0
What is the difference between candidate key and primary key with example?
Wiki User
∙ 11y ago
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.
Wiki User
∙ 11y ago
Add your answer:
Earn +20 pts
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.
What is the difference between primary colors and additive colors?
#1 primary colors make additive colors
What is the difference between a key and a superkey in DBMS?
I am supposing that key means primary key.Superkey is any subset of attributes that uniquely identifies the tuples of a relation. This subset need not be minimal, that is, one can remove some attributes from it and it is still uniquely identifying. If all redundant attributes are removed you get a subset what is called primary key.
What is special about primary colors?
Primary colours cannot be made up of other colours. For example, red and yellow (primary colours) make orange which is a secondary colour. But no amount of other colours can make a primary colour (red, yellow and blue)x
What are the differences between primary key foreign key and candidate key?
A primary key is a column which uniquely identifies the records in a table. In a broad sense, a primary key is the mixture of a unique key and an index: A column with a primary key is indexed to deliver a faster query, and doesn't allow duplicate values to ensure specific data. Most programmers recommend all tables having a primary key (and only one) to enhance the speed of queries and overall database performance. An example of a primary key may be found in a table named "departments," which might have a column named "department_number" that uniquely identifies each department in the table with a number.A foreign key is a column (the child column ) in a table which has a corresponding relationship and a dependency on another column (the parent column ) that is usually in a different table. Parent columns can have multiple child columns, but a child column can only have one parent column. The child column is the column with the foreign key; the parent column does not have the foreign key "set" on it, but most databases require the parent column to be indexed. Foreign keys are made to link data across multiple tables. A child column cannot have a record that its parent column does not have. Say a table named "employees" has 20 employees (rows) in it. There are 4 departments in the "departments" table. All 20 employees must belong to a department, so a column in the "employees" table named "department" would point to the primary key in the "departments" table using a foreign key. Now all employees must belong to a department as specified by the "departments" table. If a department isn't specified in the "departments" table, the employee cannot be assigned to it.A candidate key would be any key which could be used as the primary key, which means that the combination of the columns, or just the single column would create a unique key. You would then need to determine which of these candidate keys would work best as your primary key.
What is difference between primary candidate and candidate key?
don't ask me I'm trying to find out to but i think it has something to do with the government
What is the difference between primary key and candidate key?
Candidate Key is used to uniquely identify the records of a table. An attribute becomes a Primary Key, if all the other candidate keys lose race for being qualified as Primary Key.
Explain the difference between primary and secondary market research data give an example of each and explain how each helps define a business customer?
difference between primary and secondary market
What is difference between closed and open primary?
In an open primary anyone can vote for any candidate in either party regardless of whether they are registered democrat or republican. In a closed primary you can only vote for someone in your registered party.
Explain the difference between primary data and secondary data give an example of each?
Primary data is data collected firsthand, through surveys, interviews, experiments, etc. by the researcher, while secondary data is existing data that has already been collected by someone else. An example of primary data would be survey responses collected by a marketing team for a new product. An example of secondary data would be industry reports or census data obtained from a government website.
What is the difference between grit chamber and primary settling tank?
Are you sure that's difference and not just a half-witted example of sameness?
What is the difference between modal and primary auxiliary?
difference between primary auxiliary verbs and modal verbs
What is the difference between primary and secondary vitamin deficiency?
what is the difference between primary and seconday vitamin deficiency
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.
What is the difference between primary key and secondary key in database?
A primary key is a unique identifier for each record in a database table and is used to ensure data integrity and enforce entity integrity. A secondary key, also known as a candidate key, is an alternate unique key that can be used to identify records, but is not designated as the primary key.
Identify the difference between primary sector and secondary?
Identify the difference between primary sector and secondary sector
What is the difference between primary elections and general elections?
Political parties use primary elections to determine who they will nominate to represent the parties in the general elections. In the general elections, voters choose from among candidates of various political parties their preferences to fill government offices.
