Primary key for the case in (NVARCHAR2 datatype) in Oracle 10 g

I have primary keys in my database which are of type NVARCHAR2. By default, the data is inserted in these columns as case sensitive, which means the insertion of these two 'ABCD' and 'Abcd' is allowed.

Can I change the settings in Oracle so that primary keys are working in sensitive cases? I tried Oracle to raise an error if someone is inserting "Abcd" and if there is already a record with primary key 'ABCD '.

Note: I use Entity Framework.

The simplest approach is probably to create a unique index on the UPPER (your_key) function, i.e.

CREATE UNIQUE INDEX case_insensitive
    ON table_name ( UPPER( key_column_name ) );

If you want to replace the queries to be case-sensitive, so, you can change the NLS_COMP and NLS_SORT for each session and create all your index with these NLS settings by default, but that complicates life in general.

Either said by the way, do you really need to use the NVARCHAR2 data type? Your really using characters that cannot be represented in your character of database primary keys are defined?

Justin

Tags: Database

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