Data types for access web apps

Important    Access Services 2010 and Access Services 2013 are being removed from the next release of SharePoint. We recommend you do not create new web apps, and migrate your existing apps to an alternative platform, such as Microsoft Power Apps.

When creating tables in Access web apps, you need to select a data type for each column of data. Data types in Access web apps are similar to those in desktop database (.accdb) files, but there are some differences because the data is actually stored in SQL Server. The following table shows the data types available for Access web apps and what kind of data they're suitable for. For SQL Server aficionados, we also list the SQL Server data types that they correspond to.

Data type	Subtype property setting	Description	Corresponding SQL Server data type
AutoNumber	n/a	Unique value generated by Access for each new record.	int
Short Text	n/a	Alphanumeric data, 1 to 4000 characters (default character limit is 255).	nvarchar with length from 1 to 4000
Long Text	n/a	Alphanumeric data, up to 2^30-1 bytes.	nvarchar(max)
Number	Whole Number (no decimal places)	Numeric data.	int
Number	Floating-point number (variable decimal places)	Numeric data.	double
Number	Fixed-point number (6 decimal places)	Numeric data.	decimal(28,6)
Date/Time	Date	Dates.	date
Date/Time	Time	Times.	time(3)
Date/Time	Date with Time	Dates and times.	datetime2(3)
Currency	n/a	Monetary data.	decimal(28,6)
Yes/No	n/a	Boolean (yes/no) data.	bit (default is false)
Hyperlink	n/a	A link address to a document or file on the Internet or on an intranet	nvarchar(max)
Image	n/a	Picture data.	Binary Image data varbinary(max), 2^31-1 bytes
Calculated	n/a	Results of an expression you create using data from one or more fields in the table.	Depends on the results of the expression.
Lookup	Value List	Uses the contents a value list to validate the contents of the field.	nvarchar(220)
Lookup	Other table or query	Uses the ID field of another table or query to validate the contents of the field.	int

Learn more about SQL Server Data Types.