Microsoft Office Tutorials and References
In Depth Information
Going beyond Basic Arithmetic
If a placeholder represents an optional argument, and you don’t plan to use
that argument, you can just delete the placeholder. If the placeholder
represents a required argument, though, you need to replace the placeholder with
valid data.
Using the help feature often when working with functions is very important.
We doubt that anybody has ever managed to memorize all the functions
because of the sheer number of them, all supporting so many different
arguments.
Nesting functions
You can nest functions, meaning that you can put a function inside another
function. Because Access always works from the innermost parentheses
outward, the inside function is always calculated first. The Date()
function, for example, always returns the current date. It requires no arguments.
The WeekDay() function accepts any date as an argument, meaning that its
syntax looks like the following:
WeekDay( date )
Because the Date() function always returns a date, you can use it as the
argument to the WeekDay() function. The expression turns out to be
WeekDay(Date())
Access returns a number from 1 to 7, indicating which day of the week
today is. (Day 1 is Sunday, Day 2 is Monday, and so on.) If the current date
is the 23rd, for example, and that day is a Tuesday, the WeekDay() function
returns 3.
Going beyond Basic Arithmetic
Near the start of this chapter, we talk about how you can use the +, –, *,
and / operators in expressions to perform simple arithmetic. As you know,
not all math is quite that simple. Some calculations require more than just
addition, subtraction, multiplication, and division.
Access offers many mathematical and financial functions to help with
morecomplex math. All these functions operate on numbers. The math functions
include Cos() (cosine), Tan() (tangent), and Atn() (arctangent), in case
you need to do a little trigonometry in your queries. The financial functions
include things such as IRR() (internal rate of return), Fv() (future value),
and Ddb() (double-declining balance depreciation). You’re unlikely to need
financial functions unless your work specifically requires those sorts of
calculations.
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