Oracle PL/SQL Tutorial/Table Joins/Table Alias — различия между версиями

Материал из SQL эксперт
Перейти к: навигация, поиск
м (1 версия)
 
м (1 версия)
 
(нет различий)

Текущая версия на 10:03, 26 мая 2010

Calculation between column from different tables

SQL>
SQL>
SQL> create table employees(
  2    empno      NUMBER(4)
  3  , ename      VARCHAR2(8)
  4  , init       VARCHAR2(5)
  5  , job        VARCHAR2(8)
  6  , mgr        NUMBER(4)
  7  , bdate      DATE
  8  , msal       NUMBER(6,2)
  9  , comm       NUMBER(6,2)
 10  , deptno     NUMBER(2) ) ;
Table created.
SQL>
SQL>
SQL> insert into employees values(1,"Jason",  "N",  "TRAINER", 2,   date "1965-12-18",  800 , NULL,  10);
1 row created.
SQL> insert into employees values(2,"Jerry",  "J",  "SALESREP",3,   date "1966-11-19",  1600, 300,   10);
1 row created.
SQL> insert into employees values(3,"Jord",   "T" , "SALESREP",4,   date "1967-10-21",  1700, 500,   20);
1 row created.
SQL> insert into employees values(4,"Mary",   "J",  "MANAGER", 5,   date "1968-09-22",  1800, NULL,  20);
1 row created.
SQL> insert into employees values(5,"Joe",    "P",  "SALESREP",6,   date "1969-08-23",  1900, 1400,  30);
1 row created.
SQL> insert into employees values(6,"Black",  "R",  "MANAGER", 7,   date "1970-07-24",  2000, NULL,  30);
1 row created.
SQL> insert into employees values(7,"Red",    "A",  "MANAGER", 8,   date "1971-06-25",  2100, NULL,  40);
1 row created.
SQL> insert into employees values(8,"White",  "S",  "TRAINER", 9,   date "1972-05-26",  2200, NULL,  40);
1 row created.
SQL> insert into employees values(9,"Yellow", "C",  "DIRECTOR",10,  date "1973-04-27",  2300, NULL,  20);
1 row created.
SQL> insert into employees values(10,"Pink",  "J",  "SALESREP",null,date "1974-03-28",  2400, 0,     30);
1 row created.
SQL>
SQL>
SQL> create table salgrades
  2  ( grade      NUMBER(2)
  3  , lowerlimit NUMBER(6,2)
  4  , upperlimit NUMBER(6,2)
  5  , bonus      NUMBER(6,2)
  6  ) ;
Table created.
SQL>
SQL>
SQL> insert into salgrades values (1,  700,1200,   0);
1 row created.
SQL> insert into salgrades values (2, 1201,1400,  50);
1 row created.
SQL> insert into salgrades values (3, 1401,2000, 100);
1 row created.
SQL> insert into salgrades values (4, 2001,3000, 200);
1 row created.
SQL> insert into salgrades values (5, 3001,9999, 500);
1 row created.
SQL>
SQL>
SQL>
SQL> select e.ename           employee
  2  ,      12*e.msal+s.bonus total_salary
  3  from   employees e
  4  ,      salgrades s
  5  where  e.msal between s.lowerlimit
  6                    and s.upperlimit;
EMPLOYEE TOTAL_SALARY
-------- ------------
Jason            9600
Jerry           19300
Jord            20500
Mary            21700
Joe             22900
Black           24100
Red             25400
White           26600
Yellow          27800
Pink            29000
10 rows selected.
SQL>
SQL>
SQL> drop table employees;
Table dropped.
SQL>
SQL> drop table salgrades;
Table dropped.
SQL>


Join tables and order by columns from different tables

SQL>
SQL> create table employees(
  2    empno      NUMBER(4)
  3  , ename      VARCHAR2(8)
  4  , init       VARCHAR2(5)
  5  , job        VARCHAR2(8)
  6  , mgr        NUMBER(4)
  7  , bdate      DATE
  8  , msal       NUMBER(6,2)
  9  , comm       NUMBER(6,2)
 10  , deptno     NUMBER(2) ) ;
Table created.
SQL>
SQL>
SQL> insert into employees values(1,"Jason",  "N",  "TRAINER", 2,   date "1965-12-18",  800 , NULL,  10);
1 row created.
SQL> insert into employees values(2,"Jerry",  "J",  "SALESREP",3,   date "1966-11-19",  1600, 300,   10);
1 row created.
SQL> insert into employees values(3,"Jord",   "T" , "SALESREP",4,   date "1967-10-21",  1700, 500,   20);
1 row created.
SQL> insert into employees values(4,"Mary",   "J",  "MANAGER", 5,   date "1968-09-22",  1800, NULL,  20);
1 row created.
SQL> insert into employees values(5,"Joe",    "P",  "SALESREP",6,   date "1969-08-23",  1900, 1400,  30);
1 row created.
SQL> insert into employees values(6,"Black",  "R",  "MANAGER", 7,   date "1970-07-24",  2000, NULL,  30);
1 row created.
SQL> insert into employees values(7,"Red",    "A",  "MANAGER", 8,   date "1971-06-25",  2100, NULL,  40);
1 row created.
SQL> insert into employees values(8,"White",  "S",  "TRAINER", 9,   date "1972-05-26",  2200, NULL,  40);
1 row created.
SQL> insert into employees values(9,"Yellow", "C",  "DIRECTOR",10,  date "1973-04-27",  2300, NULL,  20);
1 row created.
SQL> insert into employees values(10,"Pink",  "J",  "SALESREP",null,date "1974-03-28",  2400, 0,     30);
1 row created.
SQL>
SQL>
SQL> create table departments
  2  ( deptno NUMBER(2)
  3  , dname  VARCHAR2(10)
  4  , location VARCHAR2(20)
  5  , mgr    NUMBER(4)
  6  ) ;
Table created.
SQL>
SQL> insert into departments values (10,"ACCOUNTING","NEW YORK" ,  2);
1 row created.
SQL> insert into departments values (20,"TRAINING",  "VANCOUVER",  3);
1 row created.
SQL> insert into departments values (30,"SALES",     "CHICAGO",    4);
1 row created.
SQL> insert into departments values (40,"HR",        "BOSTON",     5);
1 row created.
SQL>
SQL>
SQL> select d.deptno, d.location
  2  ,      e.ename, e.init
  3  from   employees e, departments d
  4  where  e.deptno = d.deptno
  5  order  by d.deptno, e.ename;
    DEPTNO LOCATION             ENAME    INIT
---------- -------------------- -------- -----
        10 NEW YORK             Jason    N
        10 NEW YORK             Jerry    J
        20 VANCOUVER            Jord     T
        20 VANCOUVER            Mary     J
        20 VANCOUVER            Yellow   C
        30 CHICAGO              Black    R
        30 CHICAGO              Joe      P
        30 CHICAGO              Pink     J
        40 BOSTON               Red      A
        40 BOSTON               White    S
10 rows selected.
SQL>
SQL>
SQL> drop table employees;
Table dropped.
SQL>
SQL> drop table departments;
Table dropped.
SQL>


Join two tables and combine three tables

SQL>
SQL>
SQL> create table salgrades
  2  ( grade      NUMBER(2)
  3  , lowerlimit NUMBER(6,2)
  4  , upperlimit NUMBER(6,2)
  5  , bonus      NUMBER(6,2)
  6  ) ;
Table created.
SQL>
SQL>
SQL> insert into salgrades values (1,  700,1200,   0);
1 row created.
SQL> insert into salgrades values (2, 1201,1400,  50);
1 row created.
SQL> insert into salgrades values (3, 1401,2000, 100);
1 row created.
SQL> insert into salgrades values (4, 2001,3000, 200);
1 row created.
SQL> insert into salgrades values (5, 3001,9999, 500);
1 row created.
SQL>
SQL>
SQL> create table employees(
  2    empno      NUMBER(4)
  3  , ename      VARCHAR2(8)
  4  , init       VARCHAR2(5)
  5  , job        VARCHAR2(8)
  6  , mgr        NUMBER(4)
  7  , bdate      DATE
  8  , msal       NUMBER(6,2)
  9  , comm       NUMBER(6,2)
 10  , deptno     NUMBER(2) ) ;
Table created.
SQL>
SQL>
SQL> insert into employees values(1,"Jason",  "N",  "TRAINER", 2,   date "1965-12-18",  800 , NULL,  10);
1 row created.
SQL> insert into employees values(2,"Jerry",  "J",  "SALESREP",3,   date "1966-11-19",  1600, 300,   10);
1 row created.
SQL> insert into employees values(3,"Jord",   "T" , "SALESREP",4,   date "1967-10-21",  1700, 500,   20);
1 row created.
SQL> insert into employees values(4,"Mary",   "J",  "MANAGER", 5,   date "1968-09-22",  1800, NULL,  20);
1 row created.
SQL> insert into employees values(5,"Joe",    "P",  "SALESREP",6,   date "1969-08-23",  1900, 1400,  30);
1 row created.
SQL> insert into employees values(6,"Black",  "R",  "MANAGER", 7,   date "1970-07-24",  2000, NULL,  30);
1 row created.
SQL> insert into employees values(7,"Red",    "A",  "MANAGER", 8,   date "1971-06-25",  2100, NULL,  40);
1 row created.
SQL> insert into employees values(8,"White",  "S",  "TRAINER", 9,   date "1972-05-26",  2200, NULL,  40);
1 row created.
SQL> insert into employees values(9,"Yellow", "C",  "DIRECTOR",10,  date "1973-04-27",  2300, NULL,  20);
1 row created.
SQL> insert into employees values(10,"Pink",  "J",  "SALESREP",null,date "1974-03-28",  2400, 0,     30);
1 row created.
SQL>
SQL>
SQL> create table departments
  2  ( deptno NUMBER(2)
  3  , dname  VARCHAR2(10)
  4  , location VARCHAR2(20)
  5  , mgr    NUMBER(4)
  6  ) ;
Table created.
SQL>
SQL> insert into departments values (10,"ACCOUNTING","NEW YORK" ,  2);
1 row created.
SQL> insert into departments values (20,"TRAINING",  "VANCOUVER",  3);
1 row created.
SQL> insert into departments values (30,"SALES",     "CHICAGO",    4);
1 row created.
SQL> insert into departments values (40,"HR",        "BOSTON",     5);
1 row created.
SQL>
SQL>
SQL>
SQL> select e.ename           employee
  2  ,      12*e.msal+s.bonus total_salary
  3  ,      d.dname           department
  4  from   employees   e
  5  ,      salgrades   s
  6  ,      departments d
  7  where  e.msal between s.lowerlimit
  8                    and s.upperlimit
  9  and    e.deptno = d.deptno;
EMPLOYEE TOTAL_SALARY DEPARTMENT
-------- ------------ ----------
Jason            9600 ACCOUNTING
Jerry           19300 ACCOUNTING
Jord            20500 TRAINING
Mary            21700 TRAINING
Joe             22900 SALES
Black           24100 SALES
Red             25400 HR
White           26600 HR
Yellow          27800 TRAINING
Pink            29000 SALES
10 rows selected.
SQL>
SQL> drop table salgrades;
Table dropped.
SQL>
SQL>
SQL> drop table employees;
Table dropped.
SQL>
SQL> drop table departments;
Table dropped.
SQL>


List table from two tables and specifying its column owner

SQL>
SQL>
SQL> create table employees(
  2    empno      NUMBER(4)
  3  , ename      VARCHAR2(8)
  4  , init       VARCHAR2(5)
  5  , job        VARCHAR2(8)
  6  , mgr        NUMBER(4)
  7  , bdate      DATE
  8  , msal       NUMBER(6,2)
  9  , comm       NUMBER(6,2)
 10  , deptno     NUMBER(2) ) ;
Table created.
SQL>
SQL>
SQL> insert into employees values(1,"Jason",  "N",  "TRAINER", 2,   date "1965-12-18",  800 , NULL,  10);
1 row created.
SQL> insert into employees values(2,"Jerry",  "J",  "SALESREP",3,   date "1966-11-19",  1600, 300,   10);
1 row created.
SQL> insert into employees values(3,"Jord",   "T" , "SALESREP",4,   date "1967-10-21",  1700, 500,   20);
1 row created.
SQL> insert into employees values(4,"Mary",   "J",  "MANAGER", 5,   date "1968-09-22",  1800, NULL,  20);
1 row created.
SQL> insert into employees values(5,"Joe",    "P",  "SALESREP",6,   date "1969-08-23",  1900, 1400,  30);
1 row created.
SQL> insert into employees values(6,"Black",  "R",  "MANAGER", 7,   date "1970-07-24",  2000, NULL,  30);
1 row created.
SQL> insert into employees values(7,"Red",    "A",  "MANAGER", 8,   date "1971-06-25",  2100, NULL,  40);
1 row created.
SQL> insert into employees values(8,"White",  "S",  "TRAINER", 9,   date "1972-05-26",  2200, NULL,  40);
1 row created.
SQL> insert into employees values(9,"Yellow", "C",  "DIRECTOR",10,  date "1973-04-27",  2300, NULL,  20);
1 row created.
SQL> insert into employees values(10,"Pink",  "J",  "SALESREP",null,date "1974-03-28",  2400, 0,     30);
1 row created.
SQL>
SQL>
SQL> create table departments
  2  ( deptno NUMBER(2)
  3  , dname  VARCHAR2(10)
  4  , location VARCHAR2(20)
  5  , mgr    NUMBER(4)
  6  ) ;
Table created.
SQL>
SQL> insert into departments values (10,"ACCOUNTING","NEW YORK" ,  2);
1 row created.
SQL> insert into departments values (20,"TRAINING",  "VANCOUVER",  3);
1 row created.
SQL> insert into departments values (30,"SALES",     "CHICAGO",    4);
1 row created.
SQL> insert into departments values (40,"HR",        "BOSTON",     5);
1 row created.
SQL>
SQL>
SQL>
SQL> select d.deptno, d.location, e.ename, e.init
  2  from   employees e, departments d;
    DEPTNO LOCATION             ENAME    INIT
---------- -------------------- -------- -----
        10 NEW YORK             Jason    N
        10 NEW YORK             Jerry    J
        10 NEW YORK             Jord     T
        10 NEW YORK             Mary     J
        10 NEW YORK             Joe      P
        10 NEW YORK             Black    R
        10 NEW YORK             Red      A
        10 NEW YORK             White    S
        10 NEW YORK             Yellow   C
        10 NEW YORK             Pink     J
        20 VANCOUVER            Jason    N
        20 VANCOUVER            Jerry    J
        20 VANCOUVER            Jord     T
        20 VANCOUVER            Mary     J
        20 VANCOUVER            Joe      P
        20 VANCOUVER            Black    R
        20 VANCOUVER            Red      A
        20 VANCOUVER            White    S
        20 VANCOUVER            Yellow   C
        20 VANCOUVER            Pink     J
        30 CHICAGO              Jason    N
        30 CHICAGO              Jerry    J
        30 CHICAGO              Jord     T
        30 CHICAGO              Mary     J
        30 CHICAGO              Joe      P
        30 CHICAGO              Black    R
        30 CHICAGO              Red      A
        30 CHICAGO              White    S
        30 CHICAGO              Yellow   C
        30 CHICAGO              Pink     J
        40 BOSTON               Jason    N
        40 BOSTON               Jerry    J
        40 BOSTON               Jord     T
        40 BOSTON               Mary     J
        40 BOSTON               Joe      P
        40 BOSTON               Black    R
        40 BOSTON               Red      A
        40 BOSTON               White    S
        40 BOSTON               Yellow   C
        40 BOSTON               Pink     J
40 rows selected.
SQL>
SQL> drop table employees;
Table dropped.
SQL>
SQL> drop table departments;
Table dropped.


List table from two tables without indicating column owner

SQL>
SQL> create table employees(
  2    empno      NUMBER(4)
  3  , ename      VARCHAR2(8)
  4  , init       VARCHAR2(5)
  5  , job        VARCHAR2(8)
  6  , mgr        NUMBER(4)
  7  , bdate      DATE
  8  , msal       NUMBER(6,2)
  9  , comm       NUMBER(6,2)
 10  , deptno     NUMBER(2) ) ;
Table created.
SQL>
SQL>
SQL> insert into employees values(1,"Jason",  "N",  "TRAINER", 2,   date "1965-12-18",  800 , NULL,  10);
1 row created.
SQL> insert into employees values(2,"Jerry",  "J",  "SALESREP",3,   date "1966-11-19",  1600, 300,   10);
1 row created.
SQL> insert into employees values(3,"Jord",   "T" , "SALESREP",4,   date "1967-10-21",  1700, 500,   20);
1 row created.
SQL> insert into employees values(4,"Mary",   "J",  "MANAGER", 5,   date "1968-09-22",  1800, NULL,  20);
1 row created.
SQL> insert into employees values(5,"Joe",    "P",  "SALESREP",6,   date "1969-08-23",  1900, 1400,  30);
1 row created.
SQL> insert into employees values(6,"Black",  "R",  "MANAGER", 7,   date "1970-07-24",  2000, NULL,  30);
1 row created.
SQL> insert into employees values(7,"Red",    "A",  "MANAGER", 8,   date "1971-06-25",  2100, NULL,  40);
1 row created.
SQL> insert into employees values(8,"White",  "S",  "TRAINER", 9,   date "1972-05-26",  2200, NULL,  40);
1 row created.
SQL> insert into employees values(9,"Yellow", "C",  "DIRECTOR",10,  date "1973-04-27",  2300, NULL,  20);
1 row created.
SQL> insert into employees values(10,"Pink",  "J",  "SALESREP",null,date "1974-03-28",  2400, 0,     30);
1 row created.
SQL>
SQL>
SQL> create table departments
  2  ( deptno NUMBER(2)
  3  , dname  VARCHAR2(10)
  4  , location VARCHAR2(20)
  5  , mgr    NUMBER(4)
  6  ) ;
Table created.
SQL>
SQL> insert into departments values (10,"ACCOUNTING","NEW YORK" ,  2);
1 row created.
SQL> insert into departments values (20,"TRAINING",  "VANCOUVER",  3);
1 row created.
SQL> insert into departments values (30,"SALES",     "CHICAGO",    4);
1 row created.
SQL> insert into departments values (40,"HR",        "BOSTON",     5);
1 row created.
SQL>
SQL>
SQL>
SQL> select deptno, location, ename, init
  2  from   employees, departments;
select deptno, location, ename, init
       *
ERROR at line 1:
ORA-00918: column ambiguously defined

SQL>
SQL> drop table employees;
Table dropped.
SQL>
SQL> drop table departments;
Table dropped.
SQL>


Reference column without table name during table join

SQL> CREATE TABLE emp
  2  (
  3     cid                NUMBER,
  4     city              VARCHAR2(30),
  5     customer_state             VARCHAR2(40),
  6     country_id                 CHAR(2)
  7  );
Table created.
SQL>
SQL> CREATE TABLE sales(
  2    product_id                NUMBER(6),
  3    cid               NUMBER,
  4    sold             NUMBER(3),
  5    amount                    NUMBER(10,2),
  6    cost                      NUMBER(10,2)
  7  );
Table created.
SQL>
SQL> select product_id, sold, city, customer_state
  2  from   sales, emp
  3  where  sales.cid = emp.cid
  4  and    product_id = 117;
no rows selected
SQL>
SQL>
SQL> drop table emp;
Table dropped.
SQL> drop table sales;
Table dropped.
SQL>


Supplying Table Aliases

The alias is specified in the FROM clause after each table name.

Table aliases make your queries more readable.



SQL> -- create demo table
SQL> create table Employee(
  2    EMPNO         NUMBER(3),
  3    ENAME         VARCHAR2(15 BYTE),
  4    HIREDATE      DATE,
  5    ORIG_SALARY   NUMBER(6),
  6    CURR_SALARY   NUMBER(6),
  7    REGION        VARCHAR2(1 BYTE)
  8  )
  9  /
Table created.
SQL>
SQL> create table job (
  2    EMPNO         NUMBER(3),
  3    jobtitle      VARCHAR2(20 BYTE)
  4  )
  5  /
Table created.
SQL>
SQL> insert into job (EMPNO, Jobtitle) values (1,"Tester");
1 row created.
SQL> insert into job (EMPNO, Jobtitle) values (2,"Accountant");
1 row created.
SQL> insert into job (EMPNO, Jobtitle) values (3,"Developer");
1 row created.
SQL> insert into job (EMPNO, Jobtitle) values (4,"COder");
1 row created.
SQL> insert into job (EMPNO, Jobtitle) values (5,"Director");
1 row created.
SQL> insert into job (EMPNO, Jobtitle) values (6,"Mediator");
1 row created.
SQL> insert into job (EMPNO, Jobtitle) values (7,"Proffessor");
1 row created.
SQL> insert into job (EMPNO, Jobtitle) values (8,"Programmer");
1 row created.
SQL> insert into job (EMPNO, Jobtitle) values (9,"Developer");
1 row created.
SQL>
SQL>
SQL> -- prepare data
SQL> insert into Employee(EMPNO,  EName,   HIREDATE,                       ORIG_SALARY,       CURR_SALARY,  REGION)
  2               values (1,      "Jason", to_date("19960725","YYYYMMDD"), 1234,              8767,         "E")
  3  /
1 row created.
SQL> insert into Employee(EMPNO,  EName,   HIREDATE,                       ORIG_SALARY,       CURR_SALARY,  REGION)
  2               values (2,      "John",  to_date("19970715","YYYYMMDD"), 2341,              3456,         "W")
  3  /
1 row created.
SQL> insert into Employee(EMPNO,  EName,   HIREDATE,                       ORIG_SALARY,       CURR_SALARY,  REGION)
  2               values (3,      "Joe",   to_date("19860125","YYYYMMDD"), 4321,              5654,         "E")
  3  /
1 row created.
SQL> insert into Employee(EMPNO,  EName,   HIREDATE,                       ORIG_SALARY,       CURR_SALARY,  REGION)
  2               values (4,      "Tom",   to_date("20060913","YYYYMMDD"), 2413,              6787,         "W")
  3  /
1 row created.
SQL> insert into Employee(EMPNO,  EName,   HIREDATE,                       ORIG_SALARY,       CURR_SALARY,  REGION)
  2               values (5,      "Jane",  to_date("20050417","YYYYMMDD"), 7654,              4345,         "E")
  3  /
1 row created.
SQL> insert into Employee(EMPNO,  EName,   HIREDATE,                       ORIG_SALARY,       CURR_SALARY,  REGION)
  2               values (6,      "James", to_date("20040718","YYYYMMDD"), 5679,              6546,         "W")
  3  /
1 row created.
SQL> insert into Employee(EMPNO,  EName,   HIREDATE,                       ORIG_SALARY,       CURR_SALARY,  REGION)
  2               values (7,      "Jodd",  to_date("20030720","YYYYMMDD"), 5438,              7658,         "E")
  3  /
1 row created.
SQL> insert into Employee(EMPNO,  EName,   HIREDATE,                       ORIG_SALARY,       CURR_SALARY,  REGION)
  2               values (8,      "Joke",  to_date("20020101","YYYYMMDD"), 8765,              4543,         "W")
  3  /
1 row created.
SQL> insert into Employee(EMPNO,  EName,   HIREDATE,                       ORIG_SALARY,       CURR_SALARY,  REGION)
  2               values (9,      "Jack",  to_date("20010829","YYYYMMDD"), 7896,              1232,         "E")
  3  /
1 row created.
SQL>
SQL>
SQL>
SQL> -- display data in the table
SQL> select * from Employee
  2  /
     EMPNO ENAME           HIREDATE  ORIG_SALARY CURR_SALARY R
---------- --------------- --------- ----------- ----------- -
         1 Jason           25-JUL-96        1234        8767 E
         2 John            15-JUL-97        2341        3456 W
         3 Joe             25-JAN-86        4321        5654 E
         4 Tom             13-SEP-06        2413        6787 W
         5 Jane            17-APR-05        7654        4345 E
         6 James           18-JUL-04        5679        6546 W
         7 Jodd            20-JUL-03        5438        7658 E
         8 Joke            01-JAN-02        8765        4543 W
         9 Jack            29-AUG-01        7896        1232 E
9 rows selected.
SQL> select * from job
  2  /
     EMPNO JOBTITLE
---------- --------------------
         1 Tester
         2 Accountant
         3 Developer
         4 COder
         5 Director
         6 Mediator
         7 Proffessor
         8 Programmer
         9 Developer
9 rows selected.
SQL>
SQL>
SQL> SELECT e.ename, j.jobtitle FROM employee e, job j
  2  WHERE e.empno = j.empno;
ENAME           JOBTITLE
--------------- --------------------
Jason           Tester
John            Accountant
Joe             Developer
Tom             COder
Jane            Director
James           Mediator
Jodd            Proffessor
Joke            Programmer
Jack            Developer
9 rows selected.
SQL>
SQL>
SQL>
SQL> -- clean the table
SQL> drop table Employee
  2  /
Table dropped.
SQL> drop table job
  2  /
Table dropped.
SQL>


Use * to reference all columns from a table

SQL>
SQL> CREATE TABLE EMP (EMPNO NUMBER(4) NOT NULL,
  2                    ENAME VARCHAR2(10),
  3                    JOB VARCHAR2(9),
  4                    MGR NUMBER(4),
  5                    HIREDATE DATE,
  6                    SAL NUMBER(7, 2),
  7                    COMM NUMBER(7, 2),
  8                    DEPTNO NUMBER(2));

SQL>
SQL> INSERT INTO EMP VALUES (7369, "SMITH", "CLERK",    7902, TO_DATE("17-DEC-1980", "DD-MON-YYYY"), 800, NULL, 20);
1 row created.
SQL> INSERT INTO EMP VALUES (7499, "ALLEN", "SALESMAN", 7698, TO_DATE("20-FEB-1981", "DD-MON-YYYY"), 1600, 300, 30);
1 row created.
SQL> INSERT INTO EMP VALUES (7521, "WARD",  "SALESMAN", 7698, TO_DATE("22-FEB-1981", "DD-MON-YYYY"), 1250, 500, 30);
1 row created.
SQL> INSERT INTO EMP VALUES (7566, "JONES", "MANAGER",  7839, TO_DATE("2-APR-1981",  "DD-MON-YYYY"), 2975, NULL, 20);
1 row created.
SQL> INSERT INTO EMP VALUES (7654, "MARTIN", "SALESMAN", 7698,TO_DATE("28-SEP-1981", "DD-MON-YYYY"), 1250, 1400, 30);
1 row created.
SQL> INSERT INTO EMP VALUES (7698, "BLAKE", "MANAGER", 7839,TO_DATE("1-MAY-1981", "DD-MON-YYYY"), 2850, NULL, 30);
1 row created.
SQL> INSERT INTO EMP VALUES (7782, "CLARK", "MANAGER", 7839,TO_DATE("9-JUN-1981", "DD-MON-YYYY"), 2450, NULL, 10);
1 row created.
SQL> INSERT INTO EMP VALUES (7788, "SCOTT", "ANALYST", 7566,TO_DATE("09-DEC-1982", "DD-MON-YYYY"), 3000, NULL, 20);
1 row created.
SQL> INSERT INTO EMP VALUES (7839, "KING", "PRESIDENT", NULL,TO_DATE("17-NOV-1981", "DD-MON-YYYY"), 5000, NULL, 10);
1 row created.
SQL> INSERT INTO EMP VALUES (7844, "TURNER", "SALESMAN", 7698,TO_DATE("8-SEP-1981", "DD-MON-YYYY"), 1500, 0, 30);
1 row created.
SQL> INSERT INTO EMP VALUES (7876, "ADAMS", "CLERK", 7788,TO_DATE("12-JAN-1983", "DD-MON-YYYY"), 1100, NULL, 20);
1 row created.
SQL> INSERT INTO EMP VALUES (7900, "JAMES", "CLERK", 7698,TO_DATE("3-DEC-1981", "DD-MON-YYYY"), 950, NULL, 30);
1 row created.
SQL> INSERT INTO EMP VALUES (7902, "FORD", "ANALYST", 7566,TO_DATE("3-DEC-1981", "DD-MON-YYYY"), 3000, NULL, 20);
1 row created.
SQL> INSERT INTO EMP VALUES (7934, "MILLER", "CLERK", 7782,TO_DATE("23-JAN-1982", "DD-MON-YYYY"), 1300, NULL, 10);
1 row created.
SQL>
SQL> CREATE TABLE DEPT (DEPTNO NUMBER(2),DNAME VARCHAR2(14),LOC VARCHAR2(13) );
Table created.
SQL>
SQL> INSERT INTO DEPT VALUES (10, "ACCOUNTING", "NEW YORK");
1 row created.
SQL> INSERT INTO DEPT VALUES (20, "RESEARCH", "DALLAS");
1 row created.
SQL> INSERT INTO DEPT VALUES (30, "SALES", "CHICAGO");
1 row created.
SQL> INSERT INTO DEPT VALUES (40, "OPERATIONS", "BOSTON");
1 row created.
SQL>
SQL>
SQL> select dept.*, empno, ename, job, mgr, hiredate, sal, comm
  2  from emp, dept
  3  where emp.deptno = dept.deptno
  4  and dept.deptno = 10
  5  /

    DEPTNO DNAME          LOC                EMPNO ENAME      JOB
---------- -------------- ------------- ---------- ---------- ---------
       MGR HIREDATE         SAL       COMM
---------- --------- ---------- ----------
        10 ACCOUNTING     NEW YORK            7782 CLARK      MANAGER
      7839 09-JUN-81       2450
        10 ACCOUNTING     NEW YORK            7839 KING       PRESIDENT
           17-NOV-81       5000
        10 ACCOUNTING     NEW YORK            7934 MILLER     CLERK
      7782 23-JAN-82       1300
        10 ACCOUNTING     NEW YORK            7782 CLARK      MANAGER
      7839 09-JUN-81       2450
        10 ACCOUNTING     NEW YORK            7839 KING       PRESIDENT
           17-NOV-81       5000
        10 ACCOUNTING     NEW YORK            7934 MILLER     CLERK
      7782 23-JAN-82       1300

6 rows selected.
SQL> drop table emp;
Table dropped.
SQL>
SQL> drop table dept;
Table dropped.
SQL>