On 5/16/08, P Kishor <[EMAIL PROTECTED]> wrote: > On 5/16/08, Scott Baker <[EMAIL PROTECTED]> wrote: > > Miguel wrote: > > > Estimates, > > > First of all, excuse my English, I recognise that it is not my strong. > > > I need to do a query on a table and I return the difference in minutes > > > between > > > two times loaded in the table. > > > Which would be the best way to make these differences. > > > Since already thank you very much and greetings. > > > > > > If you convert both dates to unixtime (seconds) and subtract you'll get > > seconds between the two dates. Then divide by 60. > > > > SELECT (strftime('%s','now') - strftime('%s','2004-01-01 02:34:56')) / 60; > > > > > > http://www.sqlite.org/cvstrac/wiki?p=DateAndTimeFunctions > > > > > > well, no not really. The original question is about subtracting date > in one row from the date in another row. This is an Igor-level > question, but the following comes to my mind -- > > Given the following table, > > qlite> create table t (a, b datetime); > sqlite> insert into t values (1, '1993-01-01 00:00:30'); > sqlite> insert into t values (2, '1992-02-12 00:12:29'); > sqlite> select * from t; > 1|1993-01-01 00:00:30 > 2|1992-02-12 00:12:29 > sqlite> select (julianday(t1.b) - julianday(t2.b)) d from t t1 left > join t t2 on t1.a = t2.a and t1.a = 1 or t2.a = 2 and d > 0; > > Replace julianday with the datetime function of your choice. Still, my > solution is not really good because I can't figure out how to get > exactly the result I want, but it almost gets me there. > >
fwiw, here is the correct solution for "returning the difference in minutes between two times loaded in a table" sqlite> .s CREATE TABLE t (i, a); sqlite> select * from t; i a ---------- ------------------- 1 1993-01-01 00:00:00 2 1993-01-10 00:19:00 3 1994-01-10 00:19:00 4 1994-01-12 00:19:00 sqlite> select (strftime('%s',t1.a) - strftime('%s',t2.a))/60 d from t t1 join t t2 on t1.i != t2.i and t1.i = 1 and t2.i = 2; d ---------- -12979 sqlite> replace 1 and 2 in the query above with the row ids that you want to query. > > > -- > > > Scott Baker - Canby Telcom > > RHCE - System Administrator - 503.266.8253 > > -- Puneet Kishor http://punkish.eidesis.org/ Nelson Institute for Environmental Studies http://www.nelson.wisc.edu/ Open Source Geospatial Foundation (OSGeo) http://www.osgeo.org/ _______________________________________________ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users