Update a subquery : Update « Insert Update Delete « Oracle PL/SQL Tutorial






  1. Oracle PL/SQL Tutorial
  2. Insert Update Delete
  3. Update
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> 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> update ( select e.msal
  2           from   employees   e join
  3                  departments d using (deptno)
  4           where  location = 'DALLAS')
  5  set msal = msal + 1;
set msal = msal + 1
    *
ERROR at line 5:
ORA-01779: cannot modify a column which maps to a non key-preserved table


SQL>
SQL> drop table employees;

Table dropped.

SQL>
SQL> drop table departments;

Table dropped.

SQL>








4.3.Update
4.3.1.Modifying Rows Using the UPDATE Statement
4.3.2.Change more than one column value in update statement
4.3.3.If the WHERE clause were omitted, all the rows would be updated.
4.3.4.Change multiple rows and multiple columns in the same UPDATE statement
4.3.5.Use function in set clause
4.3.6.Writing an UPDATE Statement Containing a Subquery
4.3.7.Use TO_DATE('December 31, 2005, 11:30 P.M.','Month dd, YYYY, HH:MI P.M.') in update statement
4.3.8.Set clause with math expression
4.3.9.Update with subquery
4.3.10.Update a subquery
4.3.11.Set value based on a select statement
4.3.12.Change department name to lower case
4.3.13.Update data from existing column
4.3.14.Update four columns
4.3.15.Update one row
4.3.16.Update salary based on average salary
4.3.17.Update the emp table, converting emp names to uppercase
4.3.18.subquery in update statement
4.3.19.To update the salary of all emps to the maximum salary in the corresponding department (correlated subquery):