SQL-92

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This article is about SQL-92, the third revision of the SQL standard. For more information about SQL, see the main SQL article.

SQL-92 was the third revision of the SQL database query language. Unlike SQL-89, it was a major revision of the standard. For all but a few minor incompatibilities, the SQL-89 standard is forwards-compatible with SQL-92.

[edit] New Features

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, date and time mathematics, and conditional statements.
New set operations such as UNION JOIN, NATURAL JOIN, set differences, and set intersections.
Support for alterations of schema definitions via ALTER and DROP.
Bindings for C, Ada, and MUMPS.
New features for user privileges.
New integrity-checking functionality such as within a CHECK constraint.
New schema definitions for "Information".
Dynamic execution of queries (as opposed to prepared).
Better support for remote database access.
Temporary tables.
Transaction consistency levels.
New operations for changing data types on the fly via CAST.
Scrolling cursors.
Compatibility flagging for backwards and forwards compatibility with other SQL standards.