Hello.
This is simple example for describe my problem.
I created a table:
CREATE TABLE table0
(
id serial NOT NULL,
field0 integer,
field1 text
);
I created an unique index for this table:
CREATE UNIQUE INDEX idx_table0_unique
ON table0 ( field0, coalesce ( field1, 'INDEX_COLUMN_NULL' ) );
I created function for insert only unique record (part of code):
BEGIN
INSERT INTO table0 ( field0, field1 ) VALUES ( p_field0, p_field1 )
RETURNING id INTO v_table0_id;
EXCEPTION WHEN unique_violation THEN
SELECT id FROM table0 WHERE field0 = p_field0 AND field1 = p_field1;
END;
I use this function for add data to table and sometimes I getting false
unique violation (in block above). Why?
Thanks for replay.
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