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While there is typically only one conceptual (or logical) and physical (or internal) view of the data, there can be any number of different external views. This allows users to see database information in a more business-related way rather than from a technical, processing viewpoint. For example, a financial department of a company needs the payment details of all employees as part of the company's expenses, but does not need details about employees that are the interest of the human resources department. Thus different departments need different views of the company's database.
How many duplicated external views of data are there?
A: unanswerable

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The financial crisis was not widely predicted by mainstream economists except Raghuram Rajan, who instead spoke of the Great Moderation. A number of heterodox economists predicted the crisis, with varying arguments. Dirk Bezemer in his research credits (with supporting argument and estimates of timing) 12 economists with predicting the crisis: Dean Baker (US), Wynne Godley (UK), Fred Harrison (UK), Michael Hudson (US), Eric Janszen (US), Steve Keen (Australia), Jakob Brøchner Madsen & Jens Kjaer Sørensen (Denmark), Kurt Richebächer (US), Nouriel Roubini (US), Peter Schiff (US), and Robert Shiller (US). Examples of other experts who gave indications of a financial crisis have also been given. Not surprisingly, the Austrian economic school regarded the crisis as a vindication and classic example of a predictable credit-fueled bubble that could not forestall the disregarded but inevitable effect of an artificial, manufactured laxity in monetary supply, a perspective that even former Fed Chair Alan Greenspan in Congressional testimony confessed himself forced to return to.
Who credit 12 heterodox economists with predicting the crisis in his research credits?
A: Dirk Bezemer

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The Virgin birth of Jesus was an almost universally held belief among Christians from the 2nd until the 19th century. It is included in the two most widely used Christian creeds, which state that Jesus "was incarnate of the Holy Spirit and the Virgin Mary" (the Nicene Creed in what is now its familiar form) and the Apostles' Creed. The Gospel of Matthew describes Mary as a virgin who fulfilled the prophecy of Isaiah 7:14, mistranslating the Hebrew word alma ("young woman") in Isaiah 7:14 as "virgin", though.[citation needed] The authors of the Gospels of Matthew and Luke consider Jesus' conception not the result of intercourse and assert that Mary had "no relations with man" before Jesus' birth.[Mt 1:18] [Mt 1:25] [Lk 1:34] This alludes to the belief that Mary conceived Jesus through the action of God the Holy Spirit, and not through intercourse with Joseph or anyone else.
What century was the Apostles' Creed written in?
A: unanswerable

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Prior to 1948, approximately 800,000 Jews were living in lands which now make up the Arab world (excluding Israel). Of these, just under two-thirds lived in the French-controlled Maghreb region, 15–20% in the Kingdom of Iraq, approximately 10% in the Kingdom of Egypt and approximately 7% in the Kingdom of Yemen. A further 200,000 lived in Pahlavi Iran and the Republic of Turkey. Today, around 26,000 Jews live in Arab countries and around 30,000 in Iran and Turkey. A small-scale exodus had begun in many countries in the early decades of the 20th century, although the only substantial aliyah came from Yemen and Syria. The exodus from Arab and Muslim countries took place primarily from 1948. The first large-scale exoduses took place in the late 1940s and early 1950s, primarily in Iraq, Yemen and Libya, with up to 90% of these communities leaving within a few years. The peak of the exodus from Egypt occurred in 1956. The exodus in the Maghreb countries peaked in the 1960s. Lebanon was the only Arab country to see a temporary increase in its Jewish population during this period, due to an influx of refugees from other Arab countries, although by the mid-1970s the Jewish community of Lebanon had also dwindled. In the aftermath of the exodus wave from Arab states, an additional migration of Iranian Jews peaked in the 1980s when around 80% of Iranian Jews left the country.[citation needed]
When did the migration of Iranian Jews hit its lowest point?
A:
unanswerable