Cita:
After activating the TQuery, inspect the CanModify property to determine whether the request for a live result set was successful.
Note: All multi-table queries return read-only result sets. Other conditions may cause a query to return a read-only result set. For local tables (such as dBASE and Paradox), see the local SQL help file for rules governing live result sets (updatable queries). For other table types (such as InterBase, Oracle, and Sybase), consult the documentation for the specific database system.
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Me temo que tendrás que utilizar el componente
TUpdateSql, para lo que deseas.
Un Saludo.