Join (SQL)
An SQL join clause combines records from two or more tables in a database. 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 specifies four types of JOIN: INNER, OUTER, LEFT, and RIGHT. As a special case, a table (base table, view, or joined table) can JOIN to itself in a self-join.
A programmer writes a JOIN predicate to identify the records for joining. If the evaluated predicate is true, the combined record is then produced in the expected format, a record set or a temporary table.
Read more about Join (SQL): Sample Tables, Inner Join, Outer Joins, Merge Rows, Alternatives, Implementation
Famous quotes containing the word join:
“The truth is that every intelligent man, as you well know, dreams of being a gangster and ruling over society through violence alone. Since this is not as easy as the novels would have us believe, people generally resort to politics and join the cruelest party.”
—Albert Camus (1913–1960)