UNIQUE / DISTINCT : UNIQUE « Select Query « Oracle PL / SQL

1. Oracle PL / SQL
2. Select Query
3. UNIQUE

UNIQUE / DISTINCT

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

Table created.

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

1 row created.

SQL> INSERT INTO purchase VALUES ('B',   75, '14-JUL-03', 'BB');

1 row created.

SQL> INSERT INTO purchase VALUES ('C',   2,  '14-JUL-03', 'GA');

1 row created.

SQL> INSERT INTO purchase VALUES ('D',   8,  '15-JUL-03', 'GA');

1 row created.

SQL> INSERT INTO purchase VALUES ('A',   20, '15-JUL-03', 'LB');

1 row created.

SQL> INSERT INTO purchase VALUES ('B',   2,  '16-JUL-03', 'CA');

1 row created.

SQL> INSERT INTO purchase VALUES ('C',   25, '16-JUL-03', 'LB');

1 row created.

SQL> INSERT INTO purchase VALUES ('D',   2,  '17-JUL-03', 'BB');

1 row created.

SQL>
SQL> SELECT UNIQUE product_name
  2  FROM          purchase
  3  ORDER BY      product_name;

PRODUCT_NAME
-------------------------
A
B
C
D

4 rows selected.

SQL>
SQL> SELECT Distinct product_name
  2  FROM          purchase
  3  ORDER BY      product_name;

PRODUCT_NAME
-------------------------
A
B
C
D

4 rows selected.

SQL>
SQL>
SQL> DROP TABLE purchase;

Table dropped.

SQL>

 

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