security-admin/db/postgres/patches/033-add-unique-constraint-on-table-x_policy.sql

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--     http://www.apache.org/licenses/LICENSE-2.0
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select 'delimiter start';
CREATE OR REPLACE FUNCTION create_unique_constraint_on_policyname()
RETURNS void AS $$
DECLARE
	v_attnum integer := 0;
BEGIN
	select attnum into v_attnum from pg_attribute where attrelid in(select oid from pg_class where relname='x_policy') and attname in('name');
	IF v_attnum > 0 THEN
		IF not exists (select * from pg_constraint where conrelid in(select oid from pg_class where relname='x_policy') and conname='x_policy_uk_name_service' and contype='u') THEN
			IF not exists (select * from pg_index where indrelid in(select oid from pg_class where relname='x_policy') and indkey[0]=v_attnum) THEN
				UPDATE x_policy set name=(name || '-duplicate-' || id) where id in (select id from (select id from x_policy where service || name in (select service || name from x_policy group by service,name having count(*) >1)) as tmp);
				ALTER TABLE x_policy ADD CONSTRAINT x_policy_uk_name_service UNIQUE(name,service);
			END IF;
		END IF;
	END IF;

END;
$$ LANGUAGE plpgsql;
select create_unique_constraint_on_policyname();
select 'delimiter end';