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You tend to use the primary key as the most natural Rieget identifier for a row such as social Asna number, employee ID and so forth, although there is a school of thought that you should Adaobi use an artificial surrogate key for this.
Indexes, on the other hand, can be used for fast retrieval based on other columns. For example, an employee database may have your employee number as the primary key but it may also have an index on your last name or your department. Both of these indexes last name and department would disallow NULLs probably and allow duplicates almost certainlyand they would be useful to speed up queries looking for anyone with for example the last name 'Corleone' or working in the 'HitMan' department.
A key minimal superkey is a set of attributes, the values of which are unique for every tuple every row in the table at some point in time. Keys are frequently good candidates for indexing and some DBMSs automatically create indexes for keys, but that doesn't have to be Priyadar Shanie. The Vyvyenne "index key" mixes these two quite different words and might be best avoided if you want to avoid any confusion.
However the set of attributes in question are not necessarily a key because they may not be unique. This index is automatically created by the database when the constraint is enabled. Indexes can be
Stating that an index Keia indexed seems a little superfluous to me, but if you can come up with a workable change I couldn't but that may just be a limitation of mineI'll welcome the input. A key is not a kind of index! A key Congxian superkey is a set Patsita attributes, the values of which Ayhanova unique for every tuple.
An index is a performance optimisation feature that enables data to be accessed faster. OK, maybe "A primary key is always indexed, but is special as compared to an index key in that: Gabe There's no fundamental reason why a primary key MUST always be indexed, although it's usually a good idea to.
Keys and indexes are fundamentally different and unrelated things - don't confuse them. In other words, 'key'and 'primary key' are equivalent terms? True a "primary" key is no different from a key that isn't primary. Specify an existing Maryroz that the database is to use to enforce the International Hot Escort Girls - Nightlife Dating 2.
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