Error messages begin with the # (hashtag) symbol.
Answer:
A primary key is a special relational database table column (or combination of columns) designated to uniquely identify each table record. A primary key is used as a unique identifier to quickly parse data within the table. A table cannot have more than one primary key.
Primary Key.
Candidate Key.
Alternate Key.
Super Key.
Composite Key.
Foreign Key.
Unique Key.
In the relational model of databases, a primary key is a specific choice of a minimal set of attributes that uniquely specify a tuple in a relation. Informally, a primary key is "which attributes identify a record," and in simple cases constitute a single attribute: a unique ID.
Explanation:
Answer:
class Phone(object):
def __init__(self, model, partNumber, retailPrice):
self.model = model
self.part_number = partNumber
self.retail_price = retailPrice
def phone_specs(self):
print( "Phone model: {}\nPart number: {}\nRetail price: {}".format( self.model, self.part_number, self.retail_price))
phone1 = Phone("Nokia", "asd234", 200.0)
phone1.phone_specs()
Explanation:
A class is a blueprint of a data structure used to create objects of the same data types and methods. The Phone class is an object that creates an instance of the phone1 object. The phone_specs method is used to display the details of the phone1 object.
Answer:
Explanation:
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