How do the relations (tables) in SQL differ from the relations defined formally in Chapter 3 Discuss the other differences in terminology Why does SQL allow duplicate tuples in a table or in a query result ER Model Relational Model Entity type Entity relation 1 1 or 1 N relationship type Foreign key(or relationship type) M N relationship type Relationship relation and two foreign keys n ary relationship type Relationship relation and n foreign keys Simple Attributes Attribute Composite attributes Set of simple component attribute Multivalued attributes Relation and foreign keys Value set Domain Key attributes Primary(or secondary) key

Question: How do the relations (tables) in SQL differ from the relations defined formally in Chapter 3? Discuss the other differences in terminology. Why does SQL

How do the relations (tables) in SQL differ from the relations defined formally in Chapter 3? Discuss the other differences in terminology. Why does SQL allow duplicate tuples in a table or in a query result?

ER Model	Relational Model
Entity type	Entity relation
1:1 or 1:N relationship type	Foreign key(or relationship type)
M:N relationship type	Relationship relation and two foreign keys
n-ary relationship type	Relationship relation and n foreign keys
Simple Attributes	Attribute
Composite attributes	Set of simple component attribute
Multivalued attributes	Relation and foreign keys
Value set	Domain
Key attributes	Primary(or secondary) key

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