How to return a new table without changing the original one when I use tmpTB.replaceColumn!(args)? Is there a parameter like inplace=False in pandas?
How to return a new table after modifying the columns, instead of changing the original table?
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In DolphinDB, all the functions with "!" will change the original object. The only function to replace columns is the
replaceColumn!function. You can assign the original table to a new table variable before modifying it. Or you can use thecopyfunction as follows: