Types of dbExpress Datasets
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TSQLDataSet is the most general of the four. You can use an SQL dataset to represent any data available through dbExpress, or to send commands to a database accessed through dbExpress. This is the recommended component to use for working with database tables in new database applications.
TSQLQuery is a query-type dataset that encapsulates an SQL statement and enables applications to access the resulting records, if any.
TSQLTable is a table-type dataset that represents all of the rows and columns of a single database table.
TSQLStoredProc is a stored procedure-type dataset that executes a stored procedure defined on a database server.