation_level
explicitly. Then I am in a transaction?"
E, umm, well.
Even regular users may not know the answer to that do to "automatic stuff
behind the scenes" which may have corner cases or maybe bad documentation.
Which is
https://www.sqlite.org/lang_transaction.html
Depending on how they're implementing it, one could argue that they're just
copying the specs for SQLite and saying "if you're not gonna specify it, then
we're not gonna specify it, and we're just gonna let the SQLite library do with
it as it pleases
"https://docs.python.org/2/library/sqlite3.html;
Also, please consider going to Python 3 instead of 2.
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This question could span the entire range of experience level from beginner to
expert.
When you're in a transaction, .commit() says "make everything done in this
transaction on this connection permanent." If there are any crashes or improper
disconnections in the middle of a transaction then
On disk a record basically looks like:
Here are 5 values: value1, value2, value3, value4, value5
If your query is looking for the 6th, 7th or 8th field and the record on the
disk only has 5, then it goes " I guess they should be the default
values for the missing fields." What that means is
Or something like this using the new filter clause from 3.30. As written it
should show it with two decimal points.
(not tested for typos)
select
CITY_TXT as CITY,
round(100.0 * total(Employee_Count) filter (where MODE_TXT = 'WALKING') /
total(Employee_Count), 2) as WALKING,
round(100.0 *
What language/library are you using?
In Python for example there's .fetchone() to get just the next result row,
.fetchmany(n) to get the next n rows, or .fetchall() to go get them all.
In general though at its core SQLite will get and return one row at a time.
Though if there's grouping or
"Keith, what if one has a peanut allergy?"
Well, the maid dutifully logs the changes she makes to the tin, so that in the
event of an anaphylactic crash the tin can be returned to its original state.
This helps ensure we have ACID peanuts.
___
Without more info it's impossible to say.
The immediate possibility coming to mind would be if you're running in WAL
mode, and that happened to be the commit that triggered a checkpoint, meaning
you have both the commit time and the checkpoint time in there. Depending on
how much there was to
SQLephantine
-Original Message-
From: sqlite-users On Behalf Of
Ned Fleming
Sent: Thursday, October 10, 2019 2:55 PM
To: sqlite-users@mailinglists.sqlite.org
Subject: Re: [sqlite] Opposite of SQLite
> Someone asked:
>
>>> What the opposite of "Lite”?
>
SQLessLite
--
Ned
Looks good.
One request that popped to mind while looking at this: Would you expand the
documentation on the index_info and index_xinfo pragmas to include what they
return when run on an expression index?
-Original Message-
From: sqlite-users On Behalf Of
Richard Hipp
Sent:
It is comma then table-constraint. Check the direction of the arrow on that
loop. You go past it on the main line, go down into the ,-circle, then follow
the arrow left into the table-constraint box, then continue the loop clockwise
to meet back up with the main line.
-Original
If you run a query that returns no results, then cursor.fetchone() will return
None, or cursor.fetchall() will return an empty list. If there is an error
during the processing then some sort of exception should be raised.
-Original Message-
From: sqlite-users On Behalf Of
Rob Sciuk
> If you delete the database file then make sure you also delete any other
> files that might have been associated with it, such as left over journals
> and so forth.
I never see those extra files in practice. Are they guaranteed to be
deleted automatically once an SQLite session is finished?
Kind of annoying that when the author shows a screenshot of the sample data
he's using for his queries that he doesn't include 2 of the fields that are in
the queries. Makes it harder to "play along at home"
For their ntile example (on page2) I don't think I've seen a window function
used with
When you run ".open test.db" if the database doesn't already exist, then the
file is created. However *no data is written yet* as there are a few permanent
things you could change at the very start (like page size, encoding, etc), so
it holds off on writing the first page with the header until
Running sqlite3 will open up an in-memory database to start with.
".open test" will either open the file "test" if it exists, or create the file
if it doesn't. You will then be working on that file called "test" which is
your database.
The help line for .save is:
.save FILE Write
Sorry if my mind is working slowly today, but why are those showing up as a
difference when they're exactly the same line?
The only difference between both runs:
> $ diff run1 run2
> 1260d1259
> < INSERT INTO space_used
>
It does support natural joins.
USING needs parenthesis around the column list: ...using (author_id)...using
(book_isbn)...
-Original Message-
From: sqlite-users On Behalf Of
Dominique Devienne
Sent: Tuesday, August 27, 2019 10:08 AM
To: SQLite mailing list
Subject: Re: [sqlite]
The basic query is going to be the below
select stuff
from
books
inner join author_books
on author_books.book_isbn = books.book_isbn
inner join author
on author_books.author_id = author.author_id
where things;
-Original Message-
From: sqlite-users On Behalf Of
dboland9
I don't know how smart the planner is, but as a thought, would UNION ALL make
any improvement over just UNION? With just UNION it has to de-duplicate all the
subquery results whereas with UNION ALL it would be free to separate all the
various subqueries from each other.
Or do you actually need
Your create view had 2 typos in it by the way. Here's a fixed version for those
copying and pasting:
CREATE VIEW select_file_dirs AS
SELECT dir_paths.dir_path AS dir_path,
files.f_name
FROM dir_paths
INNER JOIN
files ON files.dir_id = dir_paths.id;
>> A connection holds a SHARED lock. It did start a DEFERRED transaction then
>> read something. Now it executes COMMIT.
>You are one of the rollback journaling modes, not WAL mode, right?
>Different rules apply for WAL mode.
>
>In rollback mode, the connection automatically promotes to EXCLUSIVE
>"But you do need WAL to achieve multiple readers concurrency..."
Nope, you can have concurrent readers with rollback journal mode. You just
can't have anyone writing while they're all reading.
(Or I may just be misunderstanding what you meant)
___
https://www.sqlite.org/fileformat2.html
is the page with the nitty gritty for the file format.
Overflow pages are stored in a singly linked list of pages, so you have to
traverse through all of the pages to get to the end. So while you may know
right away that you want the 20th overflow page
Not that I'm aware of no. How much of a difference are you seeing for your
database size depending on the page size you try?
-Original Message-
From: sqlite-users On Behalf Of
Tony Papadimitriou
Sent: Wednesday, July 31, 2019 3:29 PM
To: General Discussion of SQLite Database
Subject:
t or after it.
-Original Message-
From: sqlite-users On Behalf Of
test user
Sent: Tuesday, July 30, 2019 3:01 PM
To: SQLite mailing list
Subject: Re: [sqlite] Explicit "read transaction" with journal_mode=WAL.
Thanks David,
`SELECT 1` = rows 0 was a mistake in the exa
To get the read lock you're going to need to read something from the database
file.
I think this page is your best bet: https://www.sqlite.org/lang_transaction.html
"Transactions can be deferred, immediate, or exclusive. The default transaction
behavior is deferred. Deferred means that no
Well, yes and no. I see that as more of a generic question of "why is some
rogue process accessing and changing your database?" rather than a problem
specific to SQLite. If your data needs foreign keys, or some extension like
FTS, R-Tree, etc. then you're going to be controlling what's
"integer primary key"s cannot contain a null since they're an alias for the
rowid. So when you insert a null into them they act similar to autoincrement
and automatically fill it in with an unused id. (Current implementation is 1
more than the _current_ highest rowid. Subject to change)
If you
The questions coming to mind at the moment:
What is the schema of the table holding the BLOBs?
What is the normal size for the blobs?
How are you doing the inserts and deletes?
What journal mode are you using?
I would think normal way to delete a record is the simple
delete from blob_table
Other small ones from the Quirks page:
Section 2:
"to realize the SQLite is not intended as"
to realize [that] SQLite is not intended as
Section 3.2:
"SQLite as no DATETIME datatype."
SQLite [has] no DATETIME datatype
Section 5:
"Due to an historical oversight"
Due to [a] historical
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