ORACLE SQL AND PL/SQL INTERVIEW QUESTION : HOW TO CHANGE DATATYPE IN ORACLE SQL?

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This video contains a demonstration on how to change the datatype of a column containing data, the video shows two approaches through which any user can easily change the datatype of a column in a table, the video also helps in solving the Oracle ORA-01440 error.
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write the Plsql bock search the Given name in between firstname, lastname, middle name..
Please help

manjunathreddy