資料庫問題看不懂....

因為英文看不太懂...翻譯網又翻得亂七八糟的...希望懂的前輩可以幫我解釋一下

1.SDLC and prototyping are two approaches to database and information system development.

2.Describe the main features of SDLC and prototyping.

3.List the steps in SDLC.

4.Describe and draw the three-schema architecture.

5.Describe three-tiered database architecture.

6.Explain the differences among an entity instance and an entity type.

7.Explain the differences among a relationship instance and a relationship type.

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  • 1 decade ago
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    參考看看,有誤請指正!

    1.SDLC and prototyping are two approaches to database and information system development.

    系統開發生命週期法(SDLC, System Develope Life Cycle)及雛型法是資料庫及資訊系統開發的2種方式。

    2.Describe the main features of SDLC and prototyping.

    描述系統開發生命週期法及雛型法的主要特性。

    3.List the steps in SDLC.

    列出系統開發生命週期法之步驟。

    4.Describe and draw the three-schema architecture.

    描述並畫出(資料庫)三綱要架構。

    5.Describe three-tiered database architecture.

    描述三層式資料庫架構。

    6.Explain the differences among an entity instance and an entity type.

    解釋實體實例(entity instance)及實體型態(entity type)之差異。

    註:實體型態,如教練、球員、觀眾。實體實例,如教練A、教練B、教練C、球員1、球員2、球員3、球員4、球員5、球員6、球員7、觀眾1...觀眾1000。實體型態為實體實例類別之集合。

    7.Explain the differences among a relationship instance and a relationship type.

    解釋關連實例(relationship instance)及關連型態(relationship type)之差異。

    註:關連型態,如教練指導球員、球員參加球隊。關連實例如、球員1參加球隊A、球員2參加球隊A、球員3參加球隊B。關連型態為關連實例之集合。

    Source(s): me
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