@tmxx=‘’中@ 以及‘’是什么意思

Question

select @otherregid = max(adve_regid)

from t_zy_adv_real_exec(nolock)

where (@tmxx = '' or barcode = @tmxx)
and datediff(day,adve_date,getdate()) <=3 and adve_regid = @regid

Answer 1

那应该是个参数，远出值后，付给它