Maybe adding "order by rowid" to your select statement can help avoid "sawing
off the branch you are sitting on". Unless you need to update rowids...
-Ursprüngliche Nachricht-
Von: sqlite-users [mailto:sqlite-users-boun...@mailinglists.sqlite.org] Im
Auftrag von Jens Alfke
Gesendet: Dien
alization in icu.c : sqlite3IcuInit
>
>On Thu, 26 Jan 2017 08:19:02 +
>Hick Gunter wrote:
>
>> On LP_64 architactures, the integer 0 is 32 bits while (void *)0 is
>> 64 bits, which makes more than a bit of a difference. A 64 bit integer
>> 0 would be denoted by 0L.
>
&
The constant '1' (of storage class TEXT) has no affinity, neither has the
constant 1 (of storage class INTEGER), nor the result of an expression - with
documented exceptions, notably CAST( AS ).
Consider:
1 = '1'
---
0
(1=1) = '1'
---
0
cast((1=1) as integer) = '1'
---
reff: Re: [sqlite] BUG: Illegal initialization in icu.c : sqlite3IcuInit
Hick Gunter wrote:
> On ILP_32 architectures, the integer 0
What integer 0? The message is about initializing scalars[11].pContent (a
"void*") with "(void*)db", which is "sqlite3*".
> Oh? What ex
On ILP_32 architectures, the integer 0 is not discernible from the (void *)0
(aka NULL) and so most compilers don't bother to issue a warning. This comes
from an age where programmers were expected to know how computers work on an
assembly language level and would "know what they are doing" when
--
Von: sqlite-users [mailto:sqlite-users-boun...@mailinglists.sqlite.org] Im
Auftrag von Simon Slavin
Gesendet: Montag, 16. Jänner 2017 13:30
An: SQLite mailing list
Betreff: Re: [sqlite] Feature request
On 16 Jan 2017, at 12:17pm, Hick Gunter wrote:
> Please be aware that %V implies %G/%g
Please be aware that %V implies %G/%g (four and two digit ISO Year number),
which differs from %Y/%y on the "spillover days" that belong to the first/last
week of the "other" year.
-Ursprüngliche Nachricht-
Von: sqlite-users [mailto:sqlite-users-boun...@mailinglists.sqlite.org] Im
Auftr
There are a couple more cases of Tcl_AppendResults( ..., 0) in tclsqlite.c
Unfortunately, Tcl_AppendResults() is defined as having varargs and thus
lacking type checking.
I would prefer NULL over (char*)0 anyway, which BTW is also present at least
once in tclsqlite.c
-Ursprüngliche Nachric
I must disagree. SQL is based on sets. Sets do not have any order, even if the
elements of the set (e.g. cardinal numbers) suggest a "natural" order (which
may not be the same for all jurisdictions). An ordered set is called a
permutation. Operations on sets (should) yield identical results, reg
Since you did not specify an ORDER BY clause, SQLite is free to return rows in
*any* order. The order may even change if the underlying schema changes and
SQLite finds a better way to compute the results.
A "covering index" is one that contains all the fields required from a certain
table to fu
What is the result if you exchange your currently executed statement to "SELECT
1,0;" ? Or to "SELECT 1, cast(0 as real)"?
The effect of declaring a NUMERIC(5,5) field in SQLite is that it's affinity
becomes NUMERIC. The value .0 thus becomes the integer 0. The other legal
values (.1 to
Incorrect. All data is stored as NULL, integer, float, text or blob. The
"declared type" is taken as a hint from the designer in respect to the kind of
values he intends to store there. The result of the hint is called an
"affinity", i.e. the kind of data the field "likes to" store. If the type
The functions sqlite3_sql() and sqlite3_expanded_sql() will return the original
and expanded (i.e. with the bound values insted of parameter names) SQL strings
for a statement created with the sqlite3_prepare_V2() interface.
-Ursprüngliche Nachricht-
Von: sqlite-users [mailto:sqlite-user
According to sqlite 3.7.14 code the equivalences are SorterInsert == IdxInsert,
SorterSort == Sort and SorterNext == Next
case OP_SorterInsert: /* in2 */
#ifdef SQLITE_OMIT_MERGE_SORT
pOp->opcode = OP_IdxInsert;
#endif
case OP_IdxInsert: {/* in2 */
case OP_SorterNext:/* jump
The value obtained from sqlite3_column_blob() is valid only after
sqlite3_step() returned SQLITE_ROW and will - at the very latest - go out of
scope the moment the queries' idea of "current row" changes, i.e. one of
sqlite3_step(), sqlite3_reset() or sqlite3_finalize() is called.
It may also ch
Perhaps you should change your calling sequence so that you call
sqlite3_next_stmt() BEFORE sqlite3_close()? If you exclusively use
sqlte3_prepare_v2() you can retrieve the text of the unfinalized statement(s),
print/log that, and maybe even call sqlite3_finalize() if you like.
-Ursprünglic
xRowid() is only called if the (hidden field) rowid is explicitly mentioned in
the select list, join condition or where clause(s) of a SELECT statement; or if
your VTAB supports write operations (see xUpdate documentation
http://www.sqlite.org/vtab.html#the_xupdate_method ).
-Ursprüngliche
>On 12/13/2016 01:47 AM, Bob Friesenhahn wrote:
>> I am reworking code for a virtual table module and need to provide
>> proper error codes from the xColumn() and xRowid() callbacks for the
>> case where the row id does not exist, or the current row goes away.
>> This problem occurs because the cur
Current documentation http://www.sqlite.org/rescode.html suggests you return
(267) SQLITE_CORRUPT_VTAB in this case. Other candidates would be SQLITE_IOERR
or SQLITE_NOTFOUND.
You may also call one or more of the sqlite_result_error() functions to set an
error string and/or an error code; curre
Select AddOne( );
-Ursprüngliche Nachricht-
Von: sqlite-users [mailto:sqlite-users-boun...@mailinglists.sqlite.org] Im
Auftrag von Bart Smissaert
Gesendet: Sonntag, 11. Dezember 2016 22:39
An: General Discussion of SQLite Database
Betreff: [sqlite] Run non-data producing statement just
>1) SELECT * FROM TEST WHERE posted = 1;
>[(‘inv’, 100, 1)]
>
>2) SELECT * FROM TEST WHERE posted = ‘1’;
>[(‘inv’, 100, 1)]
>
>3) SELECT * FROM TEST WHERE CASE WHEN tran_type = ‘inv’ THEN posted END = 1;
>[(‘inv’, 100, 1)]
>
>4) SELECT * FROM TEST WHERE CASE WHEN tran_type = ‘inv’ THE
Assuming the OPs native language is German:
Lieber Freund, Du hast kein Problem mit der Speicherung sondern mit der
Darstellung der Werte.
MySQL übernimmt aufgrund der Typangabe "decimal(7,4)" die
Darstellung/Formatierung der Werte. Vor dem Speichern wird der Wert so
skaliert, dass immer ganzz
Perhaps you mean ...,"a bc_tag" char(254), PRIMARY KEY ("abc_tnam",
"abc_ownr", "abc_cnam") );
-Ursprüngliche Nachricht-
Von: sqlite-users [mailto:sqlite-users-boun...@mailinglists.sqlite.org] Im
Auftrag von Igor Korot
Gesendet: Dienstag, 22. November 2016 14:46
An: Discussion of SQLite
Maybe you are looking for
SELECT id,baz from foo where exists( select 1 from bar where foo = id) ...
which has the effect of easily extending to an arbitrary number of bar tables
via additional exists subqueries that may be connected by logical operators
-Ursprüngliche Nachricht-
Von: s
On Tuesday, 15 November, 2016 15:30, R Smith wrote:
>
>> On 2016/11/15 10:38 PM, Jens Alfke wrote:
>
>> >> On Nov 15, 2016, at 11:35 AM, Quan Yong Zhai wrote:
>
>> >> Create a custom function MD5 ,
>> > If you’re going to go to this trouble, at least use SHA256!
>> >
>> > MD5 is broken. These days
The virtual table approach works very well for us here. Unfortunately it is all
proprietary code, so I can share only a basic description.
Bottom layer is an abstraction layer that provides an interface to some form of
shared memory (BSD, SysV or Posix or even a memory-mapped file); This provide
_
From: sqlite-users on behalf of
Hick Gunter
Sent: Monday, October 24, 2016 10:39 AM
To: 'SQLite mailing list'
Subject: Re: [sqlite] Virtual table acting as wrapper of a regular table
Your xFilter method is blindly assuming that there is always an argv[0] without
ch
Your xFilter method is blindly assuming that there is always an argv[0] without
checking argc first.
You are incurring an extra "prepare" in your xConnect method, an extra "step"
and "column" in your xFilter/xNext methods and an extra "result" in your
xColumn function. Doing twice as much work
Write a procedural program... ;)
In SQL it requires a triple self join similar to:
Select t1.id from table1 t1, table1 t2, table1 t3 where t2.id=t1.d and t1.value
< t2.value and t2.date = (select min(date) from table1 where id =t.id and date
> t1.date) and t3.id=t2.id and t2.value < t3.value an
16 20:33
An: sqlite-users@mailinglists.sqlite.org
Betreff: Re: [sqlite] Possible Bug in VTable handling in SQLite 3.14.2
On 10/14/2016 04:59 PM, Hick Gunter wrote:
> In the vdbeaux.c source, the function
>
> resolveP2Values(...)
>
> is not resetting p->readOnly when it encounter
Try using the sqlite shell program and the explain feature. You will see that
each column fetched requires an additional opcode to do the fetching and an
additional register to hold the result, all of this on top of requiring SQLite
to decode all of these fields without you ever intending to use
In the vdbeaux.c source, the function
resolveP2Values(...)
is not resetting p->readOnly when it encounters an OP_VUpdate opcode
is not setting p->bIsReader when it encounters an OP_VFilter opcode
Additionally, the frunction
sqlite3VdbeHalt(...)
is only checking p->bIsReader and omitting to c
You can eliminate separators by using
.mode list
.sepa ""
But then you need to format your values to the correct widths for the record
description. Text processing is not the primary domain of SQLite and is best
left to the presentation layer.
Alternatively you may consider writing a virtual ta
(new.value != old.value) or (new.value IS NULL) or (old.value IS NULL)
-Ursprüngliche Nachricht-
Von: sqlite-users [mailto:sqlite-users-boun...@mailinglists.sqlite.org] Im
Auftrag von Daniel Polski
Gesendet: Donnerstag, 13. Oktober 2016 12:03
An: SQLite mailing list
Betreff: Re: [sqlite]
SQLite supports only "forward cursors". You do realize that the example given
is a "stored procedure"...
-Ursprüngliche Nachricht-
Von: sqlite-users [mailto:sqlite-users-boun...@mailinglists.sqlite.org] Im
Auftrag von Igor Korot
Gesendet: Mittwoch, 12. Oktober 2016 18:49
An: SQLite maili
Betreff: *** suspected spam or bulk *** Re: [sqlite] Order of fields for insert
On Thu, Oct 6, 2016 at 9:25 AM, Hick Gunter wrote:
> SQLite compresses rows before storing and decompresses rows before
> returning fields. BLOB fields are the most time consuming to process
> and so should
SQLite compresses rows before storing and decompresses rows before returning
fields. BLOB fields are the most time consuming to process and so should be
placed at the end of the row. Often used fields - i.e. (foreign) key fields -
should be placed at the front of the row. This will help most if
>I am using multiple threads, but in this instance just 2 inside of one
>process. I do not change any PRAGMA settings other than user_version and
>journal_mode. The two >connections differ only by the fact that one is read
>only and one is read-write. It’s possible that I’ve forgotten a fina
SQLite evaluates the WHERE clause from left to right, which means it needs to
evaluate xyz and thereby call json_extract first, even before it can determine
that no rows match the second condition.
Maybe the transformation algorithm can be changed to check the "subselect
constraints" first?
--
>> As already stated, and per my own experience, each thread should have it's
>> own connection and do whatever it needs to do there, without interference
>> from other threads.
>
>I appreciate this point. Early prototyping indicated that this might not be
>possible for our system, which makes me
AFAIK there is no "write mark" in the WAL journal. Instead, each read
transaction (either implicit or explicit) has an associated "read mark" that
determines which data the transaction will see (i.e. the data from the main
file plus any pages in the WAL journal file before the read mark). This i
I guess that selecting from sqlite_master issues an implicit create, and
querying/updateing something from the file header (i.e. several PRAGMAs) would
also imply writing the first page of the file (with the current setting of
page_size) too.
-Ursprüngliche Nachricht-
Von: sqlite-users
This should be computable from the base addresses returned when allocating
successive objects.
-Ursprüngliche Nachricht-
Von: sqlite-users [mailto:sqlite-users-boun...@mailinglists.sqlite.org] Im
Auftrag von Philip Bennefall
Gesendet: Montag, 05. September 2016 08:22
An: General Discuss
It seems that SQLite is no longer honoring the aConstaintUsage[].omit flag for
constraints that do not have an aContraint[].argvIndex set.
This breaks a feature of our virtual table implementation that allows special
hidden columns named in the WHERE clause to be interpreted as hints (i.e. which
Your UPDATE statement does not mean what you think it means.
UPDATE test SET id=0 AND name='new_name' AND age=30 WHERE id=1;
Is parsed as:
UPDATE test SET id = (0 AND name='new_name' AND age=30) WHERE id=1;
The expression (0 AND ...) will always evaluate to 0.
-Ursprüngliche Nachricht
Short answer: YES.
This question crops up regulary.
The SQL Standard mandates only that column names set with AS be reliably
returned. Otherwise each implementation is free to choose whatever name it
deems appropriate, because - by omitting the AS clause - you state that you
"don't care". The
Converting from one SQLite database to another may also be accomplished by
using the ".mode insert " output format of the SQLite shell and
then SELECTING the rows according to the full target schema. This creates SQL
of the form "insert into values (); NOTE: No field
list
Or you can SELECT 'i
Joins against virtual tables are handled in two steps:
1) your xBestIndex function is called (maybe more than once) with an array on
valid constraints the give the "shape" of the requested operation
Each "constraint" consists of a field number and and operation code; no
value is passed.
The conflict action "replace" looks at ALL the PRIMARY KEY and UNIQUE
constraints (express or implied) and deletes ALL the existing rows that prevent
the candidate row from being inserted. As in "I don't care what it takes, I
want THIS row to be in the table."
The other conflict actions just re
The returned column names depend on the exact path taken in the query
optimizer. This may change if the shape of your data changes (analyze is run).
The SQL standard only requires that column references be either unique or
qualified by table.
-Ursprüngliche Nachricht-
Von: sqlite-users-
Creating a trigger causes SQLite to insert a row into the sqlite_master table
which contains the text you supply for the trigger. No code is generated at
this time. You can verify this by creating a trigger that references undefined
fields. It willl succeed. But entering a statement that referen
How many times are you preparing the update statement? Maybe you are just
measuring the effort required to prepare 55000 UPDATE statements.
What is the purpose of counting all the rows of several tables before firing
the trigger? If you are attempting to avoid running UPDATE on an empty table,
I would like to add:
If you have multiple readers sharing a connection and they share the same
prepared statement, none of them can be expected to receive the full result
set, nor can it be guaranteed that the fields values retrieved will belong to
the same row of the result set. A prepared sta
Do not use SQLite for concurrent access over a network connection. Locking
semantics are broken for most network filesystems, so you will have corruption
issues that are no fault of SQLite. If your application requires concurrent
network access, you should be using either a network client/server
SQLite is already telling you that whatever statement contains line 13 of your
input file test44.sql is attempting to evaluate a function named log_file_check
which is unknown to SQLite. Additionally, the correct command for exiting a
SQLite shell is ".exit" and not "exit" alone.
Interfacing wi
You need to redirect "standard error" to "standard output". In linux/bash this
is achieved by adding "2>&1" to your command line.
-Ursprüngliche Nachricht-
Von: sqlite-users-boun...@mailinglists.sqlite.org
[mailto:sqlite-users-boun...@mailinglists.sqlite.org] Im Auftrag von Kaja
Varunku
The hex dump shows the sz-ligature encoded as (hex) e1. That is NOT a valid UTF
sequence.
Sqlite ASSUMES and EXPECTS all input to be UTF encoded. Passing ISO/ANSI
encoded special characters in strings is ok as long as the presentation layer
on both sides EXPECTS that same encoding. Using ISO/AN
, Gunter,
On Thu, Jun 23, 2016 at 10:59 AM, Hick Gunter wrote:
> Open the editor application, type in your command, save to file and the view
> with a hex editor. I suspect it will be in ISO encoding.
According to https://sqlite.org/src4/doc/trunk/www/data_encoding.wiki,
all this data should
Open the editor application, type in your command, save to file and the view
with a hex editor. I suspect it will be in ISO encoding.
-Ursprüngliche Nachricht-
Von: sqlite-users-boun...@mailinglists.sqlite.org
[mailto:sqlite-users-boun...@mailinglists.sqlite.org] Im Auftrag von Igor Koro
Does
.pragma table_info();
not solve your problem?
-Ursprüngliche Nachricht-
Von: sqlite-users-boun...@mailinglists.sqlite.org
[mailto:sqlite-users-boun...@mailinglists.sqlite.org] Im Auftrag von Rapin
Patrick
Gesendet: Freitag, 17. Juni 2016 10:57
An: sqlite-users@mailinglists.sqlite.
supported for Unicode
There are some unintelligible text in my database. Is there any methods to see
their byte sequence?
Best Regards,
Wang Wei
-Original Message-
From: sqlite-users-boun...@mailinglists.sqlite.org
[mailto:sqlite-users-boun...@mailinglists.sqlite.org] On Behalf Of Hick
The answer is very simple: Do not use ANSI/ISO encoding with SQLite. SQLite
expects Unicode.
-Ursprüngliche Nachricht-
Von: sqlite-users-boun...@mailinglists.sqlite.org
[mailto:sqlite-users-boun...@mailinglists.sqlite.org] Im Auftrag von Wang, Wei
Gesendet: Mittwoch, 15. Juni 2016 04:44
Yes, I missed the trailing 00
-Ursprüngliche Nachricht-
Von: sqlite-users-boun...@mailinglists.sqlite.org
[mailto:sqlite-users-boun...@mailinglists.sqlite.org] Im Auftrag von
Jean-Christophe Deschamps
Gesendet: Mittwoch, 08. Juni 2016 09:37
An: SQLite mailing list
Betreff: Re: [sqlite]
That the same character is found in both encodings is no surprise. You need to
look at the actual sequence of bytes.
Comparing a file containing just the "capital A with diaresis" yields
A 1 Byte sequence 0xC4 in ANSI
A 2 Byte sequence 0xC384 in en_US.UTF8 on a RH5 linux system
A 3 Byte Sequence
As already stated, this is not a problem of SQLite.
SQLite assumes all input to be correctly encoded in UTF (unicode), the precise
flavor of which may be set (once, between creating a db file and the first
insert) by a pragma.
If you insert ISO (latin) encoded strings, SQLite will faithfully re
Would not
Replace into A () select ,,
from A [cross] join B on( );
do the trick? If a.rowid has an alias (i.e. integer primary key) then the
modified rows would be deleted, but reinserted with their respective previous
rowids. This may required switching foreign keys off fort he duration of t
SQLite will faithfully return whatever sequence of bytes you passed in when
inserting the data.
If you insert ISO-ANSI encoded data then please do not expect the returned data
to be magically converted to UTF.
BTW, this mailing list does not support attachments.
-Ursprüngliche Nachricht---
Process B can see only data that is committed before it's read transaction is
started.
I suspect you are creating a transaction in process B right after connecting to
the database that remains open for the lifetime of the connection.
This will force Process B to see the state as it was before i
SQLite does not use row level locking, only file level locking. You can use
BEGIN IMMEDIATE to exclude writers or BEGIN EXCLUSIVE to exclude readers and
writers. If you do not explicitly start a transaction, each statement
constitutes it's own transaction.
-Ursprüngliche Nachricht-
Von:
To get this effect you need to have 2 (shareable) images, each with their own
and very private copy of sqlite, loaded into the same process.
With the mentioned #defines that make all sqlite3 symbols become static, it is
quite easy to compile sometool.c and sqlite3.c into a single sometool.so (or
This is documented behaviour for SQLite:
SELECT a, MAX(b) table;
Will return (one of) the a value(s) that comes from the same row as the MAX(b).
If there are not exactly on of MIN or MAX aggregate functions, SQLite is free
to pick any row (within a group) to return non-aggregated columns from.
No,you just have to log the bound parameters and a reference to the prepared
statement (so the other side will know which statement to prepare).
Or just log the statement & the parameters each time.
-Original Message-
From: sqlite-users-bounces at mailinglists.sqlite.org
[mailto:sqlite-u
May I suggest using a statement log of the "primary" database to update the
secondary sites? If you have a sequence counter (separate or embedded) then the
state of the database could be recovered from a backup (sequence counter x)
plus the log files for all statements from x+1 to "current".
--
>
>For instance, do you care if someone enters a time which is skipped by the
>clocks going forward ? If at 1am your clocks skip straight to 2am, do you
>care if someone enters a time of 1:30am on that >day ?
>
>
>Simon.
>
Our local time skips from 2am to 3am and from 3am back to 2am for DST. T
This is the much discussed and misunderstood feature that enables SQLite to
process statements like
SELECT A, B, MAX(C) FROM TABLE GROUP BY B;
and return the (or one of the) value(s) of A associated with the maximum value
of C within each group of B in just one full table scan.
By extension, t
The Pointer you received calling sqlite3_value_test16() on the FIRST argument
is not invalidated by calling the same function on the SECOND argument. Value
conversions may (and do for specific calling sequences) happen only when
calling a different sqlite3_value_x() function on the SAME argument
Try "limit 20". The hex function interprets the argument as a blob. This causes
your integer value to be converted to text, and the hex representation of that
text is your result.
-Urspr?ngliche Nachricht-
Von: sqlite-users-bounces at mailinglists.sqlite.org
[mailto:sqlite-users-bounces
The "Usability" of an index for a certain set of constraints ends with the
first (in the order mentioned in the index) field with an inequality constraint.
However, and index on (gx,gy) is still be faster for the query shown than just
on (gx), because the value of the second field is read from t
The expression "a in ('abc','def')" will return either TRUE or FALSE so your
condition devolves to "a in (TRUE, FALSE)" which is FALSE for all text values.
-Urspr?ngliche Nachricht-
Von: sqlite-users-bounces at mailinglists.sqlite.org
[mailto:sqlite-users-bounces at mailinglists.sqlite.o
You are hopefully aware of the fact that SQLite associates type with the actual
values and not the containers(columns) used to hold these values? This means
that a data object of any type may be held/returned in a column, irrespective
of the declared type (which, for expressions, is NULL).
What
While it is technically possible to convincingly fake an SQLite context to call
strftimeFunc() with, it also means that you are ignoring SQLite function
overloading. And making yourself dependant on internal changes to SQLite
structures that are opaque for a reason.
-Urspr?ngliche Nachricht
It seems your 14 digit API well number is being converted to a real before
being output with only 2 digits of precision, giving the string "3.11E+13".
This is nearly guaranteed to NOT be unique. You need to request a CSV File with
the API well number in string format.
-Urspr?ngliche Nachric
Assuming the "id" is the primary key of your table "table_name", your statement
will list the id of all the records present (full scan, reading every entry of
the implicit primary key index).
To find out if a specific record exists, use "select count() from table_name
where id = " to return a s
There is no unique constraint (express or implied) in your schema, therefore no
conflict occurs and it is possible to insert as many identical rows as your
diskspace will hold.
-Urspr?ngliche Nachricht-
Von: sqlite-users-bounces at mailinglists.sqlite.org
[mailto:sqlite-users-bounces at
Works as advertised. A database in WAL mode does not allow the page size to be
changed.
-Urspr?ngliche Nachricht-
Von: sqlite-users-bounces at mailinglists.sqlite.org
[mailto:sqlite-users-bounces at mailinglists.sqlite.org] Im Auftrag von Yongil
Jang
Gesendet: Donnerstag, 25. Februar 20
Short answer: you can't. It would require rebuilding every single page of the
database.
Exception 1: If the database is empty, the pragma will set the page size.
Exception 2: If your database is not empty and you run VACUUM (which rebuilds
every page of the database anyway) immediately after is
Yes it is expected. Strings always compare greater than numbers. Arithmetic
operators will apply numeric affinity to their operands, allowing e.g. the
addition of a string and an integer to produce the expected result.
-Urspr?ngliche Nachricht-
Von: sqlite-users-bounces at mailinglists.s
-Urspr?ngliche Nachricht-
Von: sqlite-users-bounces at mailinglists.sqlite.org
[mailto:sqlite-users-bounces at mailinglists.sqlite.org] Im Auftrag von nomad
at null.net
Gesendet: Freitag, 19. Februar 2016 11:01
An: SQLite mailing list
Betreff: [sqlite] EXPLAIN QUERY PLAN for non-SELECT st
The order of fields in the multicolumn index matters.
Taken in the order of fields in the index, the first inequality relation
terminates the part of the index that is usable.
For a constraint "plate EQUALS and date BETWEEN" you need an index on
(plate,date). Your index is only usable for "date
Basic idea, no testing
The core query is
Select F1 as key,count() as count from MyTable group by F1 having count>1;
The number of distinct F1 values is
select count() from ()
The number of conflict records is
Select sum(count) from ()
And the update would be
Update MyTable set F2=9 where F1
Consider
asql> select '1' >= 1, '1' <= 1;
'1' >= 1 '1' <= 1
1 0
This is because of the implicit ordering of TEXT and INTEGER values.
Strftime() returns a text; in the expression "strftime() + 1" the arithmetic
operator "casts" its left hand operand to integer (actual
mailinglists.sqlite.org] Im Auftrag von Yannick
Duch?ne
Gesendet: Freitag, 05. Februar 2016 12:38
An: sqlite-users at mailinglists.sqlite.org
Betreff: Re: [sqlite] json_group_array
On Fri, 5 Feb 2016 07:51:06 +
Hick Gunter wrote:
> That is because count(a) and count(*) means two differ
That is because count(a) and count(*) means two different things. The first
counts values, the second counts rows.
-Urspr?ngliche Nachricht-
Von: sqlite-users-bounces at mailinglists.sqlite.org
[mailto:sqlite-users-bounces at mailinglists.sqlite.org] Im Auftrag von TJ
O'Donnell
Gesendet
Does the error still occur if you run with only one thread? Does each thread
have ist own connection or are you sharing a single connection across multiple
threads?
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Von: sqlite-users-bounces at mailinglists.sqlite.org
[mailto:sqlite-users-bounces at mailinglist
Adding the INDEXED BY changed the nesting order of the loops. Also, note the
word AUTOMATIC in the query plan: This means that the QP has decided it is
worthwhile to build an Index just for this one query.
The first plan in English:
Build an Index on T2.E = 2 that also contains the field
You can either printf() the statement to insert the value into the text, or use
SQL variables to prepare the generic statement and sqlite3_bind_xxx() the
desired value.
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Von: sqlite-users-bounces at mailinglists.sqlite.org
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Have you tried running ANALYZE on a representative dataset? This will determine
the "shape" of your tables and allow the query planner to make better guesses
of the costs associated with each join.
If, after ANALYZE, you still feel the need to improve over the query planners'
ordering, you can
REPLACE will delete the offending row in the referenced table and insert a new
one with a newly generated rowid. If the foreign key references the rowid, the
DELETE CASCADE will be invoked because there is no longer a record with the
referenced rowid.
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Von: sqli
Use the documented and supported sqlite3_set_authorizer() function to achieve
security vetting of SQL Statements. This calls a user-supplied function with
the details of which tables and fields the user is attempting to access and if
this is a read or write access.
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Just a wild guess: The NSData object has an overhead of 16 bytes and the
(overloaded/member?) sizeof() function returns the NET contents, not the total
size which should be 16 bytes (the overhead) longer.
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