1. CREATE TABLE names (the_id SERIAL PRIMARY KEY, the_name text); CREATE UNIQUE INDEX uidx_thename ON names(the_name);
vs.
2. CREATE TABLE names (the_id SERIAL PRIMARY KEY, the_name text UNIQUE);
Is the UNIQUE constraint in the second solution merely short-hand for the explicit
index declaration of the first solution? Or is there a functional difference between
them that I should choose between?
Thanks again! Scott
On Dec 1, 2004, at 10:11 AM, Scott Frankel wrote:
I want to ensure data integrity when inserting into a table, preventing multiple
entries of identical rows of data.
Does this call for using a trigger?
How would triggers perform a query to test if data already exists in the table?
(The doco outlines how triggers perform tests on NEW data inserted into a
table; but I haven't found anything on data already extant.)
Thanks in advance! Scott
sample table:
CREATE TABLE names (the_id SERIAL PRIMARY KEY, the_name text);
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