Good catch! I will check if I have similar errors, but printf() returns
TEXT, round() returns FLOAT. So, do your numerical comparisons BEFORE
formatting statements.
On Mon, Sep 16, 2019 at 2:45 AM Hick Gunter wrote:
> This is well documented in https://sqlite.org/datatypes.html and
>
> On Sep 13, 2019, at 1:30 PM, Keith Medcalf wrote:
>
> The only thing that is clear is that where the overhead of executing each
> select is significant it is clearly better to execute fewer of them.
Thanks for the research, Keith!
In my case the per-query overhead is lower since I'm
On 16 Sep 2019, at 5:58pm, Jens Alfke wrote:
> Experimentally, the optimizer seems to choose an index search even with the
> simpler query. I ran this on a test database with about 30k rows.
In case you forgot I'm just reminding you to run ANALYZE after putting your
data and indexes in.
> On Sep 13, 2019, at 10:57 AM, Hick Gunter wrote:
>
> This is faster if the number of keys in the list is small relative to the
> number of records in the table.
> If the number of keys is similar to the number of records in the table, then
> a simple full table scan may be faster.
It will, but that depends how many rows there are.
That is, the statement: SELECT * FROM t1 WHERE id IN (1,2,3,4,5,6)
Is equivalent to
CREATE TEMPORARY TABLE keyset (key PRIMARY KEY);
INSERT OR IGNORE INTO keyset VALUES (1), (2), (3), (4), (5), (6);
SELECT * FROM t1 WHERE id IN keyset;
DROP
Stop stop stop
> create table x
> (
>id integer primay key,
>datablob
> );
I did not see this until searching for the word PRIMARY and not finding it.
Thus id is not a primary key at all. Probably it is a good habit to always add
WITHOUT ROWID when there is an explicit primary
Hi,
I'd like to have regexp support in sqlite3.
https://www.sqlite.org/lang_expr.html#regexp
But it is not clear how to install it for sqlite3 installed by
homebrew. Does anybody how to install it? Thanks.
https://stackoverflow.com/questions/5071601/how-do-i-use-regex-in-a-sqlite-query
--
Keith Medcalf, on Monday, September 16, 2019 01:33 PM, wrote...
>
> It will, but that depends how many rows there are.
>
> That is, the statement: SELECT * FROM t1 WHERE id IN (1,2,3,4,5,6)
>
> Is equivalent to
>
> CREATE TEMPORARY TABLE keyset (key PRIMARY KEY);
> INSERT OR IGNORE INTO keyset
Do you know what the commands are to just compile for the regex support?
> SQLite doesn't come with a regexp implementation; it has to be added by an
> extension.
> I searched the website; there's a simple implementation here:
>
>
On Monday, 16 September, 2019 14:22, E.Pasma wrote:
>Stop stop stop
>> create table x
>> (
>>id integer primay key,
>>datablob
>> );
>I did not see this until searching for the word PRIMARY and not finding
>it. Thus id is not a primary key at all. Probably it is a good habit
On Sep 16, 2019, at 6:24 PM, Peng Yu wrote:
>
> Do you know what the commands are to just compile for the regex support?
https://www.sqlite.org/loadext.html
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> On Sep 16, 2019, at 1:44 PM, Peng Yu wrote:
>
> But it is not clear how to install it for sqlite3 installed by
> homebrew. Does anybody how to install it? Thanks.
SQLite doesn't come with a regexp implementation; it has to be added by an
extension.
I searched the website; there's a simple
This is well documented in https://sqlite.org/datatypes.html and
https://sqlite.org/datatype3.html
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