A database is a system for storing and taking care of data (any kind of information).
A database engine can sort, change or serve the information on the database. The information itself can be stored in many different ways; before digital computers, card files, printed books and other methods were used. Now most data is kept on computer files.
A database system is a computer program for managing electronic databases. A very simple example of a database system would be an electronic address book.
The data in a database is organized in some way. Before there were computers, employee data was often kept in filing cabinets. There was usually one card for each employee. On the card, information such as the date of birth or the name of the employee could be found. A database also has such "cards". To the user, the card will look the same as it did in old times, only this time it will be on the screen. To the computer, the information on the card can be stored in different ways. Each of these ways is known as a database model. The most commonly used database model is called the "relational database model". It uses relations and sets to store the data. Normal users talking about the database model will not talk about relations; instead, they will talk about database tables.
Uses for database systems include:
In databases, some data changes occasionally. There may be problems when data is changed; for example, an error might have occurred. The error might make the data useless. The database system looks at the data to ensure that it meets certain requirements. It does this by using a transaction. There are two points in time in the database, the time before the data was changed, and the time after the data was changed. If something goes wrong when changing the data, the database system simply puts the database back into the state before the change happened. This is called a "rollback". After all the changes are done successfully, they are "committed". This means that the data makes sense again; committed changes can no longer be undone.
In order to be able to do this, databases follow the ACID principle:
There are different ways how to represent the data.
As in real life, the same data can be looked at from different perspectives, and it can be organized in different ways. There are different things to consider, when organizing the data:
Lichtenfels
Lichtenfels is a German town in Franconia. Its population is about 21,000. It lies at the Main River and between Coburg and Bamberg.
It is also called the German Basket City.
Its mayor is Dr. Bianca Fischer.
There is the A 73 Nürnberg-Coburg-Erfurt, the B173 Bamberg-Dresden and the B 289 Coburg-Rehau
Neustadt bei Coburg
Neustadt bei Coburg is a German city in the North of Franconia and has an population of ca. 17,000. It is near Coburg. Its mayor is Frank Rebhan (SPD).
Next important traffic routes are in Coburg.
Kronach
Kronach is a German town in northern Upper Franconia. Its population is about 18,000. It is in the Frankenwald near Coburg. Its mayor is Wolfgang Beiergrößlein.
Next important Traffic routes are in Coburg and Lichtenfels.
Rödental
Rödental is a German town in the north of Franconia. There are about 14,000 people living in Rödental. Rödental and Coburg have grown together like one city. The mayor of Rödental is Gerhard Preß.
Rocko's Modern Life
Rocko's Modern Life is an animated television show that aired on Nickelodeon from 1993 to 1996. It was also debuted in the same year on the STAR Chinese Channel in Greater China. A comic book series also named "Rocko's Modern Life" was made.
Its characters included an Australian wallaby named Rocko, his dog Spunky, his best friend Heffer, a turtle named Filbert who was a big fan of Fishsticks, and his not-so-friendly neighbors Mr. and Mrs. Bighead. The show's story line was based on Rocko's everyday life, which was anything but normal.
Rocko was voiced by Carlos Alazraqui.
Jörð
Jörð (or Jord) is a giantess (jötun) and goddess in Norse mythology. Her name means "earth". She is also called Fjörgyn.
Jörð is the wife of Odin, king of the gods, and the mother of Thor. Her parents are Annar and Nótt.
Snorri Sturluson says Jörð was included among the Asynjur. Her name occurs most often in Skaldic and Eddic poetry in phrases that refer to Thor as "the son of Jörð". There is some confusion, however, because in some parts of the Poetic Edda the word "Fjörgyn" appears in phrases referring to Thor, such as in the poem "Voluspa", where Thor is described as "the son of Fjörgyn". Scholars explain the confusion by pointing out that Fjörgyn, as an Old Norse noun, means "earth" when used in the feminine form.
Asgard
Asgard (Old Norse: "Ásgarðr" - “Enclosure of the Æsir; Court of the Ás”) is one of the Nine Realms in Norse mythology, home to the tribe of deities known as the Æsir. Asgard lies at the top of Yggdrasill’s highest branches, and the only thing connecting Asgard to Midgard is the mystical rainbow bridge Bifröst.
At the center of Asgard lies the bountiful field of Iðavöllr; there the Æsir meet to feast, make revelry, and discuss important issues. The male gods meet in a hall called Glaðsheimr, the goddesses in the hall Vingólf. *According to the poem "Grímnismál" (as found in the Poetic Edda), Glaðsheimr is the field in which Valhalla was located.
In the science fiction series Stargate SG-1 and its spinoff series, "Stargate Atlantis", "Asgard" is the name of a highly advanced, fictional race of beings who are extraterrestrial in origin.
Asgard appears frequently in Marvel Comics. Similar to the original mythological location, it is one of the Nine Realms, home to a race of beings known as the Asgardians, whom the Germanic peoples (in particular Norsemen) once worshipped as gods. It is often seen and referenced in both film, and television shows.
Midgard
Midgard is an old Germanic name for our world. Midgard means "middle enclosure". It is where the term "Middle Earth" comes from. The term is an English version of the Old Norse language.
Midgard is a realm in Norse mythology. It is the home of mortals. Midgard is surrounded by a world of water or ocean. The ocean is inhabited by the great sea serpent Jörmungandr. It is a world between Asgard, the land of the gods (Aesir) and Helheim (Hel), the land of the dead. Midgard was connected to Asgard by the Bifrost Bridge, which is guarded by the god Heimdall.
According to mythology, Midgard will be destroyed in Ragnarök, the battle at the end of the world. Jörmungandr will arise from the ocean. He will poison the land and sea. The final battle will take place on the plain of Vigrond. Midgard and almost all life on it will be destroyed, with the earth sinking into the sea.
Alien (movie)
Alien is a 1979 British-American science fiction–horror movie directed by Ridley Scott. It is called a science fiction movie because the story takes place in outer space, and there are alien creatures. The movie's title refers to a highly aggressive (angry) and intelligent extraterrestrial (alien creature) that attacks and hurts the crew of the spaceship "Nostromo". The movie stars Sigourney Weaver as Ellen Ripley, Tom Skerritt as Captain Dallas, and Ian Holm as Ash.
The extraterrestrials in the movies are usually called Xenomorphs.
"Alien" was a box office success (it made a lot of money). It led to a successful Hollywood franchise of books, video games, merchandise, and three official sequels (follow-ups). Along with launching the career of actress Sigourney Weaver, the movie is credited as being the first action movie to have a strong female heroine.
There are three sequels to this movie: "Aliens" (1986), "Alien³" (1992), "" (1997), and a cross-overs: "Alien vs. Predator" (2004) and "Aliens vs. Predator: Requiem" (2007).
The famous tagline (slogan) for the movie was: "In space no one can hear you scream."
Isabella of Castile