CS403_Lecture08

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  • เผยแพร่เมื่อ 10 พ.ย. 2024

ความคิดเห็น • 4

  • @gullam_mustafa
    @gullam_mustafa 2 ปีที่แล้ว +3

    Why key(attributes or set of attributes to identify attribute instance uniquely) plays significant role in the DB?👍🏻✔
    02:00 accessing the data (maybe you want to select single record out of millions of records in DM) for processing
    >> National Way to identify a record: Check the value of a specific attribute of record.
    >> Note: Value of Key's attribute should not be same with value of other key's attribute.
    >> Note: Most of the times we don't create an Entity Type, it exists there, we have to identify key's attribute👍🏻
    _____________
    11:10 key serves two purposes: (Presents the information stored in it i.e, metre no), (Identify a record from others)

  • @khawarhussain126
    @khawarhussain126 2 ปีที่แล้ว +2

    Excellent Sir 👌

  • @Ulma_Heritage5687
    @Ulma_Heritage5687 2 ปีที่แล้ว +1

    Good