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When querying for data, the database can perform calculations on the data before returning it. You saw such an example earlier in the chapter when COUNT(*) was used to count the number of family members for each lastname. There are a whole range of mathematical functions available in SQL. Some of the most common include SUM, MIN, and MAX, which are used to summarize the values of a column or to get the minimum or maximum value. These functions provide you with a powerful tool. When used in SELECT statements, it is possible to combine these functions with GROUP BY clauses to calculate results based on groups of rows. The results from these calculations can be combined using normal arithmetic operations such as +, -, *, and /. The following statement uses the SUM function, division, and COUNT(*) to calculate the average annual salary for each family: SELECT names.lastname, SUM(salaries.annual)/COUNT(*) AS 'Average', MIN(salaries.annual) AS 'Minimum', MAX(salaries.annual) AS 'Maximum' FROM names LEFT JOIN salaries ON names.id = salaries.id GROUP BY names.lastname Because you do a left join, the family members that do not have an income will be included in the COUNT(*), but not in the functions summarizing and picking out the minimum and maximum values. This means that the minimum salary for those named Doe stays at 900,

You can use loops using for to enumerate collections, performing an imperative action, one that returns unit, on each element. This is similar to the foreach loop available in many programming languages. The syntax for using a comprehension to enumerate a collection is the for keyword followed by the identifier that will be bound to each item in the collection, then the collection, and then the keyword do. The code for processing each item in the collection comes next indented to show it belongs to the for loop. The following example demonstrates this, enumerating an array of strings and printing each one: #light let words = [| "Red"; "Lorry"; "Yellow"; "Lorry" |] for word in words do print_endline word The results are as follows: Red Lorry Yellow Lorry As you ll see later in this chapter, and in many examples throughout the book, this can be a convenient way to work with collections returned by .NET BCL methods.

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It turns out to be an astronaut on the space station, and he was basically asking, in a nice way, when s he coming home Years later, ironically, the BlackBerry allowed me to enjoy part of that childhood aspiration, because the BlackBerries were used by NASA, and they were using them to communicate with the International Space Station..

DVR That had never been done before Nobody had ever thought of it before It was a brand new idea I remember complaining to the team once that we were like 6 months from release of the product and we hadn t recorded anything yet I said, Don t you think it would be a good idea to test that out And everyone would go, No That s easy That s not the hard bit The hard bit is pausing and all this kind of stuff And I m going, I know, but if you try and record something, the chances are that it s not going to work and you are going to learn a lot So finally I persuaded them to record something, and, sure enough, it all fell apart and we had to scramble at the end to make all that work.

but the average salary is calculated at 800. The complete results from the statement can be seen in the following table:

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