
Custom objects are database tables that allow you to store data specific to your organization in salesforce.com.
You can use custom objects to extend salesforce.com functionality or to build new application functionality.
Master Detail relationship is the Parent child relationship. In which Master represents Parent and detail represents Child. If Parent is deleted then Child also gets deleted. Rollup summary fields can only be created on Master records which will calculate the SUM, AVG, MIN of the Child records.
•Up to 2 allowed to object.
•Parent field on child is required.
•Access to parent determines access to children.
•Deleting parent automatically deletes child.
•A child of one master detail relationship cannot be the parent of another.
•Lookup field on page layout is required.
No, directly we cannot create master details relationship if custom object contains existing records.
Steps to follow:
Lookup relationships are used when you want to create a link between two objects, but without the dependency on the parent object.
So you can have all 40 as Lookup Relationship fields,38 Lookup and 2 MD or 39 Lookup and 1 MD relationship fields on an object
| Lookup | Master detail |
| Loosely coupled. | Strongly coupled. |
| Roll-up summary field cannot be created. | Roll-up summary field can be created. |
| Parent record is not required while creating a child record. | Parent record is always required in order to create a child record. |
| Lookup fields are not required on the page layout of the detail record. | Master-detail field is always required on the page layout of the detail record. |
| Standard object record can be on the detail side of a custom object in a lookup relationship. | Standard object record cannot be a child. |
| By default record ownership of child records is not controlled by the parent. | Parent controls the record ownership of child records. The owner field is not available on the detail record in master-detail relationship queues, sharing rules and manual sharing is not possible for detail records as it requires the owner field. |
| You can have a child record without a parent. | You cannot have a child record without a parent. |
| You can have a maximum of 40 lookups on an object. | You can have a maximum of two master details on an object. |
| No cascade delete. | cascade delete. |
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