Multiple key error .

[Brahmam Eswar <brahmam1234@xxxxxxxxx>]

Unable to add multiple keys to the table.

ALTER TABLE table1 ADD CONSTRAINT Table1_PK PRIMARY KEY (Col1,Col2);

ERROR:  multiple primary keys for table "table1" are not allowed

SQL state: 42P16

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Thanks & Regards,
Brahmeswara Rao J.