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Murali KrishnaMurali Krishna 

What is the difference between Validation rule and roll-up summary fields

What is the difference between Validation rule and roll-up summary fields

Best Answer chosen by Admin (Salesforce Developers) 
Bhawani SharmaBhawani Sharma
It you want to validate your data before inserting/updating in database, then validation rules comes in picture. like if you want made a field mandatory based on other field value, you can write a validation rule.

Rollup Sumaary: This is to rollup child data on Parent. Like how many children, parent is having. Max value from child etc..Roll up field only works in M_D relationship.

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Avidev9Avidev9
Have a look at these links.

Validation RULE : http://ap1.salesforce.com/help/doc/en/fields_defining_field_validation_rules.htm

Roll Up : http://ap1.salesforce.com/help/doc/en/fields_about_roll_up_summary_fields.htm
Bhawani SharmaBhawani Sharma
It you want to validate your data before inserting/updating in database, then validation rules comes in picture. like if you want made a field mandatory based on other field value, you can write a validation rule.

Rollup Sumaary: This is to rollup child data on Parent. Like how many children, parent is having. Max value from child etc..Roll up field only works in M_D relationship.
This was selected as the best answer