Hi all, having a bit of a brain burp day! :-)
I have
CREATE TABLE user
(
user_id INTEGER PRIMARY KEY,
user_name VARCHAR(25),
);
CREATE TABLE language
(
iso_code CHAR(2) PRIMARY KEY,
language_name VARCHAR(30)
);
CREATE TABLE user_language
(
ul_user_id INT,
ul_iso_code CHAR(2),
PRIMARY KEY (ul_user_id, ul_iso_code),
CONSTRAINT ul_user_id_fk FOREIGN KEY (ul_user_id) REFERENCES user (user_id),
CONSTRAINT ul_iso_code_fk FOREIGN KEY (ul_iso_code) REFERENCES language (iso_code)
);
Then I input data thus.
INSERT INTO user VALUES(1, 'Sandor');
INSERT INTO user VALUES(2, 'Gabor');
INSERT INTO language VALUES ('EN', 'English');
INSERT INTO language VALUES ('DE', 'German');
INSERT INTO user_language VALUES(1, 'EN');
INSERT INTO user_language VALUES(1, 'DE');
INSERT INTO user_language VALUES(2, 'EN');
Now, I want the user who speaks English and the German - I may need to specify 3, 4
or conceivably even 5 languages.
I have done this, but I'm stuck :-)
SELECT u.user_name, l.language_name
FROM user u
JOIN user_language ul
ON u.user_id = ul.ul_user_id
JOIN language l
ON ul.ul_iso_code = l.iso_code
this gives me
Sandor, German
Sandor, English
Gabor, English
