The dual Table : dual « Introduction « Oracle PL/SQL Tutorial

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Oracle PL/SQL Tutorial » Introduction » dual

1. 1. 1. The dual Table

dual is a table that contains a single row.
The dual table has one VARCHAR2 column named dummy.
dual contains a single row with the value X.

The structure of the dual table:


SQL>

SQL> DESCRIBE dual;

 Name         Null?    Type

 DUMMY                 VARCHAR2(1)


SQL> SELECT * FROM dual;



D

-

X



SQL>

1. 1. dual
	1. 1. 1.	The dual Table
	1. 1. 2.	Do simple calculation by using dual

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