Eind druk / Start DrukNummer

Error in query SELECT if (tnk_PressureUnit = 'Bar', round(gsu_PressureStart,0) , round(gsu_PressureStart * 0.0689475729, 0)) as StartPressure, if (tnk_PressureUnit = 'Bar', round(gsu_PressureEnd,0) , round(gsu_PressureEnd * 0.0689475729, 0)) as EndPressure, count(distinct div_ID) as Number FROM udlTanks, udlGasUsed WHERE udlGasUsed.usr_ID = 340 AND udlTanks.tnk_ID = udlGasUsed.tnk_ID GROUP BY gsu_PressureStart, gsu_PressureEnd