databasussybaka
Authored by Xuan chinh
Computers
11th Grade
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16 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
what is primary key
an attribute or smallest set of attributes in a table where no tuple has the same value.
a unique identifier for a table. It is a special case of a candidate key.
a candidate key that is an alternative to the primary key.
a set of attributes in one table that refer to the primary key in another table.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
what is a candidate key
a key that is an alternative to the primary key.
an attribute or smallest set of attributes in a table where no tuple has the same value.
a unique identifier for a table. It is a special case of a key.
a set of attributes in one table that refer to the primary key in another table.
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
what is a secondary key
a set of attributes in one table that refer to the primary key in another table.
a candidate key that is an alternative to the primary key.
a unique identifier for a table. It is a special case of a candidate key.
an attribute or smallest set of attributes in a table where no tuple has the same value.
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
what is a foreign key
a unique identifier for a table. It is a special case of a candidate key.
a set of attributes in one table that refer to the primary key in another table.
a candidate key that is an alternative to the primary key.
an attribute or smallest set of attributes in a table where no tuple has the same value.
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
what is a composite key
a set of attributes in one table that refer to the primary key in another table.
a set of attributes that form a primary key to provide a unique identifier for a table.
a candidate key that is an alternative to the primary key.
a unique identifier for a table. It is a special case of a candidate key.
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
what is normalisation
making things normal
the process of organising data to be stored in a database into two or more tables
putting select groups in concentration camps
the process of organising data to be stored in a database into one table
7.
MULTIPLE SELECT QUESTION
45 sec • 1 pt
which one is 2NF
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