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Keywords:
Column,
Row,
Unique,
Identify,
Constraint
An entry in a database index. Each key in the index corresponds to a table row and is composed of specific column values from that row.
A display-only field(s) that uniquely identifies your data. To display a page, a user enters the key(s) so that EIS can retrieve the correct row of data.
The unique, first move in the solution to a Chess problem.
An individual button on a keyboard; by extension, the character(s) or command(s) it signals. In searching, a synonym for search string. In indexing or database management, the most important field, in the sense that it uniquely identifies an item. In corpus-based linguistics, a benchmark against which the accuracy of an annotation procedure can be compared.
an attribute or set of attributes of a class that uniquely identify a particular instance of the class. L M
A column or columns whose values identify a row. See also foreign key and primary key.
(n.) unique object of a search.
(1) An identifier within a set of data elements. (2) In SQL, a column or an ordered collection of columns identified in the description of an index. IBM. See .
Column or set of columns included in the definition of certain types of integrity constraints. Keys describe the relationships between the different tables and columns of a relational database. See Also: integrity constraint, foreign key, primary key
the unique identifier of a record, usually involving one primary key and one or more secondary keys.
A column or set of columns in one table that uniquely identifies each row in the table. Each row in a table has a value in the primary key different from that of every other row in that table. The primary key cannot be null.
the columns (in a relational environment) or fields (in a record-oriented environment) that together uniquely identify a row or record.
a value used to identify an entry in a table.
A column or set of columns in a table that identifies a unique row of data.
an elements or combination of elements that uniquely identifies a row in a table within a relational database. (See also Relational database.)
A column or an ordered collection of columns that are identified in the description of a table, index, or referential constraint.
while the characteristic of a set is it cannot have duplicated elements, sets themselves do not suggest in theory how to avoid duplicated. For relational theory, it's important to be able to identify a record univocally and to give it a distinctive signal. Also, because a set doesn't have an inherent order but ordering is a way to help discarding duplicates, improve performance and group tuples, there are different types of keys: unique, primary, alternate, surrogate, identity, non-unique and foreign are the most known names.
identify as in botany or biology, for example
One or more columns whose values uniquely identify a row.
A key (or primary key) is a field that uses a number or character sequence unique to each record in a table (e.g., social security number) for identification purposes.
One of the attributes of an entity on which an index has been created or a relation has been set. Primary keys are the key attributes in a table, secondary keys are used to sort records with the same primary attribute value, foreign keys are the attributes in a table which provide the facility for relationships to be set with primary keys in the parent table.
An Item or column within an RDBMS that contains a unique value for each record in the database.
A group of fields that, taken collectively, uniquely identifies a record in a file or subfile. All fields in a key must have values. The term "simple key" refers to keys that are composed of only one field; the term "compound key" refers to keys that are composed of more than one field. Keys are stored in the KEY file (#.31).
The column or set of columns whose values are used to identify any row in a table. While not the same as an index, unique indexes are typically created on key columns. See also primary key, unique key, and foreign key.
A string of characters used in encryption to give unique results.
a chart showing grouping characteristics used to identify different classifications of birds The bird key helped us decide the bird at our feeder was a song sparrow.
A data element (attribute or column) or the combination of several used to identify a member of a set, instance of an entity, or record in a table.
A value used to identify a record in a database, often simply on the fields. The set of keys for all records is the index.
Columns in an that identify a row.
A field that identifies a record. Tables are indexed and sorted on key fields. Within a sort, the fields that determine sort order.
A way of accessing something. Any set of columns used for retrieval of rows from a table.
The main identifying field in a data record to which associated information is attached, such as a student number for college records.
a group of characters (usually a field or set of fields) that uniquely identify a record.
A column or columns in a table that uniquely identify a row; often used to index a table.
An attribute used to sort and/or identify data in some manner.
Many objects used in a2ps, such as encodings, have both a key and a name. The word name is used for a symbol, a label, which is only meant to be nice to read by a human. For instance `ISO Latin 1' is a name. a2ps never uses a name, but the key. A key is the identifier of a unique object. This is information that a2ps processes, hence, whenever you need to specify an object to a2ps, use the key, not its name. For instance `latin1' is the unique identifier of the `ISO Latin 1' encoding.
A unique identifier. A key is a column or combination of columns whose value is unique for each row.
A unique id for data vector or profile vector.
(1.) One or more characters used to identify a record and establish the record's order within an indexed file. (2.) A unique identifier (of type key_t) that names the particular interprocess communications member. (3.) Identifies the name of the shared library text image. (4.) An identifier within a set of data elements. (5.) A character string that matches a definition in a key table.
In a database a key is a field used to sort or speed up access to data. In a relational database records are normally identified by a unique combination of keys or fields.
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