Select Query Oracle PLSQL

SQL>
SQL> create table emp(
  2           emp_no                 integer         primary key,
  3           lastname               varchar2(20)    not null,
  4           firstname              varchar2(15)    not null,
  5           midinit                varchar2(1),
  6           street                 varchar2(30),
  7           city                   varchar2(20),
  8           state                  varchar2(2),
  9           zip                    varchar2(5),
 10           shortZipCode                   varchar2(4),
 11           area_code              varchar2(3),
 12           phone                  varchar2(8),
 13           salary                 number(5,2),
 14           birthdate              date,
 15           startDate              date,
 16           title                  varchar2(20),
 17           dept_no                integer         ,
 18           mgr                    integer,
 19           region                 number,
 20           division               number,
 21           total_sales            number
 22  );
Table created.
SQL> -- emp Table Inserts:
SQL> insert into emp(emp_no, lastname, firstname, midinit, street, city, state, zip,shortZipCode, area_code, phone, birthdate, title)values
  2                      (1,'Z','Joy','R','1 Ave','New York','NY','12122','2333','212','200-1111','12-nov-1976','President');
1 row created.
SQL> insert into emp(emp_no, lastname, firstname, midinit, street, city, state, zip,shortZipCode, area_code, phone, salary, birthdate, startDate,title, dept_no, mgr, region, division, total_sales)valu
es
  2                      (2,'X','Lucy','J','1 Street','New York','NY','43552','6633','212','234-4444',7.75,'21-mar-1976','1-feb-1994','Sales Manager',2,1,100,10,40000);
1 row created.
SQL> insert into emp(emp_no, lastname, firstname, midinit, street, city, state, zip,shortZipCode, area_code, phone, salary, birthdate, startDate,title, dept_no, mgr, region, division, total_sales)valu
es
  2                      (3,'Y','Jordan','E','1 Drive','New York','NY','76822','8763','212','222-2222',7.75,'14-feb-1963','15-mar-1995','Sales Clerk',2,2,100,10,10000);
1 row created.
SQL> insert into emp(emp_no, lastname, firstname, midinit, street, city, state, zip, shortZipCode, area_code, phone, salary, birthdate, startDate, title, dept_no, mgr, region, division, total_sales)va
lues
  2                      (4,'Washington','Georgia','J','1 13th Street Apt 14','New York','NY','43122','4333','212','340-4365',11.50,'2-jul-1963','21-apr-1994','Designer',1,1,100,10,40000);
1 row created.
SQL> insert into emp(emp_no, lastname, firstname, midinit, street, city, state, zip, shortZipCode, area_code, phone, salary, birthdate, startDate, title, dept_no, mgr, region, division, total_sales)va
lues
  2                      (5,'Jason','Jordan','J','56 Langer Street','Staten Island','NY','23332','4983','718','777-4365',21.65,'15-may-1958','2-aug-1994','Designer',1,1,100,10,40000);
1 row created.
SQL>
SQL>
SQL> select emp_no,
  2   lastname || ', ' || firstname as "Name",
  3   salary * 40 as "Weekly Salary"
  4    from emp
  5   order by "Weekly Salary" desc;
    EMP_NO Name                                  Weekly Salary
---------- ------------------------------------- -------------
         1 Z, Joy
         5 Jason, Jordan                                   866
         4 Washington, Georgia                             460
         2 X, Lucy                                         310
         3 Y, Jordan                                       310
5 rows selected.
SQL>
SQL>
SQL> drop table emp;
Table dropped.