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public sql v1 · immutableSELECT DISTINCT g1.adgroup FROM table g1 WHERE price=(SELECT MIN(g2.price) FROM table g2 WHERE g1.adgroup = g2.adgroup) AND campaign = 'Milan'SELECT DISTINCT g1.adgroup FROM table g1 WHERE price=(SELECT MIN(g2.price) FROM table g2 WHERE g1.adgroup = g2.adgroup) AND campaign = 'Milan'