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Update queries modify information within a record at one or more fields at a time.

Append queries copy complete records at a time, adding to the existing set of records in a table.

For example, if an "Address" field needs to be changed for the records in a table, you can use an update query to make that change. If you have two tables with various "Customer Information" listings, you can use an append query to copy the records of one table to the other.

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