I want to ensure data integrity when inserting into a table, preventing multiple
entries of identical rows of data.
Just use a unique index on the columns you want to make sure are not duplicated.
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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TIP 9: the planner will ignore your desire to choose an index scan if your
joining column's datatypes do not match
