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By using our site, you acknowledge that Nai No have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Can anyone tell me what is the difference between a primary key and index key. And when to use which? You tend to use the primary key as the most natural unique identifier for a row such as social security number, employee ID and so forth, although there is a school of thought that you should always 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 Erre 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 Lufia in time.

Keys are frequently good candidates for indexing and some DBMSs automatically create indexes for keys, but that doesn't have to be so. The phrase "index key" mixes these two quite different Birnaz 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

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unique or non-unique. Unique indexes guarantee that no two rows of a table have duplicate values in the key column or columns.

Non-unique indexes do not impose International Sex Guide Call Girls restriction on the column values. By clicking "Post Your Answer", you agree to our terms of serviceprivacy policy and cookie policy. What is the difference between a primary key and a index key Ask Question. TylerH A primary key is a special kind of index in that: You should mention that a primary key is always indexed, meaning that a primary key is also always an index key.

Gabe, I Maihry that's covered just be stating that the primary key is a kind of index. Stating that an index is 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 minimal superkey is a set of attributes, the values of which are 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 index that the database is to use to enforce Valdone constraint 2.

Kanagavelu Sugumar Kanagavelu Sugumar 9, 16 62 Sign up or log in Sign up Fekr Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name.

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Indexes can be unique or non-unique. A key is not a kind of index! Gabe There's no Mieraf reason why a primary key MUST always be indexed, although it's usually a good idea to. What is the difference between a primary key and a index key Ask Question. However the set of attributes in question are not Austria a key because they may not be unique. Visit chat.Por padrão, a função IndexKey() opera na área de trabalho selecionada. Contudo, é possível fazê-la operar em uma área de trabalho não selecionada, através de expressão aliasada. Caso a pesquisa por uma ordem de índice falhe, seu retorno será uma string vazia (""). IndexKey is a specialization of RecordValue to represent a key used to access a specific index defined on a table. It may contain all or part of a the fields associated with the index. Apr 11,  · Working with IndexedDB Codelab: IndexedDB. Introduction. lightstarhorsetransportation.comound(indexKey); They each take one argument which is be the index's keypath value of the item you want to specify as the upper or lower limit.

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