유용 update문

테스트 테이블 확인. SQL> select deptno, max(sal) from emp group by deptno; DEPTNO MAX(SAL)---------- ---------- 30 2850 20 3000 10 5000 SQL> select * from dept_test; DEPTNO DNAME LOC SAL---------- ------------------- ----------- ---------- 10 ACCOUNTING NEW YORK 20 RESEARCH DALLAS 30 SALES CHICAGO 2850 40 OPERATIONS BOSTON -1 DBA Seoul 40 SALES CHICAGO 50 SALES CHICAGO 1111 7 rows selected. 무심코 지나쳐 버릴 것..

2009.12.09