Greetings, I have a question about foreign key cost. I have two tables A and B. A has 300,000 records, B has 3 records. A (col1, col2, col3... ... colN) B (colB1 primary key, colB2) I'd like to setup foreign key constraint for A.col3, as the following: CONSTRAINT Aclo3_fk FOREIGN KEY (col3) REFERENCES B(colB1) But I got a warning msg from postgresql as: foreign key constraint "Aclo3_fk" will require costly sequential scans Some comments about it? Thanks a lot! Emi ---------------------------(end of broadcast)--------------------------- TIP 6: explain analyze is your friend
