DBMS · Relational Model interview questions

1. A.the candidate key chosen to uniquely identify rows, which cannot be null
2. B.a minimal super key with no redundant attribute that still identifies tuples uniquely
3. C.a table of rows and columns representing a set of related data in the relational model
4. D.the number of tuples (rows) in a relation

Answer + AI explanation with a free account

1. A.Composite key
2. B.Foreign key
3. C.Referential integrity
4. D.Relation

Answer + AI explanation with a free account

1. A.Relation — the set of permitted atomic values that an attribute may take
2. B.Relation — the rule that a primary key attribute may never contain a null value
3. C.Relation — the rule that a foreign key must match an existing primary key value or be null
4. D.Relation — a table of rows and columns representing a set of related data in the relational model

Answer + AI explanation with a free account

1. A.the number of tuples (rows) in a relation
2. B.any set of attributes that uniquely identifies each tuple in a relation
3. C.a single row of a relation representing one record
4. D.the set of permitted atomic values that an attribute may take

Answer + AI explanation with a free account

1. A.Tuple
2. B.Cardinality
3. C.Super key
4. D.Alternate key

Answer + AI explanation with a free account

1. A.Tuple — the number of tuples (rows) in a relation
2. B.Tuple — the rule that a primary key attribute may never contain a null value
3. C.Tuple — a single row of a relation representing one record
4. D.Tuple — a key made of two or more attributes that together uniquely identify a tuple

Answer + AI explanation with a free account

1. A.any set of attributes that uniquely identifies each tuple in a relation
2. B.a minimal super key with no redundant attribute that still identifies tuples uniquely
3. C.the candidate key chosen to uniquely identify rows, which cannot be null
4. D.a named column of a relation describing one property of its entities

Answer + AI explanation with a free account

1. A.Attribute
2. B.Foreign key
3. C.Tuple
4. D.Domain

Answer + AI explanation with a free account

1. A.Attribute — the set of permitted atomic values that an attribute may take
2. B.Attribute — a minimal super key with no redundant attribute that still identifies tuples uniquely
3. C.Attribute — the number of tuples (rows) in a relation
4. D.Attribute — a named column of a relation describing one property of its entities

Answer + AI explanation with a free account

1. A.the rule that a primary key attribute may never contain a null value
2. B.the set of permitted atomic values that an attribute may take
3. C.a key made of two or more attributes that together uniquely identify a tuple
4. D.the candidate key chosen to uniquely identify rows, which cannot be null

Answer + AI explanation with a free account

1. A.Alternate key
2. B.Attribute
3. C.Domain
4. D.Cardinality

Answer + AI explanation with a free account

1. A.Domain — any set of attributes that uniquely identifies each tuple in a relation
2. B.Domain — a key made of two or more attributes that together uniquely identify a tuple
3. C.Domain — the rule that a foreign key must match an existing primary key value or be null
4. D.Domain — the set of permitted atomic values that an attribute may take

Answer + AI explanation with a free account

1. A.a table of rows and columns representing a set of related data in the relational model
2. B.the number of attributes (columns) in a relation
3. C.the set of permitted atomic values that an attribute may take
4. D.any set of attributes that uniquely identifies each tuple in a relation

Answer + AI explanation with a free account

1. A.Entity integrity
2. B.Attribute
3. C.Tuple
4. D.Degree

Answer + AI explanation with a free account

1. A.Degree — a minimal super key with no redundant attribute that still identifies tuples uniquely
2. B.Degree — the number of attributes (columns) in a relation
3. C.Degree — a candidate key not chosen as the primary key
4. D.Degree — a named column of a relation describing one property of its entities

Answer + AI explanation with a free account

1. A.a candidate key not chosen as the primary key
2. B.the number of tuples (rows) in a relation
3. C.the rule that a foreign key must match an existing primary key value or be null
4. D.any set of attributes that uniquely identifies each tuple in a relation

Answer + AI explanation with a free account

1. A.Cardinality
2. B.Alternate key
3. C.Referential integrity
4. D.Entity integrity

Answer + AI explanation with a free account

1. A.Cardinality — the set of permitted atomic values that an attribute may take
2. B.Cardinality — the number of tuples (rows) in a relation
3. C.Cardinality — a minimal super key with no redundant attribute that still identifies tuples uniquely
4. D.Cardinality — the rule that a foreign key must match an existing primary key value or be null

Answer + AI explanation with a free account

1. A.a minimal super key with no redundant attribute that still identifies tuples uniquely
2. B.the rule that a primary key attribute may never contain a null value
3. C.any set of attributes that uniquely identifies each tuple in a relation
4. D.a key made of two or more attributes that together uniquely identify a tuple

Answer + AI explanation with a free account

1. A.Alternate key
2. B.Referential integrity
3. C.Composite key
4. D.Super key

Answer + AI explanation with a free account

1. A.Super key — the candidate key chosen to uniquely identify rows, which cannot be null
2. B.Super key — the rule that a primary key attribute may never contain a null value
3. C.Super key — the number of tuples (rows) in a relation
4. D.Super key — any set of attributes that uniquely identifies each tuple in a relation

Answer + AI explanation with a free account

1. A.the number of attributes (columns) in a relation
2. B.a minimal super key with no redundant attribute that still identifies tuples uniquely
3. C.the rule that a primary key attribute may never contain a null value
4. D.a single row of a relation representing one record

Answer + AI explanation with a free account

1. A.Composite key
2. B.Candidate key
3. C.Alternate key
4. D.Attribute

Answer + AI explanation with a free account

1. A.Candidate key — the set of permitted atomic values that an attribute may take
2. B.Candidate key — the number of tuples (rows) in a relation
3. C.Candidate key — a candidate key not chosen as the primary key
4. D.Candidate key — a minimal super key with no redundant attribute that still identifies tuples uniquely

Answer + AI explanation with a free account

1. A.the candidate key chosen to uniquely identify rows, which cannot be null
2. B.the rule that a primary key attribute may never contain a null value
3. C.the number of tuples (rows) in a relation
4. D.a key made of two or more attributes that together uniquely identify a tuple

Answer + AI explanation with a free account

1. A.Entity integrity
2. B.Primary key
3. C.Attribute
4. D.Super key

Answer + AI explanation with a free account

1. A.Primary key — a minimal super key with no redundant attribute that still identifies tuples uniquely
2. B.Primary key — the candidate key chosen to uniquely identify rows, which cannot be null
3. C.Primary key — the set of permitted atomic values that an attribute may take
4. D.Primary key — the number of tuples (rows) in a relation

Answer + AI explanation with a free account

1. A.an attribute referencing the primary key of another relation to enforce a link between tables
2. B.the number of attributes (columns) in a relation
3. C.a table of rows and columns representing a set of related data in the relational model
4. D.a named column of a relation describing one property of its entities

Answer + AI explanation with a free account

1. A.Degree
2. B.Super key
3. C.Foreign key
4. D.Composite key

Answer + AI explanation with a free account

1. A.Foreign key — the rule that a primary key attribute may never contain a null value
2. B.Foreign key — the candidate key chosen to uniquely identify rows, which cannot be null
3. C.Foreign key — a minimal super key with no redundant attribute that still identifies tuples uniquely
4. D.Foreign key — an attribute referencing the primary key of another relation to enforce a link between tables

Answer + AI explanation with a free account