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






  1. Oracle PL/SQL Tutorial
  2. Insert Update Delete
  3. Update
SQL> CREATE TABLE product (
  2       product_name     VARCHAR2(25) PRIMARY KEY,
  3       product_price    NUMBER(4,2),
  4       quantity_on_hand NUMBER(5,0),
  5       last_stock_date  DATE
  6       );

Table created.

SQL>
SQL> CREATE TABLE product_order (
  2       product_name  VARCHAR2(25),
  3       salesperson   VARCHAR2(3),
  4       order_date DATE,
  5       quantity      NUMBER(4,2)
  6       );

Table created.

SQL>
SQL>
SQL> INSERT INTO product_order VALUES ('Product 1', 'CA', '14-JUL-03', 1);

1 row created.

SQL> INSERT INTO product_order VALUES ('Product 2', 'BB', '14-JUL-03', 75);

1 row created.

SQL> INSERT INTO product_order VALUES ('Product 3', 'GA', '14-JUL-03', 2);

1 row created.

SQL> INSERT INTO product_order VALUES ('Product 4', 'GA', '15-JUL-03', 8);

1 row created.

SQL> INSERT INTO product_order VALUES ('Product 5', 'LB', '15-JUL-03', 20);

1 row created.

SQL> INSERT INTO product_order VALUES ('Product 6', 'CA', '16-JUL-03', 5);

1 row created.

SQL> INSERT INTO product_order VALUES ('Product 7', 'CA', '17-JUL-03', 1);

1 row created.

SQL>
SQL>
SQL> INSERT INTO product VALUES ('Product 1', 99,  1,    '15-JAN-03');

1 row created.

SQL> INSERT INTO product VALUES ('Product 2', 75,  1000, '15-JAN-02');

1 row created.

SQL> INSERT INTO product VALUES ('Product 3', 50,  100,  '15-JAN-03');

1 row created.

SQL> INSERT INTO product VALUES ('Product 4', 25,  10000, null);

1 row created.

SQL> INSERT INTO product VALUES ('Product 5', 9.95,1234, '15-JAN-04');

1 row created.

SQL> INSERT INTO product VALUES ('Product 6', 45,  1,    TO_DATE('December 31, 2008, 11:30 P.M.','Month dd, YYYY, HH:MI P.M.'));

1 row created.

SQL>
SQL> select * from product;

PRODUCT_NAME              PRODUCT_PRICE QUANTITY_ON_HAND LAST_STOC
------------------------- ------------- ---------------- ---------
Product 1                            99                1 15-JAN-03
Product 2                            75             1000 15-JAN-02
Product 3                            50              100 15-JAN-03
Product 4                            25            10000
Product 5                          9.95             1234 15-JAN-04
Product 6                            45                1 31-DEC-08

6 rows selected.

SQL>
SQL>
SQL> UPDATE product
  2  SET    product_price = product_price * .9
  3  WHERE  product_name NOT IN (SELECT DISTINCT product_name FROM product_order);

0 rows updated.

SQL>
SQL> select * from product;

PRODUCT_NAME              PRODUCT_PRICE QUANTITY_ON_HAND LAST_STOC
------------------------- ------------- ---------------- ---------
Product 1                            99                1 15-JAN-03
Product 2                            75             1000 15-JAN-02
Product 3                            50              100 15-JAN-03
Product 4                            25            10000
Product 5                          9.95             1234 15-JAN-04
Product 6                            45                1 31-DEC-08

6 rows selected.

SQL>
SQL> drop table product;

Table dropped.

SQL> drop table product_order;

Table dropped.

SQL>
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):