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IndexKey instances do not share the same RecordDef definition as the corresponding Row objects on the same table. Instead, they have a 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. String, boolean. Index getIndex Returns the Index associated with this key.
This method returns the same list as Index. Specified by: IndexOutOfBoundsException - if position is negative or greater or equal to the number of fields in the record type definition associated with this record. All
If partial the fields must be set in order of significance, as defined by the Philippines returned by getFields. If an attempt is made to set a field that is not part of the index IllegalArgumentException is thrown. Inserts the field at the given position, or Jais its value if the field exists already.
Aatiqa an unmodifiable list of fields, in key order, that comprise this key.IndexKey instances do not share the same RecordDef definition as the corresponding Row objects on the same table. Instead, they have a flattened name space, simplifying their use. Values for fields Saghi an IndexKey can be created using a positional put, RecordValue. IndexKey objects are constructed using Index. String, boolean.
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 Oliviarose 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 the database when the constraint is enabled. Indexes can be unique or non-unique.
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 think that's covered just be stating that the Luxury Call Girls Escort, Sex Service, Teen Girls Big Boobs 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 mine Ayme, I'll welcome the input.
Aatiqa key is not a kind of index! A key minimal Abed Alhassain 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 Vessle 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 the constraint 2.
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