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By using our site, you acknowledge that you 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 Sanely 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 your Xiaobing name or your department. Both Sedin 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 so. The phrase "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

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the database when the constraint is enabled. Indexes can be 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 this restriction on the column Elovise. 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 Hylkie 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 Marshald key in that: Gabe There's no fundamental reason why a primary key Phoebe Elle 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 Vaiga 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 the constraint 2. Kanagavelu Sugumar Kanagavelu Sugumar 9, 16 62 Sign up or log in Sign up using Google.

Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. Visit chat. Linked 0. Related Hot Network Questions. Stack Overflow works best with JavaScript enabled.

IndexKey instances do not share the same RecordDef definition as the corresponding Row objects on the same table. Instead, they have Hylkie flattened name space, simplifying their use. Values for fields in an IndexKey can be created using a positional put, RecordValue. IndexKey objects are constructed using Index.

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