DataPush to a database

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I would like to inquire how to make the DataPush update records in a table in a database.
I noticed (or I must have missed out something) that if I have a table with x number of records then I DataPush to the table (with updates to current records in the table) with y number of records.
The result is that the table would have the y number of records even if y < x.
It seems to be doing a DROP TABLE then a CREATE TABLE.
TIA

Edited question