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Candidate key and primary key differnece?
All Primary keys are definitely Candidate Keys. A Candidate key is one which can be used as a Primary key that is not null and unique. That is one of the candidate keys can be chosen as a primary key.A Candidate key is a Unique Key and it can be used to find out any particular Tuple (row) in a table. The following are the differences between A Candidate key and a Primary Key: 1) A Unique key can be null but not a Primary key 2) On a table we can have only 1 primary key but 'N' number of unique keys.
How is the primary key used?
It is used as the unique identifier for each record and is used to sort the data
What does the primary key in a data base do?
We know that primary key is the one that is not null and is always unique. A primary key uniquely identifies a record in a table.
What is primary key constraint?
Primary Key is a Constraint Used to avoid Duplicate entries in database table and you define primary key the column doesn't allow NULL values.
What is the difference between candidate key and primary key with example?
Any group of keys or columns (may be one or more than one) which can be used to uniquely refer to any row is together called as candidate key.A primary key only one column name which can be used to uniquely refer any row.there is no much difference b/w these two except the number of columns in consideration.
How do you print an array in php?
There are a few methods however the following is the method that will allow you to do the most with the information afterwards. foreach($array as $key => $value){ echo '[' . $key . '] ' . $value; #$key becomes the array key and value because what the current array item has inside. }
Which key should be used to align the information following the memo heading?
doop
What are some synonyms for then?
Next Later Subsequently Following Afterwards
Is the word afterwards a preposition?
Yes, "afterwards" is an adverb, not a preposition. It is used to indicate a time that is after a particular event or period.
Which of the following was a key internal weakness of the Roman Empire?
What is following.
what field is used as a primary key?
We explicitly choose a primary key.A primary key should satisfy the following conditions: 1) it should not be null 2) it should be unique.
What part of speech is the word afterwards?
"Afterwards" is an adverb. It is used to indicate something that happens after a particular time or event.
Which of the following can be used to create an encapsulated tunnel?
software or hardware products user authentication key and certificate exchange systems
What does a flat following a treble clef mean?
It means the key signature of the following music is in the key of F major of D minor
Is afterwards a connective?
"Afterwards" is not a connective in the traditional sense; it is an adverb used to indicate time. It is not used to link ideas or sentences together in the way connectives like "and," "but," or "however" are.
What are the key ingredients for successful decision making?
the key sucess is following you heart
Candidate key and primary key differnece?
All Primary keys are definitely Candidate Keys. A Candidate key is one which can be used as a Primary key that is not null and unique. That is one of the candidate keys can be chosen as a primary key.A Candidate key is a Unique Key and it can be used to find out any particular Tuple (row) in a table. The following are the differences between A Candidate key and a Primary Key: 1) A Unique key can be null but not a Primary key 2) On a table we can have only 1 primary key but 'N' number of unique keys.
