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Each column in an SQL table declares the type(s) that column may contain. ANSI SQL includes the following data types. [14] Character strings and national character strings. CHARACTER(n) (or CHAR(n)): fixed-width n-character string, padded with spaces as needed; CHARACTER VARYING(n) (or VARCHAR(n)): variable-width string with a maximum size of n ...
AustLII was established in 1995. [1] [2] Founded as a joint program of the University of Technology Sydney and the University of New South Wales law schools, its initial funding was provided by the Australian Research Council. [3] Its public policy purpose is to improve access to justice through access to legal information. [4]
via AustLII: South Australian Law Reports: SALR: 1863-1920: via AustLII: Neutral citation: SASC: 1989-AustLII. BarNet JADE. SASCFC: 2010-AustLII. BarNet JADE. Court of Criminal Appeal and Full Court of the Supreme Court Supreme Court (Tas) Tasmanian Reports: Tas R: 1978-Thomson Reuters: Authorised report. 1978-1991: AustLII: Tasmanian State ...
List of relational database management systems, for database management systems based on the relational model. Comparison of object database management systems, showing what fundamental object database features are implemented natively; Document-oriented database, for storing, retrieving and managing document-oriented information
For referential integrity to hold in a relational database, any column in a base table that is declared a foreign key can only contain either null values or values from a parent table's primary key or a candidate key. [2] In other words, when a foreign key value is used it must reference a valid, existing primary key in the parent table.
In relational databases, the information schema (information_schema) is an ANSI-standard set of read-only views that provide information about all of the tables, views, columns, and procedures in a database. [1] It can be used as a source of the information that some databases make available through non-standard commands, such as:
SQL was initially developed at IBM by Donald D. Chamberlin and Raymond F. Boyce after learning about the relational model from Edgar F. Codd [12] in the early 1970s. [13] This version, initially called SEQUEL (Structured English Query Language), was designed to manipulate and retrieve data stored in IBM's original quasirelational database management system, System R, which a group at IBM San ...
SQL-92 was the third revision of the SQL database query language. Unlike SQL-89, it was a major revision of the standard. Aside from a few minor incompatibilities, the SQL-89 standard is forward-compatible with SQL-92. The standard specification itself grew about five times compared to SQL-89.