> table3<-fread("D:\\a.csv")
> table4<-fread("D:\\b.csv")
> databind<-merge(table3,table4,by="SFZH",all=FALSE)
Error in bmerge(i, x, leftcols, rightcols, roll, rollends, nomatch, mult,  :
  Incompatible join types: i.SFZH is type integer64 but x.SFZH is type double and contains fractions
> as.character(table3$SFZH)
[1] "110000000000000000" "110000000000000000" "110000000000000000"
> as.character(table4$SFZH)
[1] "1.1e+17" "1.1e+17" "1.1e+17"
> databind<-merge(table3,table4,by="SFZH",all=FALSE)
Error in bmerge(i, x, leftcols, rightcols, roll, rollends, nomatch, mult,  :
  Incompatible join types: i.SFZH is type integer64 but x.SFZH is type double and contains fractions