This post explains on how to get the collection of content types associated to SharePoint List / Library using REST API.
I have lot of items from SharePoint List, but most of the items are duplicated. Here, I am going to give you a tips on getting unique rows from the List. For that, I googled for some time and then
There are two methods available to update the List Items on SPListItem Object. SPListItem.Update(); SPListItem.SystemUpdate(); SPListItem.Update() used to update all the values in SharePoint List Item including pre-defined hidden fields. If we modified the item, that will affects the Modified
If the user want to choose cascade or Restrict option for the lookup field, that user must have the ManageLists permission for the Lookup List. To View the list of Permissions, check the SPBasePermissions enumeration.