VARCHAR references

I have a problem with the insert form for table
eq_list. PostdgeQSL enforces the constraint on v_id
and will not allow record to be inserted unless the
the v_id exist in the vendor table

However for reason I do not understand PostgreSQL is
not enforcing the constraint that the proj_id exist
in the project table ????

I tried to check the table design but could not find a
command in psql that detail foreign keys or other
constraints. How can I display table constraints????

I created the table with the following file

CREATE TABLE eq_list (
eq_id VARCHAR(10) PRIMARY KEY,
description VARCHAR(128),
v_id INT4 REFERENCES vendor,
rate NUMERIC(8,2),
proj_id VARCHAR(10) REFERENCES project,
in_service BOOL DEFAULT 't'
);

Thanks,
Justin

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My web page is at: http://www.seiferth-ryan.com

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