If you have installed vTiger with the sample data and then want to delete that data, you can use the following SQL query:
update vtiger_crmentity set deleted = 1
The easiest way to execute the query is through the phpMyAdmin tool. Go to your cPanel and click on phpMyAdmin in the Databases box.
Once in phpMyAdmin, select the vTiger's database from the drop-down menu at left. The page will refresh and the database's tables will be displayed on it. Open the SQL tab (look at the top navigation bar).
In the text field write the above SQL query and click on the GO button to submit the query.
This SQL query will set a deleted flag for all existing module records in vTiger. You can revert back any record by setting deleted = 0.
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