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Using a join on 3 tables, select 5 columns and 10 rows from the 3 tables without the use of a Cartesian product
Query:
SELECT E.LAST_NAME, E.FIRST_NAME, S.BUILDING, S.BRANCH, C.COMPANY FROM EMPLOYEE1 E JOIN STAFF S ON E.EMP_ID=S.EMP_ID JOIN CONTRACT C ON C.EMP_ID=S.EMP_ID WHERE ROWNUM<6;
Select distinct rows using joins on 3 tables without the use of a Cartesian product.
SELECT DISTINCT E.LAST_NAME,E.FIRST_NAME,S.BUILDING,S.BRANCH,C.COMPANY FROM EMPLOYEE1 E JOIN STAFF S ON E.EMP_ID=S.EMP_ID JOIN CONTRACT C ON C.EMP_ID=S.EMP_ID;
set serveroutput on declare a number(5); b number(5); c number(5); begin a:=&a; b:=&b; c:=a/b; dbms_output.put_line(c); exception when zero_divide then d
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