Join (SQL)

A SQL join clause combines records from two or more tables in a relational database. It creates a set that can be saved as a table or used as it is. A JOIN is a means for combining fields from two tables (or more) by using values common to each. ANSI-standard SQL specifies five types of JOIN: INNER, LEFT OUTER, RIGHT OUTER, FULL OUTER and CROSS. 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 statement to identify 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.

Sample tables

Relational databases are usually normalized to eliminate duplication of information such as when objects have one-to-many relationships. For example, a Department may be associated with a number of Employees. Joining separate tables for Department and Employee effectively creates another table which combines the information from both tables. This is at some expense in terms of the time it takes to compute the join. While it is also possible to simply maintain a denormalized table if speed is important, duplicate information may take extra space, and add the expense and complexity of maintaining data integrity if data which is duplicated later changes.

Join (topology)

In topology, a field of mathematics, the join of two topological spaces A and B, often denoted by , is defined to be the quotient space

where I is the interval [0, 1] and R is the equivalence relation generated by

At the endpoints, this collapses to and to .

Intuitively, is formed by taking the disjoint union of the two spaces and attaching a line segment joining every point in A to every point in B.

Properties

is homeomorphic to the reduced suspension

of the smash product. Consequently, since is contractible, there is a homotopy equivalence

Examples

List of DOS commands

This article presents a list of commands used by DOS operating systems, especially as used on x86-based IBM PC compatibles (PCs). Other DOS operating systems are not part of the scope of this list.

In DOS, many standard system commands were provided for common tasks such as listing files on a disk or moving files. Some commands were built into the command interpreter, others existed as external commands on disk. Over the several generations of DOS, commands were added for the additional functions of the operating system. In the current Microsoft Windows operating system, a text-mode command prompt window, cmd.exe, can still be used.

Command processing

The command interpreter for DOS runs when no application programs are running. When an application exits, if the transient portion of the command interpreter in memory was overwritten, DOS will reload it from disk. Some commands are internal — built into COMMAND.COM; others are external commands stored on disk. When the user types a line of text at the operating system command prompt, COMMAND.COM will parse the line and attempt to match a command name to a built-in command or to the name of an executable program file or batch file on disk. If no match is found, an error message is printed, and the command prompt is refreshed.

Man (Middle-earth)

In J. R. R. Tolkien's Middle-earth books, such as The Hobbit and The Lord of the Rings, the terms Man and Men refer to humankind – in contrast to Elves, Dwarves, Orcs and other humanoid races – and does not denote gender.

The Elves call the race of Men Atani in Quenya, literally meaning "Second People" (the Elves being the First), but also Hildor (Followers), Apanónar (After-born), and Fírimar or Firyar (Mortals). Less charitably they were called Engwar (The Sickly), owing to their susceptibility to disease and old age, and their generally unlovely appearance in the Elves' eyes. The name Atani becomes Edain in Sindarin, but this term is later applied only to those tribes of Men who are friendly to the Elves. Other names appear in Sindarin as Aphadrim, Eboennin, and Firebrim or Firiath.

Origins

The race of Men is the second race of beings created by the One God, Ilúvatar. Because they awoke at the start of the Years of the Sun, while the Elves awoke at the start of the First Age during the Years of the Trees, they are called the Afterborn by the Elves.

Man (disambiguation)

A man is an adult male Human. Man may also mean the entire human species, its individuals and nearest extinct relatives. See man (word) for the etymology.

Man or MAN may also refer to:

Places

Music

Acronyms

Manú (footballer)

Emanuel Jesus Bonfim Evaristo (born 28 August 1982), known as Manú, is a Portuguese professional footballer who plays mainly as a right winger.

Club career

Born in Setúbal, Manú started his professional career in the 2001–02 season playing for F.C. Alverca, before signing for S.L. Benfica in 2004 on a four-year contract. He was immediately loaned after arriving, serving stints in Italian sides Modena F.C. and A.C. Carpenedolo to gain experience, and returned to Portugal in the 2005–06 campaign for another temporary spell with C.F. Estrela da Amadora, where he played in 31 league games and scored seven goals, contributing to the preservation of the side's first division status.

In June 2006 Manú was given a new four-year deal and made his official debut for the Eagles by playing in both legs of the UEFA Champions League third qualifying round win against FK Austria Wien, also making a substitute appearance for Benfica in the group stages against F.C. Copenhagen, on 13 September 2006 (0–0 away draw).

Newcastle (electoral district)

Newcastle was a provincial electoral district in the Canadian province of British Columbia to the south and including some of the city of Nanaimo. It appeared in the 1916 and 1920 elections only. In 1924, portions of it were incorporated into the new Cowichan-Newcastle riding. For other ridings in the Nanaimo area, please see Nanaimo (electoral districts).

Demographics

Electoral history

Note: Winners of each election are in bold.