How to declare a key as unique after table is created

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I have written below statement to declare my IFSC_CODE as unique, but below statement do not allow to declare it.

If anyone has solution please help me.

SQL

ALTER TABLE bank_master
add CONSTRAINT Ifsc_Code_unique UNIQUE (IFSC_CODE);

Posted 14-Aug-13 0:05am

Member 9410081

Updated 14-Aug-13 0:16am

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ)

v2

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Mukesh Ghosh 14-Aug-13 6:09am

What kind of error you are getting?

Member 9410081 14-Aug-13 6:22am

ORA-02299: cannot validate (TICL_NBFC.IFSC_CODE_UNIQUE) - duplicate keys found

4 solutions

Solution 4

Try this.. :)

SQL

ALTER TABLE bank_master
ADD UNIQUE (IFSC_CODE);

Posted 14-Aug-13 0:35am

Member 10209018

Updated 14-Aug-13 0:48am

v2

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Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) · Accepted Answer · 2013-08-14T00:33:00

Solution 1

From the Exception, it is quite clear that the Column already have duplicate values in it.
As you are altering the Table and making the Column UNIQUE, so it is violating.

If you want to make it UNIQUE, then try after removing the duplicate entries.

Posted 14-Aug-13 0:33am

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ)

Deviprasad Das · Accepted Answer · 2013-08-14T00:34:00

Solution 2

Here you are trying to create a Unique constraint.

Try creating a Non-unique index with a unique constraint and see if it works.

Posted 14-Aug-13 0:34am

Deviprasad Das

kishore sharma · Accepted Answer · 2013-08-14T00:34:00

After reading all the comments and your query to alter the constraint and trying from my end.
I can say that the table which you are using is already having data (duplicate data)
and as per Unique key constraint all the values entered in that column must be unique
Null is also is unique but Null also can not be entered more than once.
So i would suggest you delete all duplicate entries for that column and try.

Good luck