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it need to ... : 1) hold different types of data in a collection
2) record their relationships
3) have range of sizes capacity
we can : 1) insert ,delete , amend data
2) retrieve ( get ) data in different ways
3) manage the collections from loss and corruption
types of data can be stored : jpg , mp3 ,mp4, date ,number
types of data: NoSQL database
personal database
cloud database
object-oriented database (OOD 不是OOP)
relational database
Database management systems
- keep data up to date
- find and retrieve data
- protect data
- store effectively
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