Rense,
As for the ranges of n1 and n1: they are both roughly between 6
and 1200 .
Here are the results of EXPLAIN QUERY PLAN SELECT n1, n2 FROM table1
Where n1 n2 INTERSECT SELECT n2, n1 FROM table1 Where n2 n1;
1|0|0|SCAN TABLE table1 (~437976176 rows)
2|0|0|SCAN TABLE table1
Hi Rense,
Thanks for this idea. In fact, the purpose of my original query is
exactly to reduce the database. The 800 mln rows were exported from
another source, and I was hoping to be able to use sqlite to manage
this massive amount of data (e.g., removing redundant information)
before I proceed
I've run into a phenomenon I don't understand where view nesting affects
types.
Give me a try:
Form what I understand, views don't have their own types, so default
affinity applies. 12.0 gets converted to 12 as an integer in v2 when
the value gets picked from v1.
Please someone correct me
Kevin,
I have confirmed that the DELETE does indeed delete the record, but
only after Django's delete callback has completed. If what you say is
true, that DELETEs are proceed immediately, then the only other
explanation is that Django, upon sending of the post_delete signal,
has not actually
As was being discussed yesterday, I have four processes accessing the
same database file. When they perform an sqlite action, I wish them to
block if the DB is not available. SQLite does not block if it finds the
db busy or locked, it returns an error code.
You can have SQLite do all this by
Hi Jay,
Invoke sqlite3_busy_timeout() with a safe timeout for every connection
to the DB.
Use IMMEDIATE transactions everywhere.
That's all you have to do.
Well, yes and no. You still have to deal with the case of
SQLITE_BUSY being returned due to deadlocks. Setting a timeout
Thanks. I was prepared to receive alternate suggestions :)
I wanted to have hands on and control over a browser with which
can follow sqlite versions quicker.
Sqlitebrowsers tend to lag behind the Sqlite development.
Then give SQLite Expert a try!
http://www.sqliteexpert.com/
Sure, if you're just computing average() then you'll not get any NaNs.
NaNs, NO (if we don't have NaNs in the set) but issues, YES. It all
depends. No one knows. You don't even know what you're computing exactly.
SQL interpret avg() as take this data as a set, sum up these numerical
values
What is the official way to escape table name that contains a space
and column name that contain a spaces?
You can use square brakets or double-quotes:
[This is a long name for a small table]
This is a long name for a small table as well
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Allow me to add a humble bit to what Jay just posted.
SQLite, as well as most other RDBMS around, allow you to perform FP
calculations in SQL statements. I assume no-one imagines an extended
FP fine-grain support of hundreds of computation options and status
reporting be part of SQL or
Nico,
There is one thing that makes numerical support in RDBMSes important:
aggregate functions.
Aggregate functions are critical because they allow one to do much
analysis at the data source, instead of having to transport it
elsewhere for analysis.
I agree with you, totally. Read me again: I
Quoth Roger Binns rog...@rogerbinns.com, on 2011-06-01 00:21:44 -0700:
On 05/31/2011 12:18 PM, Jan Hudec wrote:
- Is there any way to speed it up?
Another way (somewhat hinted at by Nico) is that you can create
these tables
in separate databases and use attach to bring them in. To
I understand the need for integrity when locking a database, but in
this case I knew that the problem was caused by a (in all honesty, my)
bug. I tried rebooting the machine and it did not unlock the table.
Yeah, sometimes Windows will keep a lock on a file beyond reboot, which
is something
Simon Slavin, Thank you for your suggestion. Our deduper prototoype
uses fuzzy matching methods such as the Levenshtein Distance to
detect duplicates. We have found that these fuzzy matching methods
are best implemented in C++ for processing time requirements.
We would
Richard,
At 13:07 25/05/2011, you wrote:
It turns out that the expected behavior does not happen in modern C
compilers. Overflow of signed integers is undefined behavior in C. So if
you have a signed integer overflow, it might wrap the result (the
expected
result) or it might segfault, or it
I have problems with column aliasing using AS when I select
rows with the same string:
.headers ON
CREATE TABLE TEST1 (name TEXT,value TEXT);
INSERT INTO TEST1 VALUES (name1,value1);
SELECT value AS name1 FROM TEST1 WHERE name=name1; // gives no result
SELECT value AS name1_ FROM TEST1 WHERE
I resolved with:
CREATE TRIGGER insert_nameTable after insert on
name_tabl begin
update set ww = datetime('now','localtime')
where rowid = new.rowid; end
You don't have to fire a trigger for such default:
CREATE TABLE test (
mydate CHAR DEFAULT
Ah, there is a way to write it so that you can have at most one of
those constraints where only one makes sense, and not require a
specific order of constraints, but it'd require listing all the
possible orderings, which would be impractical.
So if one wanted to enforce that there's at most one
On Wed, May 18, 2011 at 4:10 PM, Petite Abeille
petite.abei...@gmail.com wrote:
On May 18, 2011, at 10:50 PM, Danilo Cicerone wrote:
How can I simulate a
calendar table(maybe using the strftime funtion)?
Well, you have two broad options:
(1) materialize the calendar as a table
(2)
Since we use recursive triggers, set recursive_triggers pragma
beforehand if not yet done.
Cunning. A bit of a Rube Goldberg apparatus though, no?
Huh? Still way more flexible than having to modify C source of a vtable
module, should you have to adapt anything.
Yeah, it's kind of
Let me ask this by mere curiosity.
SQLite will accept and process the following:
CREATE TABLE x (a CHAR PRIMARY KEY);
CREATE TABLE y (a CHAR PRIMARY KEY);
CREATE TABLE z (a CHAR REFERENCES x(a) REFERENCES y(a));
I didn't check if the last FK is even valid normative SQL and that
isn't the heart
Anoher (silly) question about what SQLite considers valid input, again
out of mere curiosity.
A statement like:
CREATE TABLE a (a CHAR COLLATE NOCASE COLLATE BINARY, b INTEGER DEFAULT
1 DEFAULT 2);
doesn't cause any error: SQLite applies only the last constraint of
each type, namely COLLATE
Dear list,
Is there a way to make SQLite accept this kind of constraint:
CREATE TABLE tab (
id INTEGER NOT NULL,
data INTEGER,
CHECK(data = 0 or not exists (select 1 from tab where id = data)));
This toy exemple doesn't mean much as it is and the actual situation is
a bit more
I agree with what you stated but it would have been more clearer if
the result of the update statement was a RECORD NOT FOUND return
value since it did not find any that met the query's criteria. How can
you say that the UPDATE was successful when the record you were
looking for does not even
Without a view (but with a trigger) and certainly open to improvement
(9 is the
MAX_ENTRIES parameter):
CREATE TABLE log (
id INTEGER NOT NULL PRIMARY KEY ON CONFLICT REPLACE AUTOINCREMENT,
seq INTEGER CONSTRAINT ix1Seq UNIQUE ON CONFLICT REPLACE,
data CHAR);
CREATE TRIGGER trInsLog
Change that into:
select date('2011-04-29', quote(-3) || ' day');
(note the space before day).
Looks like a parsing change.
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How does one go about finding out how many rows a query returns?
This is the number of time sqlite3_step can be called successfully
until it returns SQLITE_DONE.
Is there a way to find out the id of a particular column?
AFAICT column don't have ids. You can read column names or alias using
How about:
SELECT count() FROM (original queryâs SELECT statement);
You can do that (and variations) but this is a completely distinct
statement.
I meant that there is no possibility to recover the row count of a
result set before it goes to completion (by iterating step), just
because
I happen to have a code path such that the select statement can return
1, 3
or 5 columns. I know I could go based on count, but if I could do it by
name that would be safer. I had not considered the point that multiple
columns could have the same name, though, so I fully understand why such a
I apologize if double-post, the first one didn't make it to the list.
-
Hi,
Hi all, I am interested in seeing fuzzy searching in SQLite, for
lack of a better term. This type of search would return more results
than LIKE
The apostrophes are escaped by apostrophes.
Correct. http://www.sqlite.org/faq.html#q14
One more way you can do.
insert into table name (column name) values (*Goin' Down
the Road Feelin' Bad*);
It is double quotes before and after *. Similarly double quotes will
be escaped by one more
True. I will get rid of the habit of using double quotes for string
literals.
Thanks for information. But most of the databases support this non
standard
behavior.
Yeah ... until things break under your feet due to a new version not
sticking to the non-standard behavior anymore or parser
Newbie here. i'm trying to insert multiple values into a table by a
certain
date and when I use where clause it fails. This is my code insert
into db
(table) values ('value') where date = 'date range'. Thanks for any help.
There is no where clause in insert statements, it wouldn't make
My date column is set when the program starts and i do not want it to
change.
How is this date column set in the database without inserting anything?
So I have my dbname with mytable and two columns date and
value column. I have say 5 values (1 2 3 4 5) that I wanted inserted
into mytable
It's impossible when you use standard sqlite3 command line utility. In
your particular case you have 2 options: either write your own
application that will recognize some kind of value as null and insert
it instead of plain text, or you can use temporary table like this:
Another way is to use
3. edit the database file with a hex editor, replacing ~~ with 0D 0A.
That seems pretty dangerous! Rather update the table using the
standard replace() function.
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It's a pain in the arse that one has to pay for copies of the
ISOs. What do they think we're paying them for ?
I also find this a perverse effect totally contrary to their mission or
at least its spirit: produce good standards for public use. Without
free access to reference up-to-date
There are many cases where people are doing calculations or using
numbers expecting them to retain all digits. This would allow the BCD
type to be used for that if they really need it.
Currency conversions (rarely exact!) or tax (or margin) calculations
come to mind as very common uses
This page has a lot of info about
Decimal Number support, including
a set of libraries:
http://speleotrove.com/decimal/
Yes! IBM and Intel are two of the big names having done significant
work in this direction and made research and/or results publicly available.
At 09:43 23/03/2011, you wrote:
I am working on one application which require sorting for Korean Language.
The Korean Characters sort by Jamo(Hangul Jamo) ie based on KSX1001
character code.
Does sqlite3 or any other package support this type of sorting ?
If not , then any clue to carry out
At 18:46 23/03/2011, you wrote:
Current US national debt is 16 digits.
Nothing less? That's where the bug lies.
OK, OK, I'm out ;-)
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Hi Dear list,
I'm looking into system.data.sqlite and I've been asking myself
questions about the most portable encoding of a text passphrase to
sqlite_[re]key.
It seems to me that the only portable way is to pass an UTF-8 string
since it's the only encoding invariant wrt byte order and
So if the drive is 5400 rpm, 227 is much more than 5400/60=90 and even if
it's 7200 (manufacturers sometimes upgrade drives inside portable hd
without
prior notice), it's still twice as much as 7200/60=120.
5400/60, 7200/60 ... those values rely on the assumption that
successive LBAs are
But what I postulate is that you can't physically write *the same* record
over and over more than 90 times per second on a 5400 rpm drive,
unless the
drive, OS, or filesystem implements something like wear-leveling,
where the
physical location of sectors is constantly changing.
It's still
Your goals make a lot of sense. However I think you can do my second
suggestion. Compile with STAT2 code included by default, but make the
analyze command only build stat1 by default.
This will result in no change in default behaviour, but means that anyone
wanting to use stat2 can easily do
Could you please show me how to write the condition (to filter out
characters)?
Use the strfilter function found in extension-functions.c downloadable
from http://www.sqlite.org/contrib/
Once built and loaded, you can use a trigger similar to
create trigger if not exists trFilterAB after
It seemed strange that a simple select * from table that I was doing
was so slow. The table contained about 20 columns (fields) and 300
rows. The select took about 1.5 seconds. (using SQLite Expert).
Does the run time settle at 1.5 s after a few runs or is that a
first-run time ?
As an aside
Sorry for elementary questions but when implementing a REGEXP function
(I'm using PCRE from pcre.org) I need to know in which order the two
arguments (target, pattern) will be passed to the function.
I also would like to retain the last pattern used in compiled form
(connection-wise).
Hi Igor,
I'm not quite sure what you are talking about, but see the
documentation of like() and glob() functions here:
You're right about LIKE and GLOB.
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Hi all,
Sorry for elementary questions but when implementing a REGEXP function
(I'm using PCRE from pcre.org) I need to know in which order the two
arguments (target, pattern) will be passed to the function.
I also would like to retain the last pattern used in compiled form
(connection-wise).
when i just launch th application, at the beginning the query can take
around fews seconds... but after some time (10 - 20 minutes), it's take
only few ms !
so i guess it's because the windows cache in memory the database file ?
so how to speed up this time to make windows cache more fastly in
This is, technically, a compatibility break. On the other hand, there
appear to be vast numbers of smartphone applications that currently depend
on undefined behavior and will suddenly stop working if we don't make this
change.
I understand the proposed change will have no incidence for
An end user (think: your mom) wants to upgrade her smartphone to the
latest
OS release. That new OS release includes the latest shared library for
SQLite. But in so doing, some percentage of the apps she has downloaded
cease to work. Sure, the problem really is that the apps were incorrectly
thanks Simon and Igor for your help on this a few weeks ago, but I
need an
addition to
UPDATE Aircraft SET CN = '*' where CN = '' or CN is null;
what I need to do is replace blank fields in a specific row, sort of
a double where where statement as in:
UPDATE Aircraft SET CN = '*' where CN =
select round(3.05, 1)
3.0
Is this expected behavior for SQLite?
The documentation isn't specific on the rounding strategy that is used.
My personal expectation was that this would round to 3.1.
You _expect_ that 3.05 will represent exactly as 3.05 in IEEE, but it
that the case? Should the
Scott,
SQLite handles rounding by running the value through the internal
printf with the appropriate precision. As best I can tell the
internal printf adds half a unit at the appropriate position, then
truncates.
Yep, truncation is a way to do it but doesn't meet layman expectations
in many
Hi,
SQLite sounds pretty reasonnable to me:
select select distinct favicon_id from moz_places;
select distinct favicon_id from moz_places;
Returns NULL
select deleting: standard method...;
delete from moz_favicons where id not in (select distinct favicon_id
from moz_places); -- here is the
Harish,
We have a problem with a sql query.
In a table, a column called name contains character data that may
include
alpha, numeric and special characters. It is required to sort in such
a way
that names starting with alpha characters are listed first, then numerals
and finally special
Pavel,
1) How expensive is a call to sqlite3_open. Does a call to
sqlite3_enable_shared_cache make it cheaper?
Its cost depends on the size of your schema as it gets parsed during
open.
Isn't this contradictory with an answer by Igor made in a recent thread?
Subject: Re: [sqlite]
It's not contradictory. I say that real cost of sqlite3_open is
parsing the schema. Igor says that this cost is actually deferred from
inside sqlite3_open call to the first substantive sqlite3_step call.
So you will have to pay this price anyway, just profiler output would
be somewhat confusing.
At 14:26 26/11/2010, you wrote:
N.b., there is a severe bug (pointers calculated based on truncated
16-bit
values above plane-0) in a popular Unicode-properties SQLite extension.
The extension only attempts covering a few high-plane charactersif
memory
serves, three of thhem in array 198; but
Simon, I'll try that and see what difference itmakes
That or build a :memory: DB, populate it, build indices and then only
back it up to disk using the backup API. That requires you have enough
memory available, but should be really fast if you have.
I import a CSV flat file into a table (using sqliteman as GUI). The
flat file has NULL values as simply no data between two delimiters (I
use 'tab' as Delimiter).
The resulting table does not treat 'no data' between 2 delimiters as
NULL. When I run CHECK constraints etc. on it it behaves as
Look in your mailbox.
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As far as I can tell, turning on foreign_keys for a database is not
persistent. It only seems to be valid for that connection/session. So
this means I have to prefix every command that I send to the database
with a command to turn on foreign_keys and I therefore can't issue
one-off commands,
But Roger, the layer sitting in front of SQLite is a programming
environment which provides its own (black-box) connectivity to SQLite, and
it isn't going to be calling any DLL into which one will have injected
a UDF
library in the manner you have laid out, and it's not going to let the
What is the rationale about placing complex conditions in the ON part
of an inner join rather than in an WHERE clause?
I understand that the ON clause will limit the temporary table
processed by a subsequent WHERE clause, while a larger table will be
filtered by the WHERE part if no selective
What is the rationale about placing complex conditions in the ON part
of an inner join rather than in an WHERE clause?
Except for outer joins, the difference is purely stylistic. They are
functionally equivalent. In fact, SQLite internally rewrites the
former to the latter, before
allow.
--
Jean-Christophe Deschamps
eMail: mailto:j...@q-e-d.orgj...@q-e-d.org
SnailsTo: 1308, route du Vicot
40230 Saint Jean de Marsacq
France
GSM: +33 (0)6 15 10 19 29
Home:+33 (0)5 58 77 71 79
I'm aware that SQLite offers the functionality of in-memory databases,
but I
don't know how to read the data and send it over the wire to the server or
how to push the data into the in-memory database of the server.
The backup API included in SQLite offers the facility to backup/restore
(in
I am parsing fields on the fly and then creating tables, unfortunately
one of the fields is Order and is a special word in SQL as is not
allowed. Is there a way around this instead of intercepting with perl
s'/Order/Orders/g'
Can you wrap every column name inside double quotes or square
What's the best way to copy data from one db to another?
Given 2 databases with identical schemas, one full of data and the
other empty, the brute force way would be to perform selects on the
source db, then for each row, perform an insert into the destination
db. Is there a more efficient way?
How do I search for the asterix character * ??
This doesn't work:
select field1 from table1 where field1 like '%FH%*%'
as the * character here seems to be ignored.
Using the latest version of SQLite.
You're doing it right. Either you use a wrapper that messes with * in
litterals or there is
I use vb or in SQLlite Expert the * does not seem to work
From my testing * doesn't seem to work in the likeif I use '%33' it
returns
everything with test33if I use '33%' it returns everything with
33testif I
use '%33%' it returns everything with 33test, test33 which is the same as
*
I can't
Running in sqlite application in Virtual Box, attempt to open a
database with sqlite from a shared network folder
\\Vboxsvr\testdata however the open16 and openv2 (with read
only) both fail --- rc = 14. File opens file if moved locally to
hard drive.
using latest version of sqlite3
I use sqlite from within Autoit V3 (Autoit is a windows-oriented
basic-like language)
AutoIt, while a scripting language can be seen and used as a RAD
platform. It enjoys good support, up to date SQLite embedding and
executables produced can include any file your application needs, like
a
Is there any way to load a sqlite3 db from a location in memory?
Ideally, I'd like to have a memory pointer (eg, something provided via
malloc), which I could then use as the handle sqlite3 uses to load the
database.
The reason I'm trying to do this: I have an encrypted database file
that I
z i wonder is there RECURSIVE select function in sqlite? the background
z for the question are: create table objects (id INTEGER PRIMARY KEY
z AUTOINCREMENT, name text unique) create table tree(id int, child_id
z int, PRIMARY KEY(id, child_id)) i want to draw the whole tree, is
there
z good
Let me take a reality check for the case of my own usage. If I
guarantee that the following conditions are all true:
All R^n (Read-Read-...-Read) atomic operations are enclosed in BEGIN
transactions.
All W^n (Write-Write-...-Write) and RMW (Read-Modify-Write) atomic
operations are enclosed
In my low-concurrency, familly-business context, I have no problem at
all setting 3 hours timeout using the built-in function, when the
slowest transaction may only take less than 5 minutes.
With this condition as a 4th one in your list and with 5th one stating
that you have less than 30
The Minimal-Perfect-Hash-INTERSECTION-OF-VECTORS approach might benefit
queries against tables having several million rows. What I'm wondering
(and
lack the C skills to find out for myself) is whether SQLite's underlying
algorithms for INTERSECT could be optimized with a minimal perfect hash
I would first create an INTEGER primary key and then place an index on
name,
another on i_from, and another on i_to, and then see if the approach below
has any benefit.
When I tried this with a geo-queryit was actually slower than the standard
select, and I'm curious if that's always going to
I need to find out how many specific weekdays (e.g., how many Sundays)
I have in any given range of dates.
My problem: How to use the COUNT function in combination with the
strftime() function.
$ sqlite3 test.db3
SQLite version 3.6.20
sqlite create table test (date VARCHAR(20), money INTEGER);
Tim,
But did I say that GLOB uses an index if it has been overloaded? No. I
wrote that if LIKE has been overloaded, queries that contain LIKE
won't use
the index. Typically, GLOB won't have been overridden too just
because LIKE
has been overridden: the rationale for overriding the LIKE
Hi gurus,
I'm aware of the limitations that generally preclude using SQLite over
a network.
Anyway do you think that doing so with every read or write operation
wrapped inside an explicit exclusive transaction can be a safe way to
run a DB for a group of 10 people under low load (typically 2Kb
At 14:31 26/04/2010, you wrote:
If the implementation of SQLite you are using overrides the LIKE operator
(as more than a few do), then SQLite will not make use of an index on the
column in question. Use the GLOB operator instead.
I doubt it. GLOB is absolutely nothing more or less than an
Tim,
Queries using GLOB do use the index on the column in question (i.e.
optimization is attempted)
Queries using LIKE do not use that index if the LIKE operator has been
overridden.
Sorry but GLOB doesn't use an index either if LIKE/GLOB has been
overloaded. This is consistent with the docs
I found the the restriction of updating unique column in ver3.6.21.
and same problem is reported in follwoing mail
Marc-Andre Gosselin wrote:
date: Thu, 16 Jun 2005
title: [sqlite] Update unique column
I discovered a behavior in SQLite 2.8.16 that doesn't conform to
the SQL
standard,
Contrary to what occurs in other engines, SQLite seems to
assert constraints at insert/delete time, ignoring the fact that
(insert or delete) trigger will increment or decrement the upper part
of the tree interval on HI and LO keys (in the case of a nested tree).
This /should/ be handled
We just experienced the hard way that overloading certain built-in SQL
function can interfere with core SQL commands if the overloaded function
behaves differently from the built-in function.
Not surprising, after looking at the sources:
* ALTER TABLE - alter.c uses SUBSTR and LIKE.
* VACUUM
Both of these tools show a version of the database that is different
from what i see in the command line and they are equivalent in their
discrepancies (they are different from the command line but the same
as each other).
So heres the basica scenario:
1. i update my database with the code i
Hi Tom,
BTW- if you haven't done so already; it may be of use to the user to add
extensions: VirtualText and Jean-Christophe Deschamps has an extension
for fuzzy search for example.
There is no problem. Alexey put it on his website under the extension
for Unicode folder. Please drop me a mail
I have a (small) directed graph which I would be able to fins all
ancestors or descendents of a certain vertex (transitive closure?).
So, using this graph:
CREATE TABLE levels_levels (parent_id INTEGER ,child_id INTEGER,
UNIQUE(parent_id, child_id));
INSERT INTO levels_levels VALUES(6,7);
INSERT
Is it allowable/safe to invoke more than once any sqlite3_result_*()
function? In other terms, subsequent invokation of any result function
will it harmlessly override a previous one?
As in:
init...
// once for all, post null return in anticipation for the various cases
where
// parameters
We currently use sqlite 3.6.23. We have a big problem with characters with
accents or other special characters in path to database file, for
example in
Czech Windows XP the Application Data folder is translated to Data
aplikací so if the accented 'í' is in path the sqlite3.exe writes that it
is
is anybody aware of a possibility to do s.th. like
select * from table where field like '[A|a]%'
Unless non-standard compile option and provided you don't issue
PRAGMA case_sensitive_like = 1;
LIKE is case-insensitive, so LIKE 'A%' is the same as LIKE 'a%'
SQLite offers another filtering
Andrea Galeazzi wrote:
I've got a table T made up of only two fields: INT id (PRIMARY KEY) and
INT length.
I need a statement in order to yield 0 when the key doesn't exist.
Well, select 0; fits your spec (you never said what should be
returned when the key does exist). I would hazard a
Yours returns 1 or 0. Mine returns length if found, otherwise 0.
That's true but the subject title led me to believe that the OP
intended to have a 0 vs. nonzero return for not-exists vs exists condition.
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And, of course, you'll have a table where some rows (old ones) contain
integers and others (new ones) contain text. SQLite is fine with this,
but your client software might not be prepared to deal with it. Some
comparisons might behave in surprising ways.
I imagine that in such case, the best
Why not just
update tbl set col1 = col1;
or perhaps
update tbl set col1 = cast(col1 as text);
I'm not sure the former will actually change anything, but the latter
should.
Yes my untold question was merely if simpler col = col way could be
simply ignored. You're right about the
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