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The char data type accepts strings that are of fixed length.....
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BLOB, CLOB, NCLOB are stored internally where as BFILE is stored externally....
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Each table in oracle has a pseudocolumn called ROWID. Oracle uses ROWID to store address of each rows of the table......
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The LOB datatypes includes BLOB, CLOB, NCLOB and BFILE that can store large blocks of unstructured data such as graphic images......
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