Unique Constraint Violation

[trinanjan]

Why Unique Constraint Violation Takes Place In Oracle? How This Problen Can Be Solved?

[amitpatel66]

Why Unique Constraint Violation Takes Place In Oracle? How This Problen Can Be Solved?

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[amitpatel66]

Why Unique Constraint Violation Takes Place In Oracle? How This Problen Can Be Solved?

Unique Constraint violation takes place when you try to insert a same value in a particular column that already exists.

Check this:

[code=oracle]
SQL> create table abcd(a NUMBER UNIQUE);

Table created.

SQL> insert into abcd values(1);

1 row created.

SQL> /
insert into abcd values(1)
*
ERROR at line 1:
ORA-00001: unique constraint (APPS.SYS_C0015 7910) violated


SQL> ed
Wrote file afiedt.buf

1* insert into abcd values(NULL)
SQL> /

1 row created.

SQL> /

1 row created.

SQL> /

1 row created.

SQL>

[/code]

Any number of NULLS can be inserted but not the same value.

[debasisdas]

Why Unique Constraint Violation Takes Place In Oracle? How This Problen Can Be Solved?

It occurs to maintain data integrity .
To solve this u need to check for existance of data in a unique / Primay key field before inserting or updating the records.