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Which of the following are true for relational database?

  1. Number of rows is cardinality, number of columns is degree
  2. Tuple is an entity, column is a relation
  3. Relation is an entity, tuple is a relationship
  4. Row is a tuple, column is an attribute
    1. b & d
    2. a & d
    3. b & c
    4. c & d
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2 Answers

Best answer
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13 votes

Answer : B

A and D are correct

Equivalent Database Concepts

Relation       <===>    Table 
Tuple           <===>    Row or record 
Attribute      <===>    Column or field 
Cardinality   <===>    Number of rows 
Degree        <===>    Number of columns 
Primary key <===>    Unique identifier 
Domain       <===>    Pool of legal values

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