Join a column in a attribute table " definitively"

[المشرف العام]

Hi everyone!

I have this problem;

I have a layer (vector) i have add a column in the attribute table using "table joins"

i have used this fuction after that i had import a .csv table.

My problem it's that when i deleted the imported table the columns that i have join disappears too!



how can I keep the column and deleted the import table? http://postimg.org/image/n3an15tdj/





(to join the column i have used this method http://www.qgistutorials.com/en/docs/performing_table_joins.html)



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