The currency type is a special kind of decimal, with up to 4 digits on the right of the decimal point and up to 15 on the left. Type for integers larger than the range supported by the Long Integer type.ĭecimals are only supported by Microsoft Access 2000 and later.Ī decimal number uses 17 bytes of disk space. Despite the name "Decimal" you can also use the decimal data The maximum total number of digits supported by Access is 28.ĭecimals are used for exact numeric values. Decimals have a fixed number of digits to left and They can have a fractional part,Īnd they can be either positive or negative. The single byte number is named Byte (Range 0-255), the two-byte number is named Integer (-32768 to 32767)Īnd then there is the Long Integer (-2 billion to 2 billion).ĭecimal numbers are so called fixed point numbers. Integers in Access come in 1, 2 and 4 byte varieties. Numeric Types Byte, Integer and Long Integer MDB Viewer automatically supports all encodings used in Access. Therefore Microsoft switched to the Unicode character encoding in Access 2000.
This worked great in most cases,īut caused problems when columns contained text in different alphabets.
#MS ACCESS DATA TYPE CODE#
Microsoft Access supports text in a variety of languages and alphabets.Īccess 97 supported multiple code pages in the same document. The Text data type is used for short text fields of limited length, and can contain up to 255 characters.Ī Memo field is a virtually unlimited text field. This document will describe each data type and note which versions of Microsoft Access support it. key field - the field which is the primary keyīefore creating a database, you need to think about its purpose.Fields in a Microsoft Access database can be of many different data types.Īccess supports different kinds of text, numbers, dates and some more special data types.validation - the rules for accepting data.field size - the maximum or minimum size of entry.data type - the data types are used in each field.There are key areas to consider about the data:
When you design a database you need to create a schema to explain what type of data is being stored. The structure of the database is also called the schema or dictionary. Number value with a maximum number of digits of 'size' total, with a maximum number of 'd' digits to the right of the decimal. Number value with a maximum number of column digits specified in brackets. In the database programming language SQL, the data types can be set as follows: Data typeįixed-length character string. character strings (ordered sequences of characters), for example: abc, def456, Boolean values, for example: 'True' or 'False'.characters, for example: a, F, 3, $, £, #.floating point numbers (with decimal points, sometimes called real numbers, or floats), for example: 4.2, 27.4, 56.8.integers (whole numbers), for example: 4, 27, 65535.The most commonly-supported data types are: Different kinds of data values also need different amounts of memory to store them, and have different operations that can be performed upon them. Fields are usually restricted to a certain data type.ĭata typing is a way of classifying data values that have common properties. For example, in a film database you might need alphabetical characters for 'Titles', but numbers for 'Duration'. When you create a database you need to set data types for each field. These units of data are also called data elements. The actual units of data that are entered into a database give the attributes for each entity.