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A VARCHAR or variable character field is a set of character data of indeterminate length. The term varchar refers to a data type of a field (or column ) in a database which can hold letters and numbers.
The length of a string can also be stored explicitly, for example by prefixing the string with the length as a byte value. This convention is used in many Pascal dialects; as a consequence, some people call such a string a Pascal string or P-string. Storing the string length as byte limits the maximum string length to 255.
A value of an ADT consists of a constructor tag together with zero or more field values, with the number and type of the field values fixed by the constructor. The set of all possible values of an ADT is the set-theoretic disjoint union (sum), of the sets of all possible values of its variants (product of fields).
HTML and XML provide ways to reference Unicode characters when the characters themselves either cannot or should not be used. A numeric character reference refers to a character by its Universal Character Set/Unicode code point, and a character entity reference refers to a character by a predefined name. A numeric character reference uses the ...
It was designed for backward compatibility with ASCII: the first 128 characters of Unicode, which correspond one-to-one with ASCII, are encoded using a single byte with the same binary value as ASCII, so that a UTF-8-encoded file using only those characters is identical to an ASCII file.
In computer programming, a type or data type is a defined kind of data, that is, a set of possible values and basic operations on those values. This category contains articles and subcategories about data types generally and about specific, commonly-used data types.
New data types defined: DATE, TIME, TIMESTAMP, INTERVAL, BIT string, VARCHAR strings, and NATIONAL CHARACTER strings. Support for additional character sets beyond the base requirement for representing SQL statements. New scalar operations such as string concatenation and substring extraction, date and time mathematics, and conditional statements.
BLOB, CHAR, CHAR(x) CHARACTER SET UNICODE_FSS, VARCHAR(x) CHARACTER SET UNICODE_FSS, VARCHAR: BLOB SUB_TYPE TEXT, BLOB: DATE, TIME, TIMESTAMP (without time zone) BOOLEAN: TIMESTAMP, CHAR (38), User defined types (Domains) Type system Integer Floating point Decimal String Binary Date/Time Boolean Other HSQLDB [158] Static