Hello !then
I did a modification to sqlite3 that basically define a new type
"sqlite_double" and use it instead of "double" (#define sqlite_double?
double) then I can redefine it to _Decimal64 (#define sqlite_double?
_Decimal64) this way with a modern C compiler we can have sqlite3 using
From: Frank Millman
Sent: Friday, December 11, 2015 4:21 PM
To: sqlite-users at mailinglists.sqlite.org
Subject: [sqlite] Problem with accumulating decimal values
> Hi all
>
> I am having a problem accumulating decimal values.
>
> I am actually using Python, but I can reproduce it in the
Frank,
The problem you are having is due to SQLite not following the SQL standard
regarding non-integral numeric types.
The SQL standard specifies that the DECIMAL type is exact numeric and able to
represent decimal numbers exactly. However, when you ask SQLite for a DECIMAL
column, that is
Hello, I have two mini minor remarks about the series.c example as of
2015-08-21
and referred to from the Table-Valued Functions paragraph of
https://www.sqlite
.org/vtab.html#tabfunc2
1. comment above seriesDisconnect
< ** This method is the destructor for series_cursor objects.
> ** This
6 dec 2015, Charles Leifer:
> In working on a Python wrapper around virtual tables, I thought it
> might be
> beneficial if SQLite provided an official C API for creating simple
> table-valued functions. The wrapper could build on the existing
> virtual
> table APIs and would consist of:
>
>
?I have the following query:
SELECT
(SELECT COUNT(*) FROM proverbs)AS Total
, (SELECT COUNT(*) FROM proverbs WHERE NOT used IS NULL) AS Used
But I want something like:
?SELECT
(SELECT COUNT(*) FROM proverbs)AS Total
On 2015/12/12 4:18 PM, Cecil Westerhof wrote:
> ?I have the following query:
> SELECT
> (SELECT COUNT(*) FROM proverbs)AS Total
> , (SELECT COUNT(*) FROM proverbs WHERE NOT used IS NULL) AS Used
>
> But I want something like:
> ?SELECT
>
On Sat, Dec 12, 2015 at 6:51 AM, Darren Duncan
wrote:
>
> Per another suggestion, the best workaround is to use an INTEGER type
> instead, and store an even multiple of whatever your smallest currency unit
> size is, eg cents rather than dollars.
>
As I understood, he is doing the math in
or, more elegantly...
WITH PC(t, u, f) AS (
SELECT 1, (P.used IS NOT NULL), (P.used IS NULL)
FROM proverbs AS P
)
SELECT SUM(PC.t) AS Total, SUM(PC.u) AS Used, SUM(PC.f) AS Free
FROM PC;
On 2015/12/12 4:18 PM, Cecil Westerhof wrote:
> ?I have the following query:
> SELECT
>
2015-12-12 15:24 GMT+01:00 R Smith :
>
>
> On 2015/12/12 4:18 PM, Cecil Westerhof wrote:
>
>> ?I have the following query:
>> SELECT
>> (SELECT COUNT(*) FROM proverbs)AS Total
>> , (SELECT COUNT(*) FROM proverbs WHERE NOT used IS NULL) AS Used
>>
>>
On 12-12-15 15:18, Cecil Westerhof wrote:
> ?I have the following query:
> SELECT
> (SELECT COUNT(*) FROM proverbs)AS Total
> , (SELECT COUNT(*) FROM proverbs WHERE NOT used IS NULL) AS Used
>
> But I want something like:
> ?SELECT
>
On 12-12-15 15:45, Luuk wrote:
>
>
> On 12-12-15 15:18, Cecil Westerhof wrote:
>> ?I have the following query:
>> SELECT
>> (SELECT COUNT(*) FROM proverbs) AS Total
>> , (SELECT COUNT(*) FROM proverbs WHERE NOT used IS NULL) AS Used
>>
>> But I want something like:
>> ?
On 12/12/2015 9:18 AM, Cecil Westerhof wrote:
> But I want something like:
> ?SELECT
> (SELECT COUNT(*) FROM proverbs)AS Total
> , (SELECT COUNT(*) FROM proverbs WHERE NOT used IS NULL) AS Used
> , (Total - Used)
2015-12-12 16:06 GMT+01:00 Luuk :
> On 12-12-15 15:18, Cecil Westerhof wrote:
>
>> ?I have the following query:
>>> SELECT
>>> (SELECT COUNT(*) FROM proverbs) AS Total
>>> , (SELECT COUNT(*) FROM proverbs WHERE NOT used IS NULL) AS Used
>>>
>>> But I want something like:
>>>
2015-12-12 16:23 GMT+01:00 Igor Tandetnik :
> On 12/12/2015 9:18 AM, Cecil Westerhof wrote:
>
>> But I want something like:
>> ?SELECT
>> (SELECT COUNT(*) FROM proverbs)AS Total
>> , (SELECT COUNT(*) FROM proverbs WHERE NOT used IS NULL) AS Used
>>
On 12 Dec 2015, at 2:42pm, Cecil Westerhof wrote:
>> SELECT
>>(SELECT COUNT(*) FROM proverbs) AS Total
>>, (SELECT COUNT(*) FROM proverbs WHERE used IS NOT NULL) AS Used
>>, (SELECT COUNT(*) FROM proverbs WHERE used IS NULL) AS Free
>>
>
> ?That is what I am using
2015-12-12 19:00 GMT+01:00 Simon Slavin :
>
> On 12 Dec 2015, at 2:42pm, Cecil Westerhof wrote:
>
> >> SELECT
> >>(SELECT COUNT(*) FROM proverbs) AS Total
> >>, (SELECT COUNT(*) FROM proverbs WHERE used IS NOT NULL) AS Used
> >>, (SELECT COUNT(*) FROM proverbs WHERE used IS
On 12 Dec 2015, at 6:14pm, Cecil Westerhof wrote:
> ?Not at the moment. But maybe that is a good idea.?
With clauses like
>>> WHERE used IS NOT NULL) AS Used
>>> WHERE used IS NULL
It should transform the work done.
Simon.
On 12 Dec 2015, at 6:19pm, Mohit Sindhwani wrote:
> Well, at least as far as SQLite goes, I think this settles it unambiguously
> for me:
> https://www.youtube.com/watch?v=giAMt8Tj-84
"As soon as I have a person need for Foreign Keys I'm sure you'll see them come
in pretty quick." -- Richard
2015-12-12 19:17 GMT+01:00 Simon Slavin :
>
> On 12 Dec 2015, at 6:14pm, Cecil Westerhof wrote:
>
> > ?Not at the moment. But maybe that is a good idea.?
>
> With clauses like
>
> >>> WHERE used IS NOT NULL) AS Used
>
> >>> WHERE used IS NULL
>
> It should transform the work done.
>
?Here
On 12 Dec 2015, at 7:52pm, Cecil Westerhof wrote:
> ?Here http://www.tutorialspoint.com/sqlite/sqlite_indexes.htm it is said
> that you should not use an index on columns that use a high number of NULL
> values. At the moment that is true. So I should not use an Index??
The tutorial thinks
2015-12-12 21:10 GMT+01:00 Simon Slavin :
>
> On 12 Dec 2015, at 7:52pm, Cecil Westerhof wrote:
>
> > ?Here http://www.tutorialspoint.com/sqlite/sqlite_indexes.htm it is said
> > that you should not use an index on columns that use a high number of
> NULL
> > values. At the moment that is true.
I am playing with SQLite. I am thinking about writing an application for
projects. At the moment I have the following:
CREATE TABLE `projects` (
`projectID` TEXTPRIMARY KEY,
`groupID` TEXT,
`isPersonal`INTEGER NOT NULL CHECK(isPersonal in (0, 1)),
`name`
On 12/12/15, Cecil Westerhof wrote:
> I am playing with SQLite. I am thinking about writing an application for
> projects. At the moment I have the following:
>
> CREATE TABLE `projects` (
> `projectID` TEXTPRIMARY KEY,
> `groupID` TEXT,
> `isPersonal`INTEGER NOT
2015-12-12 21:45 GMT+01:00 Richard Hipp :
> On 12/12/15, Cecil Westerhof wrote:
> > I am playing with SQLite. I am thinking about writing an application for
> > projects. At the moment I have the following:
> >
> > CREATE TABLE `projects` (
> > `projectID` TEXTPRIMARY KEY,
> >
I have the following tables:
CREATE TABLE "projects" (
"projectID" TEXT PRIMARY KEY,
"groupID" TEXT,
"isPersonal"INTEGER NOT NULL CHECK(ispersonal in (0, 1)),
"name" TEXT,
"description" TEXT,
"outcome" TEXT
);
CREATE INDEX projects_groupID_idx
On 2015-12-12 12:56 PM, Cecil Westerhof wrote:
>>> By the way: I am thinking about using UUID for projectID and groupID,
>> but I
>>> heard somewhere that it was a bad idea to use UUID for an indexed field.
>> Is
>>> this true??
>>
>> I think you might have misunderstood. UUID is almost always a
Though to the extent that speed is proportional to data size, it would be good
to use something other than hexadecimal to store UUIDs. Binary blobs would be
the most compact, but ASCII85 encoding would work well if you need strings.
Also, if these values are reused repeatedly as I suspect
On 12/12/15, Cecil Westerhof wrote:
> I have the following tables:
> CREATE TABLE "projects" (
> "projectID" TEXT PRIMARY KEY,
> );
> CREATE INDEX subprojects_projectID_idx
> ON projects(projectID);
Don't create indexes on primary keys. Doing so still gives a correct
answer, but it
2015-12-12 22:07 GMT+01:00 Darren Duncan :
> On 2015-12-12 12:56 PM, Cecil Westerhof wrote:
>
>> By the way: I am thinking about using UUID for projectID and groupID,
>>> but I
>>>
heard somewhere that it was a bad idea to use UUID for an indexed field.
>>> Is
>>>
this true??
For my part, in a database I designed that used a SHA-256 hash for a unique
identifier that was then a foreign key from many other tables, I stored that as
an integer and not as a hex string. If UUIDs are similarly numbers
fundamentally, they possibly could do likewise. I agree with Mark's
2015-12-12 22:12 GMT+01:00 Mark Hamburg :
> Though to the extent that speed is proportional to data size, it would be
> good to use something other than hexadecimal to store UUIDs. Binary blobs
> would be the most compact, but ASCII85 encoding would work well if you need
> strings.
>
> Also, if
2015-12-12 22:13 GMT+01:00 Richard Hipp :
> On 12/12/15, Cecil Westerhof wrote:
> > I have the following tables:
> > CREATE TABLE "projects" (
> > "projectID" TEXT PRIMARY KEY,
> > );
> ??
> > CREATE INDEX subprojects_projectID_idx
> > ON projects(projectID);
>
> Don't create indexes on
The first question(s) I would ask are:
Are all the fields case sensitive? (according to your definition they are)
Are any of them, other than the primary key, unique? (according to your
definition they are not)
Other than the isPersonal column all of the columns permit a NULL entry. Is
this
> > One other point: The use of grave accents to quote column names is a
> > mysql-ism. SQLite also supports that for compatibility. But you
> > still shouldn't do it. The proper SQL-standard way is double-quote.
> ?That is funny: I did not use them at first (or double). But I am using 'DB
>
2015-12-12 22:44 GMT+01:00 Keith Medcalf :
>
> The first question(s) I would ask are:
> Are all the fields case sensitive? (according to your definition they are)
>
?Do you mean the name or the contents?
?
> Are any of them, other than the primary key, unique? (according to your
>
2015-12-12 22:50 GMT+01:00 Keith Medcalf :
> > > One other point: The use of grave accents to quote column names is a
> > > mysql-ism. SQLite also supports that for compatibility. But you
> > > still shouldn't do it. The proper SQL-standard way is double-quote.
>
> > ?That is funny: I did not
Please forgive my lack of knowledge but for the life of me I can't figure
out what to install or how to install what I should be using. I'm using
VS2015 Community edition where I'm attempting to create a WPF desktop
application for windows (not specific to 8 or 10). I have a rather basic
On 2015-12-12 4:02 PM, Nicolette Warner wrote:
> Please forgive my lack of knowledge but for the life of me I can't figure
> out what to install or how to install what I should be using. I'm using
> VS2015 Community edition where I'm attempting to create a WPF desktop
> application for windows
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