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In any database there should always be a way of uniquely identifying each record. That is the main purpose of a primary key. In the real world we have things like reference numbers, membership numbers, registration numbers, serial numbers and so on. Using these we can uniquely identify something as no other object will have the same number. So if two people who have the same name work in a company, they would have different employee numbers and so they can be identified. Without something to uniquely identify data, there is confusion and it can cause major problems in a database.
Wiki User
∙ 11y ago
Wiki User
∙ 12y agoit serve as uniqueness of the table to the other table. meaning, it serves as the identity of the table towards to the other table.
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What is Supper key in MS Access?
primary key
Which field MS Access will not allow you to delete?
A primary key field.A primary key field.A primary key field.A primary key field.A primary key field.A primary key field.A primary key field.A primary key field.A primary key field.A primary key field.A primary key field.
What is the meaning of primary key in Microsoft access?
The primary key is the designation given to the field or fields that make a record unique in a table. Often times in Access an autonumber field is used as the primary key because Access will always generate a unique number for each record. Having a primary key is not a requirement but it is highly recommended that you have a primary key in each table.
What is a unique identifier in Access?
Primary key
Does a primary key have to be an integer in an Access database?
No, it does not. A primary key can be different types of data, not just an integer.
What is another term for major key in access 2007?
Primary Sort key
In Microsoft Access what does the key symbol mean?
It indicates the field or fields that are the primary key.
What are properties of a primary key?
The properties of primary key are as follows: 1. It should be unique. 2. It should be not null.
Have all tables primary key?
No, all tables do not have primary key. Primary must be explicitly defined and must not be null.
Does Access automatically creates and maintains an index for a table's primary key?
Access automatically creates an index for the primary key field in a table. In addition, Access automatically creates an index for any field name that contains the following letter sequences: code, ID, key, or num.
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.
How will you remove primary key?
removing the primary key is very simple, all you need to do is click on that specif field and at the top of the page there will be a key sign. once the field is highlightes then just click the key tab and it should be then removed
