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 |
Thanks in advance
Leo
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