Question
Download Solution PDFConsider a weak entity set in DBMS. Cardinality ratio 'strong entity set : weak entity set' in their binary identifying relationship is:
This question was previously asked in
HTET PGT Official Computer Science Paper - 2019
Answer (Detailed Solution Below)
Option 2 : One to many
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HTET PGT Official Computer Science Paper - 2019
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Detailed Solution
Download Solution PDFRules for Week Entity Set Relationship
- A weak entity set has one or more many-one relationships to other entity sets.
- Not every many-one relationship from a weak entity set needs to be supporting. But supporting relationships must have a rounded arrow.
- The key for a weak entity set is its own underlined attributes and the keys for the supporting entity sets.
- Weak entity-sets depend on at least one strong entity-set
- Relation schema for weak entity-set already includes a primary key for strong entity-set
- If strong entity set exists -> weak entity set exists
- If (strong entity set) not exists -> weak entity set not exists
So, the one-to-many relationship will be there.
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