Microsoft Office Tutorials and References
In Depth Information
Number
Access Data Types
Single
Positive or negative numbers with up
to 38 zeroes and 7 decimal places
of accuracy. Requires four bytes of
space.
The best choice if you need to store
non-integer numbers or numbers
that are too large to fit in a Long
Integer.
Double
Positive or negative numbers with up
to 308 zeroes and 15 decimal places
of accuracy. Requires eight bytes of
space.
Useful if you need ridiculously big
numbers.
Decimal
Positive or negative numbers with up
to 28 zeroes and 28 decimal places
of accuracy. Requires eight bytes of
space.
Useful for numbers that have lots
of digits to the right of the decimal
point.
Note: Table 26-2 doesn’t include Replication ID, because you use that option only with the Number data
type (page 723).
Number formatting
The Field Size determines how Access stores your number in the table. However,
you can still choose how it’s presented in the datasheet. For example, 50, 50.00, 5E1,
$50.00, and 5000% are all the same number behind the scenes, but people interpret
them in dramatically different ways.
To choose a format, you set the Format field property. Your basic built-in choices
include:
General Number. Displays unadorned numbers, like 43.4534. Any extra zeroes
at the end of a number are chopped off (so 4.10 becomes 4.1).
Currency and Euro. Both options display numbers with two decimal places,
thousands separators (the comma in $1,000.00), and a currency symbol. These
choices are used only with the Currency data type (page 726).
Fixed. Displays numbers with the same number of decimal places, filling in
zeroes if necessary (like 432.11 and 39.00). A long column of numbers lines up
on the decimal point, which makes your tables easier to read.
Standard. Similar to Fixed, except it also uses thousands separators to help you
quickly interpret large numbers like 1,000,000.00.
Percent. Displays numbers as percentages. For example, if you enter 0.5, that
translates to 50%.
Scientific. Displays numbers using scientific notation, which is ideal when you
need to handle numbers that range widely in size (like 0.0003 and 300).
Scientific notation displays the first nonzero digit of a number, followed by a fixed
number of digits, and then indicates what power of ten that number needs to be
multiplied by to generate the specified number. For example, 0.0003 becomes
3.00 × 10 -4 , which displays as 3.00E–4. The number 300, on the other hand,
becomes 3.00 × 10 2 , or 3.00E2.
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