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Unique case insensitive constraint in oracle database

The more efficient approach is the first approach. It's more efficient, though, only because the latter syntax doesn't work. You cannot, unfortunately, create a function-based constraint in the same way that you can create a unique index.

A unique constraint doesn't work

SQL> create table person (
  2    first_name varchar2(10),
  3    last_name  varchar2(10)
  4  );

Table created.

  2  UNIQUE(LOWER(first_name),LOWER(last_name));
ERROR at line 2:
ORA-00904: : invalid identifier

A unique function-based index, however, does work

SQL> create unique index
  2      on person( lower(first_name),
lower(last_name) );

Index created.

Categories : Oracle

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