Answer / saraswathi muthuraman

Oracle will have a default table called 'DUAL'.
Dual table will have only one column "DUMMY". U cann't
insert values into dual table. By default, a row will
existing in dual table.

SQL> desc dual;
DUMMY varchar2(1)

SQL> select * from dual;

X

1 row selected.

SQL> insert into dual values (10);
insert into dual values (10)
*
ERROR at line 1:
ORA-01031: insufficient privileges


U can create you own table with the name of dual.

SQL> create table dual(xy number,zz number);

Table created.

SQL> desc dual;
xy number
zz number

u can insert values in you own dual table.

Answer / eshwari

Dual table is a sample permanent table which come along with
oracle.
for example if u want to knw the sin(45) value then u have
to retreave it from a table.but there is no table to
retreave that value.
so we use the sample table dual as table name in place of
table name in the select query.

ex:select sin(45) from dual;

How to use group functions in the select clause using oracle?

0 Answers  

---

Hi Can any one tell me what are the API's used in requisition import.

0 Answers  

---

How to turn on or off recycle bin for the session?

0 Answers  

---

Does oracle partitioning improve performance?

0 Answers  

---

How to pass a cursor variable to a procedure?

0 Answers  

---

What is the usage of merge statement?

0 Answers  

---

Use of an integrity constraint is better to validate data. Explain

0 Answers  

---

What is RULE-based approach to optimization ?

1 Answers  

---

How to use windows user to connect to the server?

0 Answers  

---

Can multiple cursors being opened at the same time?

0 Answers  

---

What is a partition in oracle?

0 Answers  

---

which sql command we can use to get a print out from oracle?

2 Answers   iFlex, INDUS,

---