How to extract a column numerical data as strings?

2020 4 7
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I have some data stored in xlsx format. There is always a column data called "Station IDs". Sometimes it is numerical and sometimes it is strings. I'm using readtable to read the xlsx file.
T=readtable('test.xlsx');
My program can automaticall identifically the column numer (n). I can get the whole column of data as:
A = T.(n);
Here is my question. How do I get the column values as strings no matter it is originally numerical or strings.
Thanks.

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