Data types (Transact-SQL). 2 minutes to read.In this articleAPPLIES TO: SQL Server Azure SQL Database Azure SQL Data Warehouse Parallel Data WarehouseIn SQL Server, each column, local variable, expression, and parameter has a related data type.
In SQL Server, ROWVERSION and TIMESTAMP data types represent automatically generated binary numbers, unique within the database. ROWVERSION and TIMESTAMP are synonyms, ROWVERSION is available since SQL Server 2005, while TIMESTAMP is deprecated and will be removed in a future version of SQL Server. Jun 04, 2015 SQL Server – How to Calculate Length and Size of any field in a SQL Table. From my experience this comes very handy to calculate length and size especially for LOB data type columns (varchar, varbinary, text, image, nvarchar, and ntext) as they can store variable length data. So, unlike LEN function which only returns the number of.
A data type is an attribute that specifies the type of data that the object can hold: integer data, character data, monetary data, date and time data, binary strings, and so on.SQL Server supplies a set of system data types that define all the types of data that can be used with SQL Server. You can also define your own data types in Transact-SQL or the Microsoft.NET Framework. Alias data types are based on the system-supplied data types. For more information about alias data types, see.
User-defined types obtain their characteristics from the methods and operators of a class that you create by using one of the programming languages support by the.NET Framework.When two expressions that have different data types, collations, precision, scale, or length are combined by an operator, the characteristics of result are determined by the following:. The data type of the result is determined by applying the rules of data type precedence to the data types of the input expressions. For more information, see. The collation of the result is determined by the rules of collation precedence when the result data type is char, varchar, text, nchar, nvarchar, or ntext. For more information, see.
The precision, scale, and length of the result depend on the precision, scale, and length of the input expressions. For more information, see.SQL Server provides data type synonyms for ISO compatibility. For more information, see. Data type categoriesData types in SQL Server are organized into the following categories:Exact numericsUnicode character stringsApproximate numericsBinary stringsDate and timeOther data typesCharacter stringsIn SQL Server, based on their storage characteristics, some data types are designated as belonging to the following groups:.Large value data types: varchar(max), and nvarchar(max).Large object data types: text, ntext, image, varbinary(max), and xml.