比如，通过ID 变量来合并两个数据，主数据的ID是1、1、2、3、3、4，调用数据的ID是1、2、3、4、5、6、7、8、9。这时候应该怎么写，用merge ID using using_filename，为什么结果显示variable ID does not uniquely identify observations in the master data
Please type "help merge".
There are many kinds in merge.
In your question, you have two "1" in master data but only one in using data. You could keep only one "1" in your master data by using "duplicates drop ..." and then merge them,if you don't want to delete it in master data, you may use "merge m:1"
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