- clear
- import excel "d:\BB.xlsx", sheet("Sheet1") case(lower) firstrow clear
- des
- tempfile master_data using_data
- preserve
- keep daima bpftn
- drop if daima==.
- duplicates list bpftn /*存在重复的,相同bpftn但代码是不同的,这是不对的*/
- save "`master_data'"
- restore
- keep bcont
- drop if bcont==""
- gen bpftn=bcont
- save "`using_data'"
- *由于bpftn里面有重复的,所以下面只能用m:1.但这样是有问题的,应该是1:1才是正确
- use "`master_data'",clear
- merge m:1 bpftn using "`using_data'"


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