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Why do you need a parameter in view? You might just use WHERE clause.
create view v_emp as select * from emp ;
and your query should do the job:
select * from v_emp where emp_id=&eno;
no. if you must then use a user defined function to which you can pass parameters into.
No, a view is queried no differently to SELECTing from a table.
To do what you want, use a table-valued user-defined function with one or more parameters