Access жұмыс үстелі дерекқорларына арналған деректер түрлері

Access жұмыс үстелі дерекқорларына арналған деректер түрлері

Маңызды :  This article is machine translated, see the disclaimer. Please find the English version of this article here for your reference.

When creating tables in Access, you need to select a data type for each column of data. The Short Text data type is a popular choice since it lets you enter almost any character (letter, symbol, or number). However, careful selection of data types can help you take advantage of more Access features (such as data validation and functions), and improves the accuracy of the information you’re storing. The table below gives an overview of the data types available in Access desktop databases (.accdb). For information about data types in Access apps, see Data types for Access apps.

Дерек түрі

Пайдалану

Өлшемі

Short Text (formerly known as “Text”)

Alphanumeric data (names, titles, etc.)

Up to 255 characters.

Long Text (formerly known as “Memo”

Large amounts of alphanumeric data: sentences and paragraphs.

Up to about 1 gigabyte (GB), but controls to display a long text are limited to the first 64,000 characters.

Сан

Сандық деректер.

1, 2, 4, 8, or 16 bytes.

Күн/Уақыт

Күндер және уақыттар.

8 bytes.

Валюта

Monetary data, stored with 4 decimal places of precision.

8 bytes.

Автосанағыш

Әрбір жаңа жазба үшін Access жасаған бірегей мән.

4 bytes (16 bytes for ReplicationID).

Иә/жоқ

Boolean (true/false) data; Access stores the numeric value zero (0) for false, and -1 for true.

1 byte.

OLE нысаны

Pictures, graphs, or other ActiveX objects from another Windows-based application.

Up to about 2 GB.

Гиперсілтеме

A link address to a document or file on the Internet, on an intranet, on a local area network (LAN), or on your local computer

Up to 8,192 (each part of a Hyperlink data type can contain up to 2048 characters).

Тіркеме

You can attach files such as pictures, documents, spreadsheets, or charts; each Attachment field can contain an unlimited number of attachments per record, up to the storage limit of the size of a database file.

Up to about 2 GB.

Есептелетін

You can create an expression that uses data from one or more fields. You can designate different result data types from the expression.

Dependent on the data type of the Result Type property. Short Text data type result can have up to 243 characters. Long Text, Number, Yes/No, and Date/Time should match their respective data types.

Lookup Wizard

The Lookup Wizard entry in the Data Type column in Design view is not actually a data type. When you choose this entry, a wizard starts to help you define either a simple or complex lookup field. A simple lookup field uses the contents of another table or a value list to validate the contents of a single value per row. A complex lookup field allows you to store multiple values of the same data type in each row.

Dependent on the data type of the lookup field.

Беттің жоғары бөлігі

Ескерту : Machine Translation Disclaimer: This article has been translated by a computer system without human intervention. Microsoft offers these machine translations to help non-English speaking users enjoy content about Microsoft products, services and technologies. Because the article was machine translated, it may contain errors in vocabulary, syntax or grammar.

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