请教关于横向合并的问题

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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

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关键词：主数据

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"

ritaing 发表于 2018-10-25 22:54
Please type "help merge".
There are many kinds in merge.
In your question, you have two "1" in mas ...

谢谢，已解决