postgres add foreign key to existing table
ALTER TABLE tblA ADD COLUMN colA VARCHAR(10); /* 1st add column */
ALTER TABLE tblA ADD CONSTRAINT colA /* Make colA on tblA a foreign key */
FOREIGN KEY (colA) REFERENCES tblB (colB); /* colB must be a pk on tblB*/postgres add foreign key alter table
CREATE TABLE orders (
order_id SERIAL,
dish_name TEXT,
customer_id INTEGER REFERENCES customers (id)
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