这个语句有什么问题,请大家帮忙看看!!给50分
sql="SELECT month(receive.sgsj) as month,sum(case when zrrd.fc1='未填' or zrrd.fc1='为空' then 0 else 1 end) as fc1 FROM zrrd INNER JOIN receive ON receive.ajbh=zrrd.ajbh WHERE year(receive.sgsj)='"&year&"' AND receive.cjr='"&cjr&"' group by month(receive.sgsj)"