What is a composite key in a database?
ڈیٹا بیس میں جامع کلید کیا ہے؟
- Set of one or more attribute that can be used to uniquely identify the records in a table
- The minimal set of attribute that uniquely identifies each occurrence of an entity type
- The candidate key that is selected to uniquely identify each occurrence of an entity type
- A candidate key that consists of two or more attributes
Explanation
In database design, a composite key is a candidate key that consists of two or more attributes (table columns) that together uniquely identify an entity occurrence (table row).
A compound key is a composite key for which each attribute that makes up the key is a simple (foreign) key in its own right.
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ایچ ڈی ایم آئی کیبل کا کیا کام ہے؟
- To connect audio and video devices
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- To connect storage devices
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
بٹ کوائن کس ٹیکنالوجی کو استعمال کرتا ہے؟
- Hashgraph
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- DAG
- None of these
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فشنگ عام طور پر کس مقصد کے لیے کی جاتی ہے؟
- Install legitimate updates
- Improve computer performance
- Obtain sensitive information through deceptive messages or websites
- None of these
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مضبوط پاس ورڈ کا بنیادی مقصد کیا ہے؟
- Protect an account from unauthorized access
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- Increase internet speed
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
براؤزر میں بک مارک کا بنیادی مقصد کیا ہے؟
- Remove viruses
- Delete browsing history
- Save a webpage for easier future access
- None of these
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