Varchar2 and Nchar lengths..

Hi All,
I have a doubt. In the Oracle book.. it is said that, maximum size of Varchar2 and Nchar datatypes is 32767bytes. but in the bottom, maximum width in the database comumns are 4000 and 2000 bytes respectively, and we cannnot insert more than that..
Can anybody explain what is the difference..?
Thanks in advance

You are mixing and matching things ...
Oracle SQL is not the same as Oracle PL/SQL
Oracle SQL character datatypes are limited to 4K bytes.
Oracle PL/SQL character datatypes are limited tp 32K bytes.
Please go back to the books and verify the context as SQL or PL/SQL

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