如题，主表是A汇总表，想要合并进去的表是B股票代码与股票收益率，结果提示错误
. merge 1:1  stock using  "inv-2015年股票收益率ret.dta",
variable date is str10 in master but int in using data
    You could specify merge's force option to ignore this string/numeric
    mismatch.  The using variable would then be treated as if it contained
    "".
r(106);