Reviewing It

1:Explain the difference between the HTP package and the HTF package.
2:What is htp.p used for?
3:Why would you want to call another PL/SQL procedure in a Web environment?
4:In Listing 9.9, line 4, why is the p_inv_id variable set to null?
5:In Listing 9.10, what error message will be displayed if the car requested cannot be found?
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