newbie questions - Mailing list pgsql-admin

Are there the following SQL commands in psotgreSQL?

ALTER TABLE CATALOGITEM_LNK ADD
  CONSTRAINT PK_CATALOGITEM_LNK PRIMARY KEY(catalogid,
itemid);

ALTER TABLE CATALOGITEM_LNK ADD
  CONSTRAINT FK_CATALOGITEM_LNK_CATALOG FOREIGN KEY
  (catalogid) REFERENCES CATALOG(id);


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