UPDATE Terrain_YieldChanges SET YieldChange =Round(YieldChange + 2, 0) WHERE YieldType ='YIELD_PRODUCTION';
INSERT INTO Terrain_YieldChanges (TerrainType, YieldType, YieldChange) VALUES
('TERRAIN_GRASS', 'YIELD_PRODUCTION', '2'),
('TERRAIN_TUNDRA', 'YIELD_PRODUCTION', '2'),
('TERRAIN_DESERT', 'YIELD_PRODUCTION', '2'),
('TERRAIN_COAST', 'YIELD_PRODUCTION', '2'),
('TERRAIN_OCEAN', 'YIELD_PRODUCTION', '2'),
('TERRAIN_SNOW', 'YIELD_PRODUCTION', '2');