If you want a unique key across several tables, can you not do something
like:
CREATE SEQUENCE detail_seq INCREMENT BY 1;
CREATE TABLE table1 (
table1_id INTEGER PRIMARY KEY DEFAULT nextval('detail_seq'),
item1_name VARCHAR(100) NOT NULL
);
CREATE TABLE table2 (
table2_id INTEGER PRIMARY KEY DEFAULT nextval('detail_seq'),
item2_name VARCHAR(100) NOT NULL
);
Then the union of both tables will contain one unique set of ids.
Assuming that is what you are trying to do, that is.
Susan
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