ORA-02270: no matching unique or primary key for this
column-list
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Answer Posted / pauline wan
You tried to reference a table using a unique key, but the
column that you listed only have unique index instead of
unique constraint. For example, referenced table called A
has PK column a1, another column a2, a2 has unique index
but not unique constraint, child table B has PK column b1
and another column b2. Now if you want to add FK on
table B column b2 which references table A column a2, you
will get ORA-02270.
To solve the problem, you need to drop unique index on
table A column a2 and create unique constraint on table A
column a2, then add FK on table B column b2.
The tricky is unique index has same functionality as unique
constraint which uniquely identify the data on the column,
but it doesn't have information in user_constraints,
all_constraints,dba_constraints.
| Is This Answer Correct ? | 8 Yes | 3 No |
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