Mind Map generated by NB MindMap plugin   
> __version__=`1.1`,showJumps=`true`
---

# Creat

## Data model
> leftSide=`true`


### \- flat data\-model<br/>\- entity\-relationship model<br/>\-\.\.\.
> align=`left`


## ER model
> leftSide=`true`


### Four elements<br/>\- 1\. entity set <br/>\- 2\. relationship set \(between entities\)<br/>\- 3\. attributes \(domain\)<br/>\- 4\. constraints
> align=`left`


### Database schema \(logical view of DB\)<br/>\- Physical db schema \(storage\)<br/>\- Logical DB schema \(constraint\)
> align=`left`


## information schema\-DB<br/>\- \.tables \(table\_schema\)
> align=`left`,leftSide=`true`

