What is Roll up summary field in Salesforce?

Roll up summary field in salesforce calculates the Count, Sum, Min or Max of particular field of any child record. Thus, we can say that Roll up summary field can only be created on Master object.

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Differences between the Import Wizard and the Apex Data Loader

Salesforce CRM provides two tools for data migration—the Import Wizard and the Apex Data Loader. The Import Wizard   is designed for les...