On Thu, Jun 02, 2005 at 20:22:07 +0100,
Mauro Delfino <maurodelfino(at)gmail(dot)com> wrote:
> I have the these two tables:
> CREATE TABLE table_one
> ( field1 VARCHAR(255) );
> CREATE TABLE table_two
> ( field1 VARCHAR(255) UNIQUE );
> table_one has 500k records. I certify that all strings are distinct with
> this query:
> SELECT DISTINCT field1 FROM table_one;
> The query results 500k rows.
> But if I try to insert the records of table_one into table_two with the
> following command:
> INSERT INTO table_two (field1) (SELECT field1 FROM table_one);
> This error occurs:
> ERROR: duplicate key violates unique constraint "table_two_field1_key"
> What happened? DISTINC and UNIQUE have different algorithms to determine
> when two strings are equal?
Are you sure table_two is empty when you do this?
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