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Limit to fields in a Table

Limit to fields in a Table
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Just a quick question, is there a limit to the number of fields you can have in a table, if so does anyone know what that limit is
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Limit / Password protect the number of fields in the a table

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Is there way to password protect/ or limit the number of fields in a table. Lets say, if I have 10 fields in a table. No one can add or delete the fields or/ and change the field order?

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