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Name Type Nullable Default Comments
-------- ------------ -------- ------- -------- EMPNO NUMBER(4) Ô±¹¤ºÅ
ENAME VARCHAR2(10) Y Ô±¹¤ÐÕÃû JOB VARCHAR2(9) Y ¹¤×÷ MGR NUMBER(4) Y Éϼ¶±àºÅ HIREDATE DATE Y ¹ÍÓ¶ÈÕÆÚ SAL NUMBER(7,2) Y н½ð COMM NUMBER(7,2) Y Ó¶½ð
DEPTNO NUMBER(2) Y ²¿ÃűàºÅ
scott.dept²¿Ãűí
Name Type Nullable Default Comments
------ ------------ -------- ------- -------- DEPTNO NUMBER(2) ²¿ÃűàºÅ
DNAME VARCHAR2(14) Y ²¿ÃÅÃû³Æ LOC VARCHAR2(13) Y µØµã
Ìáʾ£º¹¤×Ê=н½ð+Ó¶½ð scott.emp±íµÄÏÖÓÐÊý¾ÝÈçÏ£º
SQL> select * from emp;
EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO
----- ---------- --------- ----- ----------- --------- --------- ------
7369 SMITH CLERK 7902 1980-12-17 800.00 20
7499 ALLEN SALESMAN 7698 1981-2-20 1600.00 300.00 30
7521 WARD SALESMAN 7698 1981-2-22 1250.00 500.00 30
7566 JONES MANAGER 7839 1981-4-2 2975.00 2
0
7654 MARTIN SALESMAN 7698 1981-9-28 1250.00 1400.00 30
7698 BLAKE MANAGER 7839 1981-5-1 2850.00 30
7782 CLARK MANAGER 7839 1981-6-9 2450.00 10
7788 SCOTT ANALYST 7566 1987-4-19 4000.00 20
7839 KING PRESIDENT 1981-11-17 5000.00 10
7844 TURNER SALESMAN 7698 1981-9-8 1500.00 0.00 30
7876 ADAMS CLERK 7788 1987-5-23 1100.00 20
7900 JAMES CLERK 7698 1981-12-3 950.00 30
7902 FORD ANALYST 7566 1981-12-3 3000.00 20
7934 MILLER CLERK 7782 1982-1-23 1300.00 10
102 EricHu Developer 1455 2011-5-26 1 5500.00 14.00 10
104 huyong PM 1455 2011-5-26 1 5500.00 14.00 10
105 WANGJING Developer 1455 2011-5-26 1 5500.00 14.00 10
17 rows selected
Scott.dept±íµÄÏÖÓÐÊý¾ÝÈçÏ£º SQL> select * from dept;
DEPTNO DNAME LOC
------ -------------- ------------- 10 ACCOUNTING NEW YORK 20 RESEARCH DALLAS 30 SALES CHICAGO 40 OPERATIONS BOSTON 50 50abc 50def 60 Developer HaiKou
6 rows selected
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12£®Áгöн½ð¸ßÓÚÔÚ²¿ÃÅ30¹¤×÷µÄËùÓÐÔ±¹¤µÄн½ðµÄÔ±¹¤ÐÕÃûºÍн½ð¡£ 13£®ÁгöÔÚÿ¸ö²¿Ãʤ×÷µÄÔ±¹¤ÊýÁ¿¡¢Æ½¾ù¹¤×ÊºÍÆ½¾ù·þÎñÆÚÏÞ¡£ 14£®ÁгöËùÓÐÔ±¹¤µÄÐÕÃû¡¢²¿ÃÅÃû³ÆºÍ¹¤×Ê¡£ 15£®ÁгöËùÓв¿ÃŵÄÏêϸÐÅÏ¢ºÍ²¿ÃÅÈËÊý¡£ 16£®Áгö¸÷ÖÖ¹¤×÷µÄ×îµÍ¹¤×Ê¡£
17£®Áгö¸÷¸ö²¿ÃŵÄMANAGER£¨¾Àí£©µÄ×îµÍн½ð¡£ 18£®ÁгöËùÓÐÔ±¹¤µÄÄ깤×Ê,°´Äêн´ÓµÍµ½¸ßÅÅÐò¡£ ¸÷´ð°¸ÈçÏ£¬»¶Ó´ó¼Ò¸ø³ö²»³öµÄ½â´ð·½Ê½¡£
--------1£®ÁгöÖÁÉÙÓÐÒ»¸öÔ±¹¤µÄËùÓв¿ÃÅ¡£---------
SQL> select dname from dept where deptno in(select deptno from emp); DNAME
-------------- RESEARCH SALES
ACCOUNTING
--------»ò--------
SQL> select dname from dept where deptno in(select deptno from emp group by deptno having count(deptno) >=1); DNAME
-------------- ACCOUNTING RESEARCH SALES
--------2£®Áгöн½ð±È¡°SMITH¡±¶àµÄËùÓÐÔ±¹¤¡£----------
SQL> select * from emp where sal > (select sal from emp where ename = 'SMITH');
EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO
----- ---------- --------- ----- ----------- --------- --------- ------
7499 ALLEN SALESMAN 7698 1981-2-20 1600.00 300.00 30 7521 WARD SALESMAN 7698 1981-2-22 1250.00 500.00 30 7566 JONES MANAGER 7839 1981-4-2 2975.00 20
7654 MARTIN SALESMAN 7698 1981-9-28 1250.00 1400.00 30 7698 BLAKE MANAGER 7839 1981-5-1 2850.00 30 7782 CLARK MANAGER 7839 1981-6-9 2450.00 10 7788 SCOTT ANALYST 7566 1987-4-19 4000.00 20 7839 KING PRESIDENT 1981-11-17 5000.00 10
7844 TURNER SALESMAN 7698 1981-9-8 1500.00 0.00 30 7876 ADAMS CLERK 7788 1987-5-23 1100.00 20 7900 JAMES CLERK 7698 1981-12-3 950.00 30 7902 FORD ANALYST 7566 1981-12-3 3000.00 20 7934 MILLER CLERK 7782 1982-1-23 1300.00 10
102 EricHu Developer 1455 2011-5-26 1 5500.00 14.00 10 104 huyong PM 1455 2011-5-26 1 5500.00 14.00 10
105 WANGJING Developer 1455 2011-5-26 1 5500.00 14.00 10 16 rows selected
--------3£®ÁгöËùÓÐÔ±¹¤µÄÐÕÃû¼°ÆäÖ±½ÓÉϼ¶µÄÐÕÃû¡£----------
SQL> select a.ename,(select ename from emp b where b.empno=a.mgr) as boss_name from emp a; ENAME BOSS_NAME
---------- ---------- SMITH FORD ALLEN BLAKE WARD BLAKE JONES KING MARTIN BLAKE BLAKE KING CLARK KING SCOTT JONES KING
TURNER BLAKE ADAMS SCOTT JAMES BLAKE FORD JONES MILLER CLARK EricHu huyong