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Assuming your on Acess (which isn't the best, its just the easiest for new users) then go on your table in design view the icon under the new Db icon, once the table is opened.

Then add your new field by going and writing in the last and blank line.

Example in SQL:

ALTER TABLE Employee ADD height INTEGER NOT NULL DEFAULT 0;

adds a field called "height", of type integer, to table Employee. "NOT NULL" means a value is required; "DEFAULT 0" means 0 will be stored if no value is given when adding/modifying a record.

This command can be different for other SQL dialects.

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Q: How do you insert a new field into an existing database?
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