Deleting table definitions, field definitions, and data
Deleting a table or field in the Manage Database dialog box permanently and irretrievably deletes the table or field definition and all the data in that table or field.
Important  Before you delete a field or a table, confirm that you don’t need any of the data it contains.
To delete a table definition:
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With the database open, choose File menu > Manage > Database.
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In the Tables tab, select one or more tables that you want to delete, then click Delete.
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Click Also remove occurrences of these tables in the graph to remove any tables based on this data table from the relationships graph.
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Click Delete to continue the deletion.
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Click Cancel to leave the table unchanged.
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Click Done.
To delete a field definition:
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With the database open, choose File menu > Manage > Database.
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In the Fields tab, select one or more fields that you want to delete, then click Delete.
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Click Delete to continue the deletion.
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Click Cancel to leave the field unchanged.
6.
Click Done.
To delete a field definition in Table View:
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Choose Field > Delete Field from the shortcut menu.
Notes
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Related topics 
About relationships
Working with the relationships graph
Changing relationships