Date sent: Thu, 01 Jan 2004 23:42:17 +0100 To: [EMAIL PROTECTED] From: Hennie Peters <[EMAIL PROTECTED]> Subject: Re: [sqlite] Find a row
> to get the number of rows: > select count(*) from testtableint; > or the next on might be quicker: > select count(1) from testtableint; It does visit all rows 8|Rewind|0|13| 9|Integer|1|0|1 10|Integer|0|0| 11|AggFunc|0|1|ptr(0x4416b0) 12|Next|0|9| 13|Close|0|0| 14|AggNext|0|18| 15|AggGet|0|0| but it does nothing with them, maybe it is most quick, does someone has comment on this. thanks Bert Verhees > > How can you be sure that the first row contains the lowest rowid when doing: > "select rowid,..... from testtableint where rowid>2 limit 1" > Would you need to do: > "select rowid,..... from testtableint where rowid>2 order by rowid limit 1" > or does sqlite order on rowid by default ? > > At 23:15 1-1-2004 +0100, [EMAIL PROTECTED] wrote: > > > > > > Is it really much quicker than: > > > select min(rowid) from testtableint having rowid>2; > > > and is there a way to show the time a query takes to execute ? > > > >I guess this what you mean: > >select min(rowid) from testtableint where rowid>2 > >because having can only be used together with "group by" > > > >I think it is not that fast because it has to do aggregate-functions, > >which mean an > >extra overhead, and extra above this fact, it is impossible to retrieve > >other fields > >when doing an aggregate, which means two queries have to be executed to get > >the compleet row. > > > >But now we are here, is there a way to retrieve the number of rows a table > >has > >without getting all the rows? > > > >thanks in advance > > > >Bert Verhees > > > > > > > >--------------------------------------------------------------------- > >To unsubscribe, e-mail: [EMAIL PROTECTED] > >For additional commands, e-mail: [EMAIL PROTECTED] > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > > > --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
