How to determine the size of a VARCHAR2?

I want to determine the size of a column VARCHAR2 with PL/SQL.

So, if I have:
    foo some_table.some_column%TYPE;
where some_column is a VARCHAR2, how can I programatically tell how many characters will be insert in foo? I do not want to hard-code, because someone might come along and change the width of column on me later, and then my code would break. I search for a function in the SQL documentation, but fails.

USER_TAB_COLUMNS

Tags: Database

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