Oracle variety of common operations

1.Oracle SQL Developer using 1

Oracle SQL Developer is Oracle's own tools; another third-party tools commonly used Oracle's PL / SQL;

Enter SQL Developer; open a query window; execute a statement;

Query top of the window a row of buttons;
first execute the statement;
the second execution of the script;
the third submission; in some cases submitted to the database operation points, to take effect;
fourth fallback;
the eighth, and last, clear the entry area;

2. Oracle SQL Developer to use 2

Execute scripts in the query window; the result output tab in the window below the script;

Script output window, there are three tool buttons;
the first is the Clear button;

Clear output content after clicking; for next view;

3. Oracle SQL Developer to establish a connection

general user;

system user;

4. oracle sqlplus use substantially

5. Oracle SQL Developer to view the basic operation of the data table

After installation oracle, scott user comes with the example of Table 4;

Click to select a table; select data in the right side of the tab, view the data in a table;

6. Oracle View user table space

select default_tablespace from dba_users where username='scott'
select * from dba_tablespaces;
select username,default_tablespace from user_users;
select default_tablespace from dba_users where username='scott'
select * from dba_tablespaces;
select default_tablespace from dba_users where username='sys'
select username,default_tablespace from user_users;

7. Oracle View user's default table space

8. Oracle stored procedure substantially

9. Change password scott

Change the password is 123456 scott

Sys user login;
the ALTER by the User scott IDENTIFIED 123456;

10. Change the system password

Sys user login;

alter user system identified by 123456;
GRANT SYSDBA TO SYSTEM;

11. SQL Developer position

After installation is complete the contents of the Start menu has 1, 2;
wherein the operator database SQL Developer tool, similar to the Sql Management Studio;

12. Common join query

--自然连接不显示含有NULL的值
SELECT E.ENAME, E.SAL, D.DNAME, E.DEPTNO
   FROM EMP E, DEPT D
  WHERE E.DEPTNO = D.DEPTNO
  ORDER BY ENAME;

--左连接（+）在右面，以左边的表为准，显示左边含有NULL的数据
SELECT E.ENAME, E.SAL, D.DNAME, E.DEPTNO
  FROM EMP E, DEPT D
 WHERE E.DEPTNO = D.DEPTNO(+)
 ORDER BY ENAME;

--右连接（+）在左面，以右边的表为准，显示右边含有NULL的数据
 SELECT E.ENAME, E.SAL, D.DNAME, E.DEPTNO
   FROM EMP E, DEPT D
  WHERE E.DEPTNO(+) = D.DEPTNO
  ORDER BY ENAME;

--查询员工的工资等级
SELECT E.ENAME, S.GRADE
  FROM EMP E, SALGRADE S
 WHERE S.LOSAL <= E.SAL
   AND E.SAL <= S.HISAL;

--查询没有员工的部门
SELECT * FROM dept d WHERE NOT EXISTS (SELECT * FROM emp e WHERE e.deptno=d.deptno);