Set operation — may have one of the following meanings.*Any operation with sets *Set operations (Boolean), in a narrower sense, in the algebra of sets *Set operations (SQL) *Fuzzy set operations * Set operation … Wikipedia
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.New Features* SQL Agent * New… … Wikipedia
Set-builder notation — In set theory and its applications to logic, mathematics, and computer science, set builder notation (sometimes simply set notation ) is a mathematical notation for describing a set by stating the properties that its members must satisfy. Forming … Wikipedia
SQL — This article is about the database language. For the airport with IATA code SQL, see San Carlos Airport. SQL Paradigm(s) Multi paradigm Appeared in 1974 Designed by Donald D. Chamberlin Raymond F. Boyce Developer … Wikipedia
Microsoft SQL Server — Developer(s) Microsoft Stable release SQL Server 2008 R2 (10.50.2500.0 Service Pack 1) / July 11, 2011; 4 months ago … Wikipedia
Null (SQL) — The Greek lowercase omega (ω) character is used to represent Null in database theory. Null is a special marker used in Structured Query Language (SQL) to indicate that a data value does not exist in the database. Introduced by the creator of the… … Wikipedia
Join (SQL) — An SQL join clause combines records from two or more tables in a database.[1] It creates a set that can be saved as a table or used as is. A JOIN is a means for combining fields from two tables by using values common to each. ANSI standard SQL… … Wikipedia
Nested set model — The nested set model is a particular technique for representing nested sets (also known as trees or hierarchies) in relational databases. The term was apparently introduced by Joe Celko; others describe the same technique without naming it [1] or … Wikipedia
Order by (SQL) — An ORDER BY clause in SQL specifies that a SQL SELECT statement returns a result set with the rows being sorted by the values of one or more columns. The sort criteria do not have to be included in the result set. The sort criteria can be… … Wikipedia