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There are two types of the subset:
Row Subset - in this case user will define/limit rows for the migration as the SQL’s “WHERE“ condition.
Workflow → Tables → Fill the “Subsetting“ field:
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Column Subset - user will be able to check/
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un-check the specific columns for migration. If some column was not checked then the data will not be read from the source database.
Workflow → Tables → Click on the icon in the “Columns“ field:
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As result the selected table will appear in the destination database without un-checked columns.