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# System prepended metadata

title: 資料庫

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# 資料庫

RDB:(Relational data base)三元件：
1. data structure:
    a. attribute(field) 
    b. relation(table)
    c.  data format
2. limit: data integrity constraint
3. data manipulation:ex sql(DML)


[開源SQL比較](https://kknews.cc/zh-tw/news/x8xpy8q.html)
[主流nosql比較](https://www.itread01.com/content/1549451538.html)
[主流sql比較](https://www.twblogs.net/a/5c0a9fcfbd9eee6fb21374a2)

