What is Datatable

Data table assists you in parameterizing the test.
There are two type of Data tables are available in QTP.
1. Design time data table 2. Runtime Data table.

Design time Data table -

There are two type of data sheets available, they are 1. Global Data Sheet 2.Local Data Sheet
The Global Data Sheet contains the data that replaces parameters in each iteration of test.
Each time you add a new action to the test, a new action sheet (Local Sheet) added to the data table. It contained data, replaces parameter in only one iteration of the test.

Run time Data table -

During a run session, Quick test creates a runtime data table.
When the run session ends, the runtime data table closes, and the data table pane again displays the stored design time data table.
The final data from the runtime data table is displayed in the runtime data table in the test results window.