> select col1, col2 from mytable order by cast(body_size as float); And if you care about speed of select, you could create appropriate index:
create index mytable_bodysize_index on mytable(cast(body_size as float)); 2018-05-18 0:13 GMT+02:00, Keith Medcalf <kmedc...@dessus.com>: > > Why not encode (speak / say) what you want to do directly, rather than > prayerfully relying on implementation details -- > > select col1, col2 from mytable order by cast(body_size as float); > > > --- > The fact that there's a Highway to Hell but only a Stairway to Heaven says a > lot about anticipated traffic volume. > > >>-----Original Message----- >>From: sqlite-users [mailto:sqlite-users- >>boun...@mailinglists.sqlite.org] On Behalf Of Tim Streater >>Sent: Thursday, 17 May, 2018 15:42 >>To: SQLite mailing list >>Subject: [sqlite] Function to use to convert a text float to a float >>for use in ORDER BY >> >>My db has a table with a column defined thus: >> >> body_size text default '0.0' >> >>whose purpose is to hold the size of the item that the row >>represents. All rows contain a value but as a string to one decimal >>place, not a number. So the column contains strings such as '0.0', >>'3.7', '22.9', etc. All are positive. >> >>Now I want to use the body_size in an ORDER BY so I'll need SQLite to >>convert the values to a float. What will be the best function to use? >>I'd thought of this: >> >> select col1, col2 from mytable order by round(body_size,1) >> >>however the doc doesn't specify whether round accepts a non-numeric >>argument. Perhaps: >> >> select col1, col2 from mytable order by abs(body_size) >> >>would be better, but I wonder which is fastest (although speed may >>not matter too much, the typical select shouldn't return more than >>few thousand rows). >> >> >>-- >>Cheers -- Tim >>_______________________________________________ >>sqlite-users mailing list >>sqlite-users@mailinglists.sqlite.org >>http://mailinglists.sqlite.org/cgi-bin/mailman/listinfo/sqlite-users > > > > _______________________________________________ > sqlite-users mailing list > sqlite-users@mailinglists.sqlite.org > http://mailinglists.sqlite.org/cgi-bin/mailman/listinfo/sqlite-users > _______________________________________________ sqlite-users mailing list sqlite-users@mailinglists.sqlite.org http://mailinglists.sqlite.org/cgi-bin/mailman/listinfo/sqlite-users
