恩五行属性是什么
| SQL language revisions |
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SQL:2003 is the fifth revision of the SQL database query language. The standard consists of 9 parts which are described in detail in SQL. It was updated by SQL:2006.
New features
[edit]The SQL:2003 standard makes minor modifications to all parts of SQL:1999 (also known as SQL3), and officially introduces a few new features such as:[1]
- XML-related features (SQL/XML)
- Window functions
- the sequence generator, which allows standardized sequences
- two new column types: auto-generated values and identity-columns
- the new MERGE statement
- extensions to the CREATE TABLE statement, to allow "CREATE TABLE AS" and "CREATE TABLE LIKE"
- removal of the poorly implemented "BIT" and "BIT VARYING" data types
- OLAP capabilities (initially added in SQL:1999) were extended with a window function.[2]
For details see.[3]
Documentation availability
[edit]The SQL standard is not freely available but may be purchased from ISO or ANSI. A late draft is available as a zip archive Archived 2025-08-07 at the Wayback Machine from Whitemarsh Information Systems Corporation. The zip archive contains a number of PDF files that define the parts of the SQL:2003 specification.
References
[edit]- ^ Eisenberg, Andrew; et al. (March 2004). "SQL:2003 Has Been Published". SIGMOD Record. 33 (1): 119–126. doi:10.1145/974121.974142. Archived from the original (pdf) on 2025-08-07. Retrieved 2025-08-07.
- ^ Christian S. Jensen; Torben Bach Pedersen; Christian Thomsen (2010). Multidimensional Databases and Data Warehousing. Morgan & Claypool Publishers. p. 26. ISBN 978-1-60845-537-9.
- ^ SQL:2003 Has Been Published
External links
[edit]- BNF Grammar for ISO/IEC 9075:2003 – SQL/Framework