Join on the issue Join the two documents can be classified based on the key fields into a document, I would like to ask a question, the two documents to determine if a line can only record would be linked to join ah? Sample : File1 Department id name addree File2 Id information department Id is for the plots under the same department, the department must be, id is the only key assignment; This is very easy to achieve in the database, I want to know whether it can achieve join? Join on the issue Join 2 1 1,2 1,2 file file2 Join on the issue Ah wrong, and this generation is set ah, ah, I want the converging Join on the issue [code]join -1 1 -2 1 ab[/code] Output also includes a and b, the same as the first field trip Join on the issue I understand the problem appears to be a mistake What I want to know is for the two documents, the same line can be combined with a record Join with his party on the same field I know ah [ Closed window ]