无法绑定多部分标识符

Question

select (case when t.freeplayabandoned != f.freeplayabandoned then 'freeplayabandoned'
             when t.freeplaydownloaded != f.freeplaydownloaded then 'freeplaydownloaded'
    end) 
from testtable t where not exists (select * from freeplay.egmfreeplay f  where f.freeplaydownloaded  = t.freeplaydownloaded)

我试图得到testtable记录的列名与freeplay.egmfreeplay的列名不匹配

并且我得到错误以下错误

消息4104,级别16,状态1,行1无法绑定多部分标识符"f.freeplayabandoned".消息4104,级别16,状态1,行1无法绑定多部分标识符"f.freeplaydownloaded".

有人可以帮忙吗？

Answer 1

f在调用存在的子查询内部作用域.您不能在子查询之外使用它.