SQL - filtering data based on AND condition

From: gospar <no.spam_at_my.place>
Date: Wed, 4 Jun 2003 15:15:59 +0200
Message-ID: <bbkrbp$hd9$1@sunce.iskon.hr>

I wonder if this problem can be solved with one query statement:

CREATE TABLE PERSON(PERSON_ID NUMBER(10),NAME VARCHAR2(50)); INSERT INTO PERSON VALUES(1,'Mike');
INSERT INTO PERSON VALUES(2,'John');
CREATE TABLE LANGUAGE(LANG_ID NUMBER(10),NAME VARCHAR2(50));

INSERT INTO LANGUAGE VALUES(1,'English');
INSERT INTO LANGUAGE VALUES(2,'German');
INSERT INTO LANGUAGE VALUES(3,'Italian');
CREATE TABLE LANGUAGE_SKILL(PERSON_ID NUMBER(10), LANG_ID NUMBER(10));
INSERT INTO LANGUAGE_SKILL VALUES(1,1); -- Mike speaks English

INSERT INTO LANGUAGE_SKILL VALUES(1,2); -- Mike speaks German INSERT INTO LANGUAGE_SKILL VALUES(2,1); -- John speaks English COMMIT; Question:
How to select all persons who speak two (or any number) of selected languages.

Example 1: Give me all persons who speak English AND German. Result 1: Mike

Example 2: Give me all persons who speak English AND English Result 2: Mike, John

Example 3: Give me all persons who speak English AND Italian AND German Result 3: none

Note:
Language and Person table can have any number of rows. There should be 3 SELECT statements for this 3 examples which differ only in WHERE clause. Received on Wed Jun 04 2003 - 08:15:59 CDT