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{{Unreferenced|date=October 2006}}
{{Orphan|date=February 2009}}
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The '''SERM''' (Structured Entity Relationship Model) is an amplification of the [[Entity-relationship model|ERM]] which is commonly used for [[data modeling]]. It was first proposed from Prof. Dr. Sinz in 1989. The SERM is commonly used in the [[SAP AG|SAP]]-world for the [[data modeling]]. ▼
▲The '''SERM''' (Structured Entity Relationship Model) is an amplification of the [[Entity-relationship model|ERM]] which is commonly used for [[data modeling]]. It was first proposed from Prof. Dr. Sinz in 1989. The SERM is commonly used in the [[SAP AG|SAP]]-world for the [[data modeling]].
==Aims==
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==SERM-Symbols==
[[Image:SERM-Symbols.JPG|600px
==SERM-Example==
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* Every invoice is referred to one [[customer]], as well. Invoices without [[customer]]s are illegal. [[Customer]]s without any invoice are legal.
* To every invoice there is belonging at least one invoice line item.
* Every invoice line item is related to exactly order item. An order item could be calculated or not.
* SERM is already in the [[third normal form]]
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