change of char(10), vchar (10)...

Hey people, I use oracle 10g, I have a big, big, big database. At the time, the database has been defined as char (10). This means that if the variable is size 10 the rest will be completed with the empty space. So, I have a solution to this database of million tables. I just have to get the tank type varchar our make a plate for every request that is made. These are my two solutions.
But I don't know what are the benefits of one and the other. And I don't know how to make tables that are already implemented as char. Because the time of treatment, it will be enourmos and if I just move from char to varchar, it will not give a big mistake?

Thank you.

everytme if someone filed an application if they do not all have the carachter 10, it won't work.

No, you must use a variable of type char (10) and to use in your query.

something like that

select * from tableA where cars = :a

Here: one is a variable binding. So when you use this query in a PL/SQL or any other client to define the variable as char (10) and store the value. You will have no problem.

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