The data types in Oracle are Numeric, Varchar, Varchar2, Date, LOB, CLOB and BLOB

Char(20)- This means it takes 20 bytes of storage. Max limit is 20.

Varchar(20)- If you give ‘abcd’ only 4 bytes storage it takes. Max limit is 2000 bytes.

Varchar2- Max limit is 4000 bytes

Char, Varchar and in Varchar2 String is case sensitive.

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