Thanks a lot. Both works fine. Leo
John Machin schrieb: > On 27/05/2009 1:09 AM, Leo Freitag wrote: > >> Hallo, >> >> I got some problems with a select on a foreign key with value null. >> I want to filter all male singers. >> >> CREATE TABLE 'tblsinger' ('id' INTEGER PRIMARY KEY, 'name' TEXT, >> 'fkvoice' INTEGER, 'sex' TEXT); >> INSERT INTO "tblsinger" VALUES(1,'Anna Netrebko',1, 'f'); >> INSERT INTO "tblsinger" VALUES(2,'Hanna Schwarz',2, 'f'); >> INSERT INTO "tblsinger" VALUES(3,'Luciano Pavarotti', 3, 'm'); >> INSERT INTO "tblsinger" VALUES(4,'Robert Lloyd', 4, 'm'); >> INSERT INTO "tblsinger" VALUES(5,'Robby Williams', null, 'm'); >> >> CREATE TABLE 'tblvoice' ('id' INTEGER PRIMARY KEY, 'voice' TEXT); >> INSERT INTO "tblvoice" VALUES(1,'sopran'); >> INSERT INTO "tblvoice" VALUES(2,'alt'); >> INSERT INTO "tblvoice" VALUES(3,'tenor'); >> INSERT INTO "tblvoice" VALUES(4,'bass'); >> >> SELECT tblsinger.name, tblsinger.sex, tblvoice.voice FROM tblsinger, >> tblvoice >> WHERE tblsinger.sex = 'm' AND tblsinger.fkvoice = tblvoice.id; >> >> -- Result >> >> Luciano Pavarotti | m | tenor >> Robert Lloyd | m | bass >> >> -- How do I have to modify the select statement to get the result below: >> >> Luciano Pavarotti | m | tenor >> Robert Lloyd | m | bass >> Robby Williams | m | >> > > sqlite> select s.name, s.sex, v.voice from tblsinger s left outer join > tblvoice v on s.fkvoice = v.id where s.sex = 'm'; > Luciano Pavarotti|m|tenor > Robert Lloyd|m|bass > Robby Williams|m| > > With "visible NULL": > > sqlite> select s.name, s.sex, ifnull(v.voice, 'UNKNOWN') from tblsinger > s left outer join tblvoice v on s.fkvoice = v.id where s.sex = 'm'; > Luciano Pavarotti|m|tenor > Robert Lloyd|m|bass > Robby Williams|m|UNKNOWN > > _______________________________________________ > sqlite-users mailing list > sqlite-users@sqlite.org > http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users > > _______________________________________________ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users