Q.1 What are the advantages and disadvantages compared to the standard SQL and SQL*plus ?
Q.2 when i type 'ed' or 'edit' in oracle i did n't presented by any editor what is the problem?
Q.3 what is the difference between 11.5.7 and 11.5.10 versions of oracle applications

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Standard SQL:

SQL is a very simple and powerful database access language. It is a nonprocedural language and the user describe in SQL what he wants to do and the SQL language compiler automatically generates a procedure to navigate the database and perform the desired and reqired task.

IBM Research developed and defined SQL and ANSI/ISO has defined SQL as the standard language for relational database management systems. The SQL implemented by Oracle Corporation for Oracle is fully compliant with the ANSI/ISO 1992 standard SQL data language.

Oracle SQL includes many versions to the ANSI/ISO standard SQL language and Oracle tools and applications provide additional commands. The Oracle tool SQL*Plus allow you to execute ANSI/ISO standard SQL statement against an Oracle database as well as additional commands or functions .

So using SQL*Plus is more advantageous than Standard SQL becuase we have got more facilities while using Standard SQL is core language.