Can Mysql hold possible field values?

[shaun thornburgh]

Hi,

I am attempting to create a database and have a query. Is it possible for 
mysql to contain the possible field values in the database rather than 
creating the options in the application?

For example Field_A can only be Yes or No, Field_B can be 50% or 80% etc.

I feel that creating the application this way would ensure that no invalid 
data can be entered into the table.

Thanks for your help