On Tue, Mar 9, 2010 at 7:34 AM, Pavel Ivanov <paiva...@gmail.com> wrote: >> sqlite> SELECT Min(m) AS m FROM t WHERE 1=2; >> m >> ---------- >> sqlite> SELECT Min(m) FROM t; >> Min(m) >> ---------- >> 88 > > Puneet, note that you probably missed one empty row of terminal output > in the first query above and when there's no row returned sqlite3 > command line utility doesn't print any headers information. Try this > query to check things out: SELECT COUNT(*) FROM (SELECT Min(m) AS m > FROM t WHERE 1=2). > >
Yes, you are absolutely correct. > Pavel > > On Tue, Mar 9, 2010 at 8:04 AM, P Kishor <punk.k...@gmail.com> wrote: >> On Tue, Mar 9, 2010 at 6:18 AM, Tim Romano <tim.rom...@yahoo.com> wrote: >>> Wrapping a column in the min() function causes a query that returns no >>> rows to return a row? >>> >>> select c from T where 1=2 // returns 0 rows >> >> The above is correct SQL, and the answer is correct. >> >>> select min(c) from T where 1=2 // returns 1 row >> >> You should be getting 0 rows; I do. What version of sqlite are you running? >> >> SQLite version 3.6.19 >> Enter ".help" for instructions >> Enter SQL statements terminated with a ";" >> sqlite> CREATE TABLE t (m); >> sqlite> INSERT INTO t VALUES (88); >> sqlite> INSERT INTO t VALUES (89); >> sqlite> SELECT * FROM t; >> m >> ---------- >> 88 >> 89 >> sqlite> SELECT Min(m) AS m FROM t WHERE 1=2; >> m >> ---------- >> sqlite> SELECT Min(m) FROM t; >> Min(m) >> ---------- >> 88 >> >> >>> select min(88,99) from T where 1=2 // returns 0 rows >> >> The above is correct SQL and the answer is correct. Per the docs, >> "Note that min() is a simple function when it has 2 or more arguments >> but operates as an aggregate function if given only a single >> argument." >> >> Finally, note that when returning both aggregate and non-aggregate >> columns, you should use the GROUP BY clause. I believe that SQLite >> will return rows even without GROUP BY, but the answer may be >> undependable. >> >>> >>> Tim Romano >>> >> .. >> >> -- Puneet Kishor http://www.punkish.org Carbon Model http://carbonmodel.org Charter Member, Open Source Geospatial Foundation http://www.osgeo.org Science Commons Fellow, http://sciencecommons.org/about/whoweare/kishor Nelson Institute, UW-Madison http://www.nelson.wisc.edu ----------------------------------------------------------------------- Assertions are politics; backing up assertions with evidence is science ======================================================================= _______________________________________________ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
