The Union All component is used to combine more than one inputs to a single output.
Use of UnionAll Component :The Union All component is used to combine more than one input to a single output.Step 1: Create a DataFlowTask Component. Edit the dataflowtask and add an OLEDB Data source. Connect the OLEDB datasource with the database. Step 2: Drag and drop a Conditional Split component from the toolbox and connect the input. Step 3: Edit the conditional split component. Add the following condition as mentioned below. Step 4: Drag and drop the RowCount component and connect it mentioned below. Assign the variables also to store the RowCount value from the RowCount component. Step 5: Now the empty records and non-empty records are separated , to join this one , we can use union all to merge this two branches. Step 6: Place one more row count component after the Union all component, to get the total row count. Step 7: Execute the package.
Basics of SQL Server